Enable clang-tidy as a sanity check, fix up all known failures

4 files changed, 0 insertions, 1405 deletions

diff --git a/test/core/statistics/census_log_tests.cc b/test/core/statistics/census_log_tests.cc
deleted file mode 100644
index e6eda5486c..0000000000
--- a/test/core/statistics/census_log_tests.cc
+++ /dev/null
@@ -1,576 +0,0 @@
-/*
- *
- * Copyright 2015 gRPC authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-#include <grpc/support/cpu.h>
-#include <grpc/support/log.h>
-#include <grpc/support/port_platform.h>
-#include <grpc/support/sync.h>
-#include <grpc/support/thd.h>
-#include <grpc/support/time.h>
-#include <grpc/support/useful.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include "src/core/ext/census/census_log.h"
-#include "test/core/util/test_config.h"
-
-/* Fills in 'record' of size 'size'. Each byte in record is filled in with the
-   same value. The value is extracted from 'record' pointer. */
-static void write_record(char* record, size_t size) {
-  char data = (uintptr_t)record % 255;
-  memset(record, data, size);
-}
-
-/* Reads fixed size records. Returns the number of records read in
-   'num_records'. */
-static void read_records(size_t record_size, const char* buffer,
-                         size_t buffer_size, int32_t* num_records) {
-  int32_t ix;
-  GPR_ASSERT(buffer_size >= record_size);
-  GPR_ASSERT(buffer_size % record_size == 0);
-  *num_records = buffer_size / record_size;
-  for (ix = 0; ix < *num_records; ++ix) {
-    size_t jx;
-    const char* record = buffer + (record_size * ix);
-    char data = (uintptr_t)record % 255;
-    for (jx = 0; jx < record_size; ++jx) {
-      GPR_ASSERT(data == record[jx]);
-    }
-  }
-}
-
-/* Tries to write the specified number of records. Stops when the log gets
-   full. Returns the number of records written. Spins for random
-   number of times, up to 'max_spin_count', between writes. */
-static size_t write_records_to_log(int writer_id, int32_t record_size,
-                                   int32_t num_records,
-                                   int32_t max_spin_count) {
-  int32_t ix;
-  int counter = 0;
-  for (ix = 0; ix < num_records; ++ix) {
-    int32_t jx;
-    int32_t spin_count = max_spin_count ? rand() % max_spin_count : 0;
-    char* record;
-    if (counter++ == num_records / 10) {
-      printf("   Writer %d: %d out of %d written\n", writer_id, ix,
-             num_records);
-      counter = 0;
-    }
-    record = (char*)(census_log_start_write(record_size));
-    if (record == NULL) {
-      return ix;
-    }
-    write_record(record, record_size);
-    census_log_end_write(record, record_size);
-    for (jx = 0; jx < spin_count; ++jx) {
-      GPR_ASSERT(jx >= 0);
-    }
-  }
-  return num_records;
-}
-
-/* Performs a single read iteration. Returns the number of records read. */
-static size_t perform_read_iteration(size_t record_size) {
-  const void* read_buffer = NULL;
-  size_t bytes_available;
-  size_t records_read = 0;
-  census_log_init_reader();
-  while ((read_buffer = census_log_read_next(&bytes_available))) {
-    int32_t num_records = 0;
-    read_records(record_size, (const char*)read_buffer, bytes_available,
-                 &num_records);
-    records_read += num_records;
-  }
-  return records_read;
-}
-
-/* Asserts that the log is empty. */
-static void assert_log_empty(void) {
-  size_t bytes_available;
-  census_log_init_reader();
-  GPR_ASSERT(census_log_read_next(&bytes_available) == NULL);
-}
-
-/* Given log size and record size, computes the minimum usable space. */
-static int32_t min_usable_space(size_t log_size, size_t record_size) {
-  int32_t usable_space;
-  int32_t num_blocks =
-      GPR_MAX(log_size / CENSUS_LOG_MAX_RECORD_SIZE, gpr_cpu_num_cores());
-  int32_t waste_per_block = CENSUS_LOG_MAX_RECORD_SIZE % record_size;
-  /* In the worst case, all except one core-local block is full. */
-  int32_t num_full_blocks = num_blocks - 1;
-  usable_space = (int32_t)log_size -
-                 (num_full_blocks * CENSUS_LOG_MAX_RECORD_SIZE) -
-                 ((num_blocks - num_full_blocks) * waste_per_block);
-  GPR_ASSERT(usable_space > 0);
-  return usable_space;
-}
-
-/* Fills the log and verifies data. If 'no fragmentation' is true, records
-   are sized such that CENSUS_LOG_2_MAX_RECORD_SIZE is a multiple of record
-   size. If not a circular log, verifies that the number of records written
-   match the number of records read. */
-static void fill_log(size_t log_size, int no_fragmentation, int circular_log) {
-  int size;
-  int32_t records_written;
-  int32_t usable_space;
-  int32_t records_read;
-  if (no_fragmentation) {
-    int log2size = rand() % (CENSUS_LOG_2_MAX_RECORD_SIZE + 1);
-    size = (1 << log2size);
-  } else {
-    while (1) {
-      size = 1 + (rand() % CENSUS_LOG_MAX_RECORD_SIZE);
-      if (CENSUS_LOG_MAX_RECORD_SIZE % size) {
-        break;
-      }
-    }
-  }
-  printf("   Fill record size: %d\n", size);
-  records_written = write_records_to_log(
-      0 /* writer id */, size, (log_size / size) * 2, 0 /* spin count */);
-  usable_space = min_usable_space(log_size, size);
-  GPR_ASSERT(records_written * size >= usable_space);
-  records_read = perform_read_iteration(size);
-  if (!circular_log) {
-    GPR_ASSERT(records_written == records_read);
-  }
-  assert_log_empty();
-}
-
-/* Structure to pass args to writer_thread */
-typedef struct writer_thread_args {
-  /* Index of this thread in the writers vector. */
-  int index;
-  /* Record size. */
-  size_t record_size;
-  /* Number of records to write. */
-  int32_t num_records;
-  /* Used to signal when writer is complete */
-  gpr_cv* done;
-  gpr_mu* mu;
-  int* count;
-} writer_thread_args;
-
-/* Writes the given number of records of random size (up to kMaxRecordSize) and
-   random data to the specified log. */
-static void writer_thread(void* arg) {
-  writer_thread_args* args = (writer_thread_args*)arg;
-  /* Maximum number of times to spin between writes. */
-  static const int32_t MAX_SPIN_COUNT = 50;
-  int records_written = 0;
-  printf("   Writer: %d\n", args->index);
-  while (records_written < args->num_records) {
-    records_written += write_records_to_log(args->index, args->record_size,
-                                            args->num_records - records_written,
-                                            MAX_SPIN_COUNT);
-    if (records_written < args->num_records) {
-      /* Ran out of log space. Sleep for a bit and let the reader catch up.
-         This should never happen for circular logs. */
-      printf("   Writer stalled due to out-of-space: %d out of %d written\n",
-             records_written, args->num_records);
-      gpr_sleep_until(grpc_timeout_milliseconds_to_deadline(10));
-    }
-  }
-  /* Done. Decrement count and signal. */
-  gpr_mu_lock(args->mu);
-  (*args->count)--;
-  gpr_cv_broadcast(args->done);
-  printf("   Writer done: %d\n", args->index);
-  gpr_mu_unlock(args->mu);
-}
-
-/* struct to pass args to reader_thread */
-typedef struct reader_thread_args {
-  /* Record size. */
-  size_t record_size;
-  /* Interval between read iterations. */
-  int32_t read_iteration_interval_in_msec;
-  /* Total number of records. */
-  int32_t total_records;
-  /* Signalled when reader should stop. */
-  gpr_cv stop;
-  int stop_flag;
-  /* Used to signal when reader has finished */
-  gpr_cv* done;
-  gpr_mu* mu;
-  int running;
-} reader_thread_args;
-
-/* Reads and verifies the specified number of records. Reader can also be
-   stopped via gpr_cv_signal(&args->stop). Sleeps for 'read_interval_in_msec'
-   between read iterations. */
-static void reader_thread(void* arg) {
-  int32_t records_read = 0;
-  reader_thread_args* args = (reader_thread_args*)arg;
-  int32_t num_iterations = 0;
-  gpr_timespec interval;
-  int counter = 0;
-  printf("   Reader starting\n");
-  interval = gpr_time_from_micros(
-      (int64_t)args->read_iteration_interval_in_msec * 1000, GPR_TIMESPAN);
-  gpr_mu_lock(args->mu);
-  while (!args->stop_flag && records_read < args->total_records) {
-    gpr_cv_wait(&args->stop, args->mu, interval);
-    if (!args->stop_flag) {
-      records_read += perform_read_iteration(args->record_size);
-      GPR_ASSERT(records_read <= args->total_records);
-      if (counter++ == 100000) {
-        printf("   Reader: %d out of %d read\n", records_read,
-               args->total_records);
-        counter = 0;
-      }
-      ++num_iterations;
-    }
-  }
-  /* Done */
-  args->running = 0;
-  gpr_cv_broadcast(args->done);
-  printf("   Reader: records: %d, iterations: %d\n", records_read,
-         num_iterations);
-  gpr_mu_unlock(args->mu);
-}
-
-/* Creates NUM_WRITERS writers where each writer writes NUM_RECORDS_PER_WRITER
-   records. Also, starts a reader that iterates over and reads blocks every
-   READ_ITERATION_INTERVAL_IN_MSEC. */
-/* Number of writers. */
-#define NUM_WRITERS 5
-static void multiple_writers_single_reader(int circular_log) {
-  /* Sleep interval between read iterations. */
-  static const int32_t READ_ITERATION_INTERVAL_IN_MSEC = 10;
-  /* Number of records written by each writer. */
-  static const int32_t NUM_RECORDS_PER_WRITER = 10 * 1024 * 1024;
-  /* Maximum record size. */
-  static const size_t MAX_RECORD_SIZE = 10;
-  int ix;
-  gpr_thd_id id;
-  gpr_cv writers_done;
-  int writers_count = NUM_WRITERS;
-  gpr_mu writers_mu; /* protects writers_done and writers_count */
-  writer_thread_args writers[NUM_WRITERS];
-  gpr_cv reader_done;
-  gpr_mu reader_mu; /* protects reader_done and reader.running */
-  reader_thread_args reader;
-  int32_t record_size = 1 + rand() % MAX_RECORD_SIZE;
-  printf("   Record size: %d\n", record_size);
-  /* Create and start writers. */
-  gpr_cv_init(&writers_done);
-  gpr_mu_init(&writers_mu);
-  for (ix = 0; ix < NUM_WRITERS; ++ix) {
-    writers[ix].index = ix;
-    writers[ix].record_size = record_size;
-    writers[ix].num_records = NUM_RECORDS_PER_WRITER;
-    writers[ix].done = &writers_done;
-    writers[ix].count = &writers_count;
-    writers[ix].mu = &writers_mu;
-    gpr_thd_new(&id, &writer_thread, &writers[ix], NULL);
-  }
-  /* Start reader. */
-  reader.record_size = record_size;
-  reader.read_iteration_interval_in_msec = READ_ITERATION_INTERVAL_IN_MSEC;
-  reader.total_records = NUM_WRITERS * NUM_RECORDS_PER_WRITER;
-  reader.stop_flag = 0;
-  gpr_cv_init(&reader.stop);
-  gpr_cv_init(&reader_done);
-  reader.done = &reader_done;
-  gpr_mu_init(&reader_mu);
-  reader.mu = &reader_mu;
-  reader.running = 1;
-  gpr_thd_new(&id, &reader_thread, &reader, NULL);
-  /* Wait for writers to finish. */
-  gpr_mu_lock(&writers_mu);
-  while (writers_count != 0) {
-    gpr_cv_wait(&writers_done, &writers_mu, gpr_inf_future(GPR_CLOCK_REALTIME));
-  }
-  gpr_mu_unlock(&writers_mu);
-  gpr_mu_destroy(&writers_mu);
-  gpr_cv_destroy(&writers_done);
-  gpr_mu_lock(&reader_mu);
-  if (circular_log) {
-    /* Stop reader. */
-    reader.stop_flag = 1;
-    gpr_cv_signal(&reader.stop);
-  }
-  /* wait for reader to finish */
-  while (reader.running) {
-    gpr_cv_wait(&reader_done, &reader_mu, gpr_inf_future(GPR_CLOCK_REALTIME));
-  }
-  if (circular_log) {
-    /* Assert that there were no out-of-space errors. */
-    GPR_ASSERT(0 == census_log_out_of_space_count());
-  }
-  gpr_mu_unlock(&reader_mu);
-  gpr_mu_destroy(&reader_mu);
-  gpr_cv_destroy(&reader_done);
-  printf("   Reader: finished\n");
-}
-
-/* Log sizes to use for all tests. */
-#define LOG_SIZE_IN_MB 1
-#define LOG_SIZE_IN_BYTES (LOG_SIZE_IN_MB << 20)
-
-static void setup_test(int circular_log) {
-  census_log_initialize(LOG_SIZE_IN_MB, circular_log);
-  GPR_ASSERT(census_log_remaining_space() == LOG_SIZE_IN_BYTES);
-}
-
-/* Attempts to create a record of invalid size (size >
-   CENSUS_LOG_MAX_RECORD_SIZE). */
-void test_invalid_record_size(void) {
-  static const size_t INVALID_SIZE = CENSUS_LOG_MAX_RECORD_SIZE + 1;
-  static const size_t VALID_SIZE = 1;
-  void* record;
-  printf("Starting test: invalid record size\n");
-  setup_test(0);
-  record = census_log_start_write(INVALID_SIZE);
-  GPR_ASSERT(record == NULL);
-  /* Now try writing a valid record. */
-  record = census_log_start_write(VALID_SIZE);
-  GPR_ASSERT(record != NULL);
-  census_log_end_write(record, VALID_SIZE);
-  /* Verifies that available space went down by one block. In theory, this
-     check can fail if the thread is context switched to a new CPU during the
-     start_write execution (multiple blocks get allocated), but this has not
-     been observed in practice. */
-  GPR_ASSERT(LOG_SIZE_IN_BYTES - CENSUS_LOG_MAX_RECORD_SIZE ==
-             census_log_remaining_space());
-  census_log_shutdown();
-}
-
-/* Tests end_write() with a different size than what was specified in
-   start_write(). */
-void test_end_write_with_different_size(void) {
-  static const size_t START_WRITE_SIZE = 10;
-  static const size_t END_WRITE_SIZE = 7;
-  void* record_written;
-  const void* record_read;
-  size_t bytes_available;
-  printf("Starting test: end write with different size\n");
-  setup_test(0);
-  record_written = census_log_start_write(START_WRITE_SIZE);
-  GPR_ASSERT(record_written != NULL);
-  census_log_end_write(record_written, END_WRITE_SIZE);
-  census_log_init_reader();
-  record_read = census_log_read_next(&bytes_available);
-  GPR_ASSERT(record_written == record_read);
-  GPR_ASSERT(END_WRITE_SIZE == bytes_available);
-  assert_log_empty();
-  census_log_shutdown();
-}
-
-/* Verifies that pending records are not available via read_next(). */
-void test_read_pending_record(void) {
-  static const size_t PR_RECORD_SIZE = 1024;
-  size_t bytes_available;
-  const void* record_read;
-  void* record_written;
-  printf("Starting test: read pending record\n");
-  setup_test(0);
-  /* Start a write. */
-  record_written = census_log_start_write(PR_RECORD_SIZE);
-  GPR_ASSERT(record_written != NULL);
-  /* As write is pending, read should fail. */
-  census_log_init_reader();
-  record_read = census_log_read_next(&bytes_available);
-  GPR_ASSERT(record_read == NULL);
-  /* A read followed by end_write() should succeed. */
-  census_log_end_write(record_written, PR_RECORD_SIZE);
-  census_log_init_reader();
-  record_read = census_log_read_next(&bytes_available);
-  GPR_ASSERT(record_written == record_read);
-  GPR_ASSERT(PR_RECORD_SIZE == bytes_available);
-  assert_log_empty();
-  census_log_shutdown();
-}
-
-/* Tries reading beyond pending write. */
-void test_read_beyond_pending_record(void) {
-  /* Start a write. */
-  uint32_t incomplete_record_size = 10;
-  uint32_t complete_record_size = 20;
-  size_t bytes_available;
-  void* complete_record;
-  const void* record_read;
-  void* incomplete_record;
-  printf("Starting test: read beyond pending record\n");
-  setup_test(0);
-  incomplete_record = census_log_start_write(incomplete_record_size);
-  GPR_ASSERT(incomplete_record != NULL);
-  complete_record = census_log_start_write(complete_record_size);
-  GPR_ASSERT(complete_record != NULL);
-  GPR_ASSERT(complete_record != incomplete_record);
-  census_log_end_write(complete_record, complete_record_size);
-  /* Now iterate over blocks to read completed records. */
-  census_log_init_reader();
-  record_read = census_log_read_next(&bytes_available);
-  GPR_ASSERT(complete_record == record_read);
-  GPR_ASSERT(complete_record_size == bytes_available);
-  /* Complete first record. */
-  census_log_end_write(incomplete_record, incomplete_record_size);
-  /* Have read past the incomplete record, so read_next() should return NULL. */
-  /* NB: this test also assumes our thread did not get switched to a different
-     CPU between the two start_write calls */
-  record_read = census_log_read_next(&bytes_available);
-  GPR_ASSERT(record_read == NULL);
-  /* Reset reader to get the newly completed record. */
-  census_log_init_reader();
-  record_read = census_log_read_next(&bytes_available);
-  GPR_ASSERT(incomplete_record == record_read);
-  GPR_ASSERT(incomplete_record_size == bytes_available);
-  assert_log_empty();
-  census_log_shutdown();
-}
-
-/* Tests scenario where block being read is detached from a core and put on the
-   dirty list. */
-void test_detached_while_reading(void) {
-  static const size_t DWR_RECORD_SIZE = 10;
-  size_t bytes_available;
-  const void* record_read;
-  void* record_written;
-  uint32_t block_read = 0;
-  printf("Starting test: detached while reading\n");
-  setup_test(0);
-  /* Start a write. */
-  record_written = census_log_start_write(DWR_RECORD_SIZE);
-  GPR_ASSERT(record_written != NULL);
-  census_log_end_write(record_written, DWR_RECORD_SIZE);
-  /* Read this record. */
-  census_log_init_reader();
-  record_read = census_log_read_next(&bytes_available);
-  GPR_ASSERT(record_read != NULL);
-  GPR_ASSERT(DWR_RECORD_SIZE == bytes_available);
-  /* Now fill the log. This will move the block being read from core-local
-     array to the dirty list. */
-  while ((record_written = census_log_start_write(DWR_RECORD_SIZE))) {
-    census_log_end_write(record_written, DWR_RECORD_SIZE);
-  }
-
-  /* In this iteration, read_next() should only traverse blocks in the
-     core-local array. Therefore, we expect at most gpr_cpu_num_cores() more
-     blocks. As log is full, if read_next() is traversing the dirty list, we
-     will get more than gpr_cpu_num_cores() blocks. */
-  while ((record_read = census_log_read_next(&bytes_available))) {
-    ++block_read;
-    GPR_ASSERT(block_read <= gpr_cpu_num_cores());
-  }
-  census_log_shutdown();
-}
-
-/* Fills non-circular log with records sized such that size is a multiple of
-   CENSUS_LOG_MAX_RECORD_SIZE (no per-block fragmentation). */
-void test_fill_log_no_fragmentation(void) {
-  const int circular = 0;
-  printf("Starting test: fill log no fragmentation\n");
-  setup_test(circular);
-  fill_log(LOG_SIZE_IN_BYTES, 1 /* no fragmentation */, circular);
-  census_log_shutdown();
-}
-
-/* Fills circular log with records sized such that size is a multiple of
-   CENSUS_LOG_MAX_RECORD_SIZE (no per-block fragmentation). */
-void test_fill_circular_log_no_fragmentation(void) {
-  const int circular = 1;
-  printf("Starting test: fill circular log no fragmentation\n");
-  setup_test(circular);
-  fill_log(LOG_SIZE_IN_BYTES, 1 /* no fragmentation */, circular);
-  census_log_shutdown();
-}
-
-/* Fills non-circular log with records that may straddle end of a block. */
-void test_fill_log_with_straddling_records(void) {
-  const int circular = 0;
-  printf("Starting test: fill log with straddling records\n");
-  setup_test(circular);
-  fill_log(LOG_SIZE_IN_BYTES, 0 /* block straddling records */, circular);
-  census_log_shutdown();
-}
-
-/* Fills circular log with records that may straddle end of a block. */
-void test_fill_circular_log_with_straddling_records(void) {
-  const int circular = 1;
-  printf("Starting test: fill circular log with straddling records\n");
-  setup_test(circular);
-  fill_log(LOG_SIZE_IN_BYTES, 0 /* block straddling records */, circular);
-  census_log_shutdown();
-}
-
-/* Tests scenario where multiple writers and a single reader are using a log
-   that is configured to discard old records. */
-void test_multiple_writers_circular_log(void) {
-  const int circular = 1;
-  printf("Starting test: multiple writers circular log\n");
-  setup_test(circular);
-  multiple_writers_single_reader(circular);
-  census_log_shutdown();
-}
-
-/* Tests scenario where multiple writers and a single reader are using a log
-   that is configured to discard old records. */
-void test_multiple_writers(void) {
-  const int circular = 0;
-  printf("Starting test: multiple writers\n");
-  setup_test(circular);
-  multiple_writers_single_reader(circular);
-  census_log_shutdown();
-}
-
-/* Repeat the straddling records and multiple writers tests with a small log. */
-void test_small_log(void) {
-  size_t log_size;
-  const int circular = 0;
-  printf("Starting test: small log\n");
-  census_log_initialize(0, circular);
-  log_size = census_log_remaining_space();
-  GPR_ASSERT(log_size > 0);
-  fill_log(log_size, 0, circular);
-  census_log_shutdown();
-  census_log_initialize(0, circular);
-  multiple_writers_single_reader(circular);
-  census_log_shutdown();
-}
-
-void test_performance(void) {
-  int write_size = 1;
-  for (; write_size < CENSUS_LOG_MAX_RECORD_SIZE; write_size *= 2) {
-    gpr_timespec write_time;
-    gpr_timespec start_time;
-    double write_time_micro = 0.0;
-    int nrecords = 0;
-    setup_test(0);
-    start_time = gpr_now(GPR_CLOCK_REALTIME);
-    while (1) {
-      void* record = census_log_start_write(write_size);
-      if (record == NULL) {
-        break;
-      }
-      census_log_end_write(record, write_size);
-      nrecords++;
-    }
-    write_time = gpr_time_sub(gpr_now(GPR_CLOCK_REALTIME), start_time);
-    write_time_micro = write_time.tv_sec * 1000000 + write_time.tv_nsec / 1000;
-    census_log_shutdown();
-    printf(
-        "Wrote %d %d byte records in %.3g microseconds: %g records/us "
-        "(%g ns/record), %g gigabytes/s\n",
-        nrecords, write_size, write_time_micro, nrecords / write_time_micro,
-        1000 * write_time_micro / nrecords,
-        (write_size * nrecords) / write_time_micro / 1000);
-  }
-}
diff --git a/test/core/statistics/hash_table_test.cc b/test/core/statistics/hash_table_test.cc
deleted file mode 100644
index b660006b8a..0000000000
--- a/test/core/statistics/hash_table_test.cc
+++ /dev/null
@@ -1,286 +0,0 @@
-/*
- *
- * Copyright 2015 gRPC authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "src/core/ext/census/hash_table.h"
-
-#include <grpc/support/alloc.h>
-#include <grpc/support/log.h>
-#include <grpc/support/time.h>
-#include "src/core/lib/support/murmur_hash.h"
-#include "src/core/lib/support/string.h"
-#include "test/core/util/test_config.h"
-
-static uint64_t hash64(const void* k) {
-  size_t len = strlen(k);
-  uint64_t higher = gpr_murmur_hash3((const char*)k, len / 2, 0);
-  return higher << 32 |
-         gpr_murmur_hash3((const char*)(k) + len / 2, len - len / 2, 0);
-}
-
-static int cmp_str_keys(const void* k1, const void* k2) {
-  return strcmp((const char*)k1, (const char*)k2);
-}
-
-static uint64_t force_collision(const void* k) {
-  return (1997 + hash64(k) % 3);
-}
-
-static void free_data(void* data) { gpr_free(data); }
-
-/* Basic tests that empty hash table can be created and destroyed. */
-static void test_create_table(void) {
-  /* Create table with uint64 key type */
-  census_ht* ht = NULL;
-  census_ht_option ht_options = {
-      CENSUS_HT_UINT64, 1999, NULL, NULL, NULL, NULL};
-  ht = census_ht_create(&ht_options);
-  GPR_ASSERT(ht != NULL);
-  GPR_ASSERT(census_ht_get_size(ht) == 0);
-  census_ht_destroy(ht);
-  /* Create table with pointer key type */
-  ht = NULL;
-  ht_options.key_type = CENSUS_HT_POINTER;
-  ht_options.hash = &hash64;
-  ht_options.compare_keys = &cmp_str_keys;
-  ht = census_ht_create(&ht_options);
-  GPR_ASSERT(ht != NULL);
-  GPR_ASSERT(census_ht_get_size(ht) == 0);
-  census_ht_destroy(ht);
-}
-
-static void test_table_with_int_key(void) {
-  census_ht_option opt = {CENSUS_HT_UINT64, 7, NULL, NULL, NULL, NULL};
-  census_ht* ht = census_ht_create(&opt);
-  uint64_t i = 0;
-  uint64_t sum_of_keys = 0;
-  size_t num_elements;
-  census_ht_kv* elements = NULL;
-  GPR_ASSERT(ht != NULL);
-  GPR_ASSERT(census_ht_get_size(ht) == 0);
-  elements = census_ht_get_all_elements(ht, &num_elements);
-  GPR_ASSERT(num_elements == 0);
-  GPR_ASSERT(elements == NULL);
-  for (i = 0; i < 20; ++i) {
-    census_ht_key key;
-    key.val = i;
-    census_ht_insert(ht, key, (void*)(intptr_t)i);
-    GPR_ASSERT(census_ht_get_size(ht) == i + 1);
-  }
-  for (i = 0; i < 20; i++) {
-    uint64_t* val = NULL;
-    census_ht_key key;
-    key.val = i;
-    val = static_cast<uint64_t*>(census_ht_find(ht, key));
-    GPR_ASSERT(val == (void*)(intptr_t)i);
-  }
-  elements = census_ht_get_all_elements(ht, &num_elements);
-  GPR_ASSERT(elements != NULL);
-  GPR_ASSERT(num_elements == 20);
-  for (i = 0; i < num_elements; i++) {
-    sum_of_keys += elements[i].k.val;
-  }
-  GPR_ASSERT(sum_of_keys == 190);
-  gpr_free(elements);
-  census_ht_destroy(ht);
-}
-
-/* Test that there is no memory leak when keys and values are owned by table. */
-static void test_value_and_key_deleter(void) {
-  census_ht_option opt = {CENSUS_HT_POINTER, 7,          &hash64,
-                          &cmp_str_keys,     &free_data, &free_data};
-  census_ht* ht = census_ht_create(&opt);
-  census_ht_key key;
-  char* val = NULL;
-  char* val2 = NULL;
-  key.ptr = gpr_malloc(100);
-  val = static_cast<char*>(gpr_malloc(10));
-  strcpy(val, "value");
-  strcpy(key.ptr, "some string as a key");
-  GPR_ASSERT(ht != NULL);
-  GPR_ASSERT(census_ht_get_size(ht) == 0);
-  census_ht_insert(ht, key, val);
-  GPR_ASSERT(census_ht_get_size(ht) == 1);
-  val = static_cast<char*>(census_ht_find(ht, key));
-  GPR_ASSERT(val != NULL);
-  GPR_ASSERT(strcmp(val, "value") == 0);
-  /* Insert same key different value, old value is overwritten. */
-  val2 = static_cast<char*>(gpr_malloc(10));
-  strcpy(val2, "v2");
-  census_ht_insert(ht, key, val2);
-  GPR_ASSERT(census_ht_get_size(ht) == 1);
-  val2 = static_cast<char*>(census_ht_find(ht, key));
-  GPR_ASSERT(val2 != NULL);
-  GPR_ASSERT(strcmp(val2, "v2") == 0);
-  census_ht_destroy(ht);
-}
-
-/* Test simple insert and erase operations. */
-static void test_simple_add_and_erase(void) {
-  census_ht_option opt = {CENSUS_HT_UINT64, 7, NULL, NULL, NULL, NULL};
-  census_ht* ht = census_ht_create(&opt);
-  GPR_ASSERT(ht != NULL);
-  GPR_ASSERT(census_ht_get_size(ht) == 0);
-  {
-    census_ht_key key;
-    int val = 3;
-    key.val = 2;
-    census_ht_insert(ht, key, (void*)&val);
-    GPR_ASSERT(census_ht_get_size(ht) == 1);
-    census_ht_erase(ht, key);
-    GPR_ASSERT(census_ht_get_size(ht) == 0);
-    /* Erasing a key from an empty table should be noop. */
-    census_ht_erase(ht, key);
-    GPR_ASSERT(census_ht_get_size(ht) == 0);
-    /* Erasing a non-existant key from a table should be noop. */
-    census_ht_insert(ht, key, (void*)&val);
-    key.val = 3;
-    census_ht_insert(ht, key, (void*)&val);
-    key.val = 9;
-    census_ht_insert(ht, key, (void*)&val);
-    GPR_ASSERT(census_ht_get_size(ht) == 3);
-    key.val = 1;
-    census_ht_erase(ht, key);
-    /* size unchanged after deleting non-existant key. */
-    GPR_ASSERT(census_ht_get_size(ht) == 3);
-    /* size decrease by 1 after deleting an existant key. */
-    key.val = 2;
-    census_ht_erase(ht, key);
-    GPR_ASSERT(census_ht_get_size(ht) == 2);
-  }
-  census_ht_destroy(ht);
-}
-
-static void test_insertion_and_deletion_with_high_collision_rate(void) {
-  census_ht_option opt = {CENSUS_HT_POINTER, 13,   &force_collision,
-                          &cmp_str_keys,     NULL, NULL};
-  census_ht* ht = census_ht_create(&opt);
-  char key_str[1000][GPR_LTOA_MIN_BUFSIZE];
-  uint64_t val = 0;
-  unsigned i = 0;
-  for (i = 0; i < 1000; i++) {
-    census_ht_key key;
-    key.ptr = key_str[i];
-    gpr_ltoa(i, key_str[i]);
-    census_ht_insert(ht, key, (void*)(&val));
-    gpr_log(GPR_INFO, "%d\n", i);
-    GPR_ASSERT(census_ht_get_size(ht) == (i + 1));
-  }
-  for (i = 0; i < 1000; i++) {
-    census_ht_key key;
-    key.ptr = key_str[i];
-    census_ht_erase(ht, key);
-    GPR_ASSERT(census_ht_get_size(ht) == (999 - i));
-  }
-  census_ht_destroy(ht);
-}
-
-static void test_table_with_string_key(void) {
-  census_ht_option opt = {CENSUS_HT_POINTER, 7,    &hash64,
-                          &cmp_str_keys,     NULL, NULL};
-  census_ht* ht = census_ht_create(&opt);
-  const char* keys[] = {
-      "k1", "a",   "000", "apple", "banana_a_long_long_long_banana",
-      "%$", "111", "foo", "b"};
-  const int vals[] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
-  int i = 0;
-  GPR_ASSERT(ht != NULL);
-  GPR_ASSERT(census_ht_get_size(ht) == 0);
-  for (i = 0; i < 9; i++) {
-    census_ht_key key;
-    key.ptr = (void*)(keys[i]);
-    census_ht_insert(ht, key, (void*)(vals + i));
-  }
-  GPR_ASSERT(census_ht_get_size(ht) == 9);
-  for (i = 0; i < 9; i++) {
-    census_ht_key key;
-    int* val_ptr;
-    key.ptr = (void*)(keys[i]);
-    val_ptr = static_cast<int*>(census_ht_find(ht, key));
-    GPR_ASSERT(*val_ptr == vals[i]);
-  }
-  {
-    /* inserts duplicate keys */
-    census_ht_key key;
-    int* val_ptr = NULL;
-    key.ptr = (void*)(keys[2]);
-    census_ht_insert(ht, key, (void*)(vals + 8));
-    /* expect value to be over written by new insertion */
-    GPR_ASSERT(census_ht_get_size(ht) == 9);
-    val_ptr = static_cast<int*>(census_ht_find(ht, key));
-    GPR_ASSERT(*val_ptr == vals[8]);
-  }
-  for (i = 0; i < 9; i++) {
-    census_ht_key key;
-    int* val_ptr;
-    uint32_t expected_tbl_sz = 9 - i;
-    GPR_ASSERT(census_ht_get_size(ht) == expected_tbl_sz);
-    key.ptr = (void*)(keys[i]);
-    val_ptr = static_cast<int*>(census_ht_find(ht, key));
-    GPR_ASSERT(val_ptr != NULL);
-    census_ht_erase(ht, key);
-    GPR_ASSERT(census_ht_get_size(ht) == expected_tbl_sz - 1);
-    val_ptr = static_cast<int*>(census_ht_find(ht, key));
-    GPR_ASSERT(val_ptr == NULL);
-  }
-  census_ht_destroy(ht);
-}
-
-static void test_insertion_with_same_key(void) {
-  census_ht_option opt = {CENSUS_HT_UINT64, 11, NULL, NULL, NULL, NULL};
-  census_ht* ht = census_ht_create(&opt);
-  census_ht_key key;
-  const char vals[] = {'a', 'b', 'c'};
-  char* val_ptr;
-  key.val = 3;
-  census_ht_insert(ht, key, (void*)&(vals[0]));
-  GPR_ASSERT(census_ht_get_size(ht) == 1);
-  val_ptr = (char*)census_ht_find(ht, key);
-  GPR_ASSERT(val_ptr != NULL);
-  GPR_ASSERT(*val_ptr == 'a');
-  key.val = 4;
-  val_ptr = (char*)census_ht_find(ht, key);
-  GPR_ASSERT(val_ptr == NULL);
-  key.val = 3;
-  census_ht_insert(ht, key, (void*)&(vals[1]));
-  GPR_ASSERT(census_ht_get_size(ht) == 1);
-  val_ptr = (char*)census_ht_find(ht, key);
-  GPR_ASSERT(val_ptr != NULL);
-  GPR_ASSERT(*val_ptr == 'b');
-  census_ht_insert(ht, key, (void*)&(vals[2]));
-  GPR_ASSERT(census_ht_get_size(ht) == 1);
-  val_ptr = (char*)census_ht_find(ht, key);
-  GPR_ASSERT(val_ptr != NULL);
-  GPR_ASSERT(*val_ptr == 'c');
-  census_ht_destroy(ht);
-}
-
-int main(int argc, char** argv) {
-  grpc_test_init(argc, argv);
-  test_create_table();
-  test_simple_add_and_erase();
-  test_table_with_int_key();
-  test_table_with_string_key();
-  test_value_and_key_deleter();
-  test_insertion_with_same_key();
-  test_insertion_and_deletion_with_high_collision_rate();
-  return 0;
-}
diff --git a/test/core/statistics/trace_test.cc b/test/core/statistics/trace_test.cc
deleted file mode 100644
index ecbfed09ee..0000000000
--- a/test/core/statistics/trace_test.cc
+++ /dev/null
@@ -1,239 +0,0 @@
-/*
- *
- * Copyright 2015 gRPC authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-#include <stdio.h>
-#include <string.h>
-
-#include <grpc/support/alloc.h>
-#include <grpc/support/log.h>
-#include <grpc/support/port_platform.h>
-#include <grpc/support/sync.h>
-#include <grpc/support/thd.h>
-#include <grpc/support/time.h>
-#include <grpc/support/useful.h>
-#include "src/core/ext/census/census_interface.h"
-#include "src/core/ext/census/census_tracing.h"
-#include "test/core/util/test_config.h"
-
-/* Ensure all possible state transitions are called without causing problem */
-static void test_init_shutdown(void) {
-  census_tracing_init();
-  census_tracing_init();
-  census_tracing_shutdown();
-  census_tracing_shutdown();
-  census_tracing_init();
-}
-
-static void test_start_op_generates_locally_unique_ids(void) {
-/* Check that ids generated within window size of 1000 are unique.
-   TODO(hongyu): Replace O(n^2) duplicate detection algorithm with O(nlogn)
-   algorithm. Enhance the test to larger window size (>10^6) */
-#define WINDOW_SIZE 1000
-  census_op_id ids[WINDOW_SIZE];
-  int i;
-  census_init();
-  for (i = 0; i < WINDOW_SIZE; i++) {
-    ids[i] = census_tracing_start_op();
-    census_tracing_end_op(ids[i]);
-  }
-  for (i = 0; i < WINDOW_SIZE - 1; i++) {
-    int j;
-    for (j = i + 1; j < WINDOW_SIZE; j++) {
-      GPR_ASSERT(ids[i].upper != ids[j].upper || ids[i].lower != ids[j].lower);
-    }
-  }
-#undef WINDOW_SIZE
-  census_shutdown();
-}
-
-static void test_get_trace_method_name(void) {
-  census_op_id id;
-  const char write_name[] = "service/method";
-  census_tracing_init();
-  id = census_tracing_start_op();
-  census_add_method_tag(id, write_name);
-  census_internal_lock_trace_store();
-  {
-    const char* read_name =
-        census_get_trace_method_name(census_get_trace_obj_locked(id));
-    GPR_ASSERT(strcmp(read_name, write_name) == 0);
-  }
-  census_internal_unlock_trace_store();
-  census_tracing_shutdown();
-}
-
-typedef struct thd_arg {
-  int num_done;
-  gpr_cv done;
-  gpr_mu mu;
-} thd_arg;
-
-static void mimic_trace_op_sequences(void* arg) {
-  census_op_id id;
-  const char* method_name = "service_foo/method_bar";
-  int i = 0;
-  const int num_iter = 200;
-  thd_arg* args = (thd_arg*)arg;
-  GPR_ASSERT(args != NULL);
-  gpr_log(GPR_INFO, "Start trace op sequence thread.");
-  for (i = 0; i < num_iter; i++) {
-    id = census_tracing_start_op();
-    census_add_method_tag(id, method_name);
-    /* pretend doing 1us work. */
-    gpr_sleep_until(GRPC_TIMEOUT_MICROS_TO_DEADLINE(1));
-    census_tracing_end_op(id);
-  }
-  gpr_log(GPR_INFO, "End trace op sequence thread.");
-  gpr_mu_lock(&args->mu);
-  args->num_done += 1;
-  gpr_cv_broadcast(&args->done);
-  gpr_mu_unlock(&args->mu);
-}
-
-static void test_concurrency(void) {
-#define NUM_THREADS 1000
-  gpr_thd_id tid[NUM_THREADS];
-  int i = 0;
-  thd_arg arg;
-  arg.num_done = 0;
-  gpr_mu_init(&arg.mu);
-  gpr_cv_init(&arg.done);
-  census_tracing_init();
-  for (i = 0; i < NUM_THREADS; ++i) {
-    gpr_thd_new(tid + i, mimic_trace_op_sequences, &arg, NULL);
-  }
-  gpr_mu_lock(&arg.mu);
-  while (arg.num_done < NUM_THREADS) {
-    gpr_log(GPR_INFO, "num done %d", arg.num_done);
-    gpr_cv_wait(&arg.done, &arg.mu, gpr_inf_future(GPR_CLOCK_REALTIME));
-  }
-  gpr_mu_unlock(&arg.mu);
-  census_tracing_shutdown();
-#undef NUM_THREADS
-}
-
-static void test_add_method_tag_to_unknown_op_id(void) {
-  census_op_id unknown_id = {0xDEAD, 0xBEEF};
-  int ret = 0;
-  census_tracing_init();
-  ret = census_add_method_tag(unknown_id, "foo");
-  GPR_ASSERT(ret != 0);
-  census_tracing_shutdown();
-}
-
-static void test_trace_print(void) {
-  census_op_id id;
-  int i;
-  const char* annotation_txt[4] = {"abc", "", "$%^ *()_"};
-  char long_txt[CENSUS_MAX_ANNOTATION_LENGTH + 10];
-
-  memset(long_txt, 'a', GPR_ARRAY_SIZE(long_txt));
-  long_txt[CENSUS_MAX_ANNOTATION_LENGTH + 9] = '\0';
-  annotation_txt[3] = long_txt;
-
-  census_tracing_init();
-  id = census_tracing_start_op();
-  /* Adds large number of annotations to each trace */
-  for (i = 0; i < 1000; i++) {
-    census_tracing_print(id,
-                         annotation_txt[i % GPR_ARRAY_SIZE(annotation_txt)]);
-  }
-  census_tracing_end_op(id);
-
-  census_tracing_shutdown();
-}
-
-/* Returns 1 if two ids are equal, otherwise returns 0. */
-static int ids_equal(census_op_id id1, census_op_id id2) {
-  return (id1.upper == id2.upper) && (id1.lower == id2.lower);
-}
-
-static void test_get_active_ops(void) {
-  census_op_id id_1, id_2, id_3;
-  census_trace_obj** active_ops;
-  const char* annotation_txt[] = {"annotation 1", "a2"};
-  int i = 0;
-  int n = 0;
-
-  gpr_log(GPR_INFO, "test_get_active_ops");
-  census_tracing_init();
-  /* No active ops before calling start_op(). */
-  active_ops = census_get_active_ops(&n);
-  GPR_ASSERT(active_ops == NULL);
-  GPR_ASSERT(n == 0);
-
-  /* Starts one op */
-  id_1 = census_tracing_start_op();
-  census_add_method_tag(id_1, "foo_1");
-  active_ops = census_get_active_ops(&n);
-  GPR_ASSERT(active_ops != NULL);
-  GPR_ASSERT(n == 1);
-  GPR_ASSERT(ids_equal(active_ops[0]->id, id_1));
-  census_trace_obj_destroy(active_ops[0]);
-  gpr_free(active_ops);
-  active_ops = NULL;
-
-  /* Start the second and the third ops */
-  id_2 = census_tracing_start_op();
-  census_add_method_tag(id_2, "foo_2");
-  id_3 = census_tracing_start_op();
-  census_add_method_tag(id_3, "foo_3");
-
-  active_ops = census_get_active_ops(&n);
-  GPR_ASSERT(n == 3);
-  for (i = 0; i < 3; i++) {
-    census_trace_obj_destroy(active_ops[i]);
-  }
-  gpr_free(active_ops);
-  active_ops = NULL;
-
-  /* End the second op  and add annotations to the third ops */
-  census_tracing_end_op(id_2);
-  census_tracing_print(id_3, annotation_txt[0]);
-  census_tracing_print(id_3, annotation_txt[1]);
-
-  active_ops = census_get_active_ops(&n);
-  GPR_ASSERT(active_ops != NULL);
-  GPR_ASSERT(n == 2);
-  for (i = 0; i < 2; i++) {
-    census_trace_obj_destroy(active_ops[i]);
-  }
-  gpr_free(active_ops);
-  active_ops = NULL;
-
-  /* End all ops. */
-  census_tracing_end_op(id_1);
-  census_tracing_end_op(id_3);
-  active_ops = census_get_active_ops(&n);
-  GPR_ASSERT(active_ops == NULL);
-  GPR_ASSERT(n == 0);
-
-  census_tracing_shutdown();
-}
-
-int main(int argc, char** argv) {
-  grpc_test_init(argc, argv);
-  test_init_shutdown();
-  test_start_op_generates_locally_unique_ids();
-  test_get_trace_method_name();
-  test_concurrency();
-  test_add_method_tag_to_unknown_op_id();
-  test_trace_print();
-  test_get_active_ops();
-  return 0;
-}
diff --git a/test/core/statistics/window_stats_test.cc b/test/core/statistics/window_stats_test.cc
deleted file mode 100644
index b17c61a47b..0000000000
--- a/test/core/statistics/window_stats_test.cc
+++ /dev/null
@@ -1,304 +0,0 @@
-/*
- *
- * Copyright 2015 gRPC authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-#include "src/core/ext/census/window_stats.h"
-#include <grpc/support/log.h>
-#include <grpc/support/time.h>
-#include <stdlib.h>
-#include "test/core/util/test_config.h"
-
-typedef struct test_stat {
-  double value1;
-  int value2;
-} test_stat;
-
-void add_test_stat(void* base, const void* addme) {
-  test_stat* b = (test_stat*)base;
-  const test_stat* a = (const test_stat*)addme;
-  b->value1 += a->value1;
-  b->value2 += a->value2;
-}
-
-void add_proportion_test_stat(double p, void* base, const void* addme) {
-  test_stat* b = (test_stat*)base;
-  const test_stat* a = (const test_stat*)addme;
-  b->value1 += p * a->value1;
-  b->value2 += p * a->value2 + 0.5; /* +0.5 is poor mans (no c99) round() */
-}
-
-const struct census_window_stats_stat_info kMyStatInfo = {
-    sizeof(test_stat), NULL, add_test_stat, add_proportion_test_stat};
-
-const gpr_timespec kMilliSecInterval = {0, 1000000, GPR_CLOCK_MONOTONIC};
-const gpr_timespec kSecInterval = {1, 0, GPR_CLOCK_MONOTONIC};
-const gpr_timespec kMinInterval = {60, 0 GPR_CLOCK_MONOTONIC};
-const gpr_timespec kHourInterval = {3600, 0, GPR_CLOCK_MONOTONIC};
-const gpr_timespec kPrimeInterval = {0, 101, GPR_CLOCK_MONOTONIC};
-
-static int compare_double(double a, double b, double epsilon) {
-  if (a >= b) {
-    return (a > b + epsilon) ? 1 : 0;
-  } else {
-    return (b > a + epsilon) ? -1 : 0;
-  }
-}
-
-void empty_test(void) {
-  census_window_stats_sums result;
-  const gpr_timespec zero = {0, 0, GPR_CLOCK_MONOTONIC};
-  test_stat sum;
-  struct census_window_stats* stats =
-      census_window_stats_create(1, &kMinInterval, 5, &kMyStatInfo);
-  GPR_ASSERT(stats != NULL);
-  result.statistic = &sum;
-  census_window_stats_get_sums(stats, zero, &result);
-  GPR_ASSERT(result.count == 0 && sum.value1 == 0 && sum.value2 == 0);
-  census_window_stats_get_sums(stats, gpr_now(GPR_CLOCK_REALTIME), &result);
-  GPR_ASSERT(result.count == 0 && sum.value1 == 0 && sum.value2 == 0);
-  census_window_stats_destroy(stats);
-}
-
-void one_interval_test(void) {
-  const test_stat value = {0.1, 4};
-  const double epsilon = 1e10 - 11;
-  gpr_timespec when = {0, 0, GPR_CLOCK_MONOTONIC};
-  census_window_stats_sums result;
-  test_stat sum;
-  /* granularity == 5 so width of internal windows should be 12s */
-  struct census_window_stats* stats =
-      census_window_stats_create(1, &kMinInterval, 5, &kMyStatInfo);
-  GPR_ASSERT(stats != NULL);
-  /* phase 1: insert a single value at t=0s, and check that various measurement
-     times result in expected output values */
-  census_window_stats_add(stats, when, &value);
-  result.statistic = &sum;
-  /* when = 0s, values extracted should be everything */
-  census_window_stats_get_sums(stats, when, &result);
-  GPR_ASSERT(compare_double(result.count, 1, epsilon) == 0 &&
-             compare_double(sum.value1, value.value1, epsilon) == 0 &&
-             sum.value2 == value.value2);
-  /* when = 6,30,60s, should be all of the data */
-  when.tv_sec = 6;
-  census_window_stats_get_sums(stats, when, &result);
-  GPR_ASSERT(compare_double(result.count, 1.0, epsilon) == 0 &&
-             compare_double(sum.value1, value.value1, epsilon) == 0 &&
-             sum.value2 == value.value2);
-  /* when == 30s,60s, should be all of the data */
-  when.tv_sec = 30;
-  census_window_stats_get_sums(stats, when, &result);
-  GPR_ASSERT(compare_double(result.count, 1.0, epsilon) == 0 &&
-             compare_double(sum.value1, value.value1, epsilon) == 0 &&
-             sum.value2 == value.value2);
-  when.tv_sec = 60;
-  census_window_stats_get_sums(stats, when, &result);
-  GPR_ASSERT(compare_double(result.count, 1.0, epsilon) == 0 &&
-             compare_double(sum.value1, value.value1, epsilon) == 0 &&
-             sum.value2 == value.value2);
-  /* when = 66s, should be half (only take half of bottom bucket) */
-  when.tv_sec = 66;
-  census_window_stats_get_sums(stats, when, &result);
-  GPR_ASSERT(compare_double(result.count, 0.5, epsilon) == 0 &&
-             compare_double(sum.value1, value.value1 / 2, epsilon) == 0 &&
-             sum.value2 == value.value2 / 2);
-  /* when = 72s, should be completely out of window */
-  when.tv_sec = 72;
-  census_window_stats_get_sums(stats, when, &result);
-  GPR_ASSERT(compare_double(result.count, 0, epsilon) == 0 &&
-             compare_double(sum.value1, 0, epsilon) == 0 && sum.value2 == 0);
-
-  /* phase 2: tear down and do as before, but inserting two values */
-  census_window_stats_destroy(stats);
-  stats = census_window_stats_create(1, &kMinInterval, 5, &kMyStatInfo);
-  GPR_ASSERT(stats != NULL);
-  when.tv_sec = 0;
-  when.tv_nsec = 17;
-  census_window_stats_add(stats, when, &value);
-  when.tv_sec = 1;
-  census_window_stats_add(stats, when, &value);
-  when.tv_sec = 0;
-  census_window_stats_get_sums(stats, when, &result);
-  GPR_ASSERT(compare_double(result.count, 0, epsilon) == 0 &&
-             compare_double(sum.value1, 0, epsilon) == 0 && sum.value2 == 0);
-  /* time = 3s, 30s, should get all data */
-  when.tv_sec = 3;
-  census_window_stats_get_sums(stats, when, &result);
-  GPR_ASSERT(compare_double(result.count, 2, epsilon) == 0 &&
-             compare_double(sum.value1, 2 * value.value1, epsilon) == 0 &&
-             sum.value2 == 2 * value.value2);
-  when.tv_sec = 30;
-  census_window_stats_get_sums(stats, when, &result);
-  GPR_ASSERT(compare_double(result.count, 2, epsilon) == 0 &&
-             compare_double(sum.value1, 2 * value.value1, epsilon) == 0 &&
-             sum.value2 == 2 * value.value2);
-
-  /* phase 3: insert into "middle" bucket, and force a shift, pushing out
-     the two values in bottom bucket */
-  when.tv_sec = 30;
-  census_window_stats_add(stats, when, &value);
-  when.tv_sec = 76;
-  census_window_stats_add(stats, when, &value);
-  when.tv_sec = 0;
-  census_window_stats_get_sums(stats, when, &result);
-  GPR_ASSERT(result.count == 0 && sum.value1 == 0 && sum.value2 == 0);
-  when.tv_sec = 30;
-  census_window_stats_get_sums(stats, when, &result);
-  /* half of the single value in the 30 second bucket */
-  GPR_ASSERT(compare_double(result.count, 0.5, epsilon) == 0 &&
-             compare_double(sum.value1, value.value1 / 2, epsilon) == 0 &&
-             sum.value2 == value.value2 / 2);
-  when.tv_sec = 74;
-  census_window_stats_get_sums(stats, when, &result);
-  /* half of the 76 second bucket, all of the 30 second bucket */
-  GPR_ASSERT(compare_double(result.count, 1.5, epsilon) == 0 &&
-             compare_double(sum.value1, value.value1 * 1.5, epsilon) == 0 &&
-             sum.value2 == value.value2 / 2 * 3);
-  when.tv_sec = 76;
-  census_window_stats_get_sums(stats, when, &result);
-  /* >=76s, get all of the 76 second bucket, all of the 30 second bucket */
-  GPR_ASSERT(compare_double(result.count, 2, epsilon) == 0 &&
-             compare_double(sum.value1, value.value1 * 2, epsilon) == 0 &&
-             sum.value2 == value.value2 * 2);
-  when.tv_sec = 78;
-  census_window_stats_get_sums(stats, when, &result);
-  /* half of the 76 second bucket, all of the 30 second bucket */
-  GPR_ASSERT(compare_double(result.count, 2, epsilon) == 0 &&
-             compare_double(sum.value1, value.value1 * 2, epsilon) == 0 &&
-             sum.value2 == value.value2 * 2);
-  census_window_stats_destroy(stats);
-}
-
-void many_interval_test(void) {
-  gpr_timespec intervals[4];
-  const test_stat value = {123.45, 8};
-  const double epsilon = 1e10 - 11;
-  gpr_timespec when = {3600, 0, GPR_CLOCK_MONOTONIC}; /* one hour */
-  census_window_stats_sums result[4];
-  test_stat sums[4];
-  int i;
-  struct census_window_stats* stats;
-  intervals[0] = kMilliSecInterval;
-  intervals[1] = kSecInterval;
-  intervals[2] = kMinInterval;
-  intervals[3] = kHourInterval;
-  for (i = 0; i < 4; i++) {
-    result[i].statistic = &sums[i];
-  }
-  stats = census_window_stats_create(4, intervals, 100, &kMyStatInfo);
-  GPR_ASSERT(stats != NULL);
-  /* add 10 stats within half of each time range */
-  for (i = 0; i < 10; i++) {
-    when.tv_sec += 180; /* covers 30 min of one hour range */
-    census_window_stats_add(stats, when, &value);
-  }
-  when.tv_sec += 120;
-  for (i = 0; i < 10; i++) {
-    when.tv_sec += 3; /* covers 30 sec of one minute range */
-    census_window_stats_add(stats, when, &value);
-  }
-  when.tv_sec += 2;
-  for (i = 0; i < 10; i++) {
-    when.tv_nsec += 50000000; /* covers 0.5s of 1s range */
-    census_window_stats_add(stats, when, &value);
-  }
-  when.tv_nsec += 2000000;
-  for (i = 0; i < 10; i++) {
-    when.tv_nsec += 50000; /* covers 0.5 ms of 1 ms range */
-    census_window_stats_add(stats, when, &value);
-  }
-  when.tv_nsec += 20000;
-  census_window_stats_get_sums(stats, when, result);
-  GPR_ASSERT(compare_double(result[0].count, 10, epsilon) == 0 &&
-             compare_double(sums[0].value1, value.value1 * 10, epsilon) == 0 &&
-             sums[0].value2 == value.value2 * 10);
-  when.tv_nsec += 20000000;
-  census_window_stats_get_sums(stats, when, result);
-  GPR_ASSERT(compare_double(result[1].count, 20, epsilon) == 0 &&
-             compare_double(sums[1].value1, value.value1 * 20, epsilon) == 0 &&
-             sums[1].value2 == value.value2 * 20);
-  when.tv_sec += 2;
-  census_window_stats_get_sums(stats, when, result);
-  GPR_ASSERT(compare_double(result[2].count, 30, epsilon) == 0 &&
-             compare_double(sums[2].value1, value.value1 * 30, epsilon) == 0 &&
-             sums[2].value2 == value.value2 * 30);
-  when.tv_sec += 72;
-  census_window_stats_get_sums(stats, when, result);
-  GPR_ASSERT(compare_double(result[3].count, 40, epsilon) == 0 &&
-             compare_double(sums[3].value1, value.value1 * 40, epsilon) == 0 &&
-             sums[3].value2 == value.value2 * 40);
-  census_window_stats_destroy(stats);
-}
-
-void rolling_time_test(void) {
-  const test_stat value = {0.1, 4};
-  gpr_timespec when = {0, 0, GPR_CLOCK_MONOTONIC};
-  census_window_stats_sums result;
-  test_stat sum;
-  int i;
-  gpr_timespec increment = {0, 0, GPR_CLOCK_MONOTONIC};
-  struct census_window_stats* stats =
-      census_window_stats_create(1, &kMinInterval, 7, &kMyStatInfo);
-  GPR_ASSERT(stats != NULL);
-  srand(gpr_now(GPR_CLOCK_REALTIME).tv_nsec);
-  for (i = 0; i < 100000; i++) {
-    increment.tv_nsec = rand() % 100000000; /* up to 1/10th second */
-    when = gpr_time_add(when, increment);
-    census_window_stats_add(stats, when, &value);
-  }
-  result.statistic = &sum;
-  census_window_stats_get_sums(stats, when, &result);
-  /* With 1/20th second average between samples, we expect 20*60 = 1200
-     samples on average. Make sure we are within 100 of that. */
-  GPR_ASSERT(compare_double(result.count, 1200, 100) == 0);
-  census_window_stats_destroy(stats);
-}
-
-#include <stdio.h>
-void infinite_interval_test(void) {
-  const test_stat value = {0.1, 4};
-  gpr_timespec when = {0, 0, GPR_CLOCK_MONOTONIC};
-  census_window_stats_sums result;
-  test_stat sum;
-  int i;
-  const int count = 100000;
-  gpr_timespec increment = {0, 0, GPR_CLOCK_MONOTONIC};
-  gpr_timespec temp = gpr_inf_future(GPR_CLOCK_REALTIME);
-  struct census_window_stats* stats = census_window_stats_create(
-      1, &gpr_inf_future(GPR_CLOCK_REALTIME), 10, &kMyStatInfo);
-  srand(gpr_now(GPR_CLOCK_REALTIME).tv_nsec);
-  for (i = 0; i < count; i++) {
-    increment.tv_sec = rand() % 21600; /* 6 hours */
-    when = gpr_time_add(when, increment);
-    census_window_stats_add(stats, when, &value);
-  }
-  result.statistic = &sum;
-  census_window_stats_get_sums(stats, when, &result);
-  /* The only thing it makes sense to compare for "infinite" periods is the
-     total counts */
-  GPR_ASSERT(result.count == count);
-  census_window_stats_destroy(stats);
-}
-
-int main(int argc, char* argv[]) {
-  grpc_test_init(argc, argv);
-  empty_test();
-  one_interval_test();
-  many_interval_test();
-  rolling_time_test();
-  infinite_interval_test();
-  return 0;
-}