1 files changed, 73 insertions, 0 deletions
diff --git a/test/core/gpr/murmur_hash_test.cc b/test/core/gpr/murmur_hash_test.cc
new file mode 100644
index 0000000000..d920dd3f95
--- /dev/null
+++ b/test/core/gpr/murmur_hash_test.cc
@@ -0,0 +1,73 @@
+/*
+ *
+ * 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/lib/gpr/murmur_hash.h"
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+#include "test/core/util/test_config.h"
+
+#include <string.h>
+
+typedef uint32_t (*hash_func)(const void* key, size_t len, uint32_t seed);
+
+/* From smhasher:
+   This should hopefully be a thorough and uambiguous test of whether a hash
+   is correctly implemented on a given platform */
+
+static void verification_test(hash_func hash, uint32_t expected) {
+  uint8_t key[256];
+  uint32_t hashes[256];
+  uint32_t final = 0;
+  size_t i;
+
+  memset(key, 0, sizeof(key));
+  memset(hashes, 0, sizeof(hashes));
+
+  /* Hash keys of the form {0}, {0,1}, {0,1,2}... up to N=255,using 256-N as
+     the seed */
+
+  for (i = 0; i < 256; i++) {
+    key[i] = (uint8_t)i;
+    hashes[i] = hash(key, i, (uint32_t)(256u - i));
+  }
+
+  /* Then hash the result array */
+
+  final = hash(hashes, sizeof(hashes), 0);
+
+  /* The first four bytes of that hash, interpreted as a little-endian integer,
+     is our
+     verification value */
+
+  if (expected != final) {
+    gpr_log(GPR_INFO, "Verification value 0x%08X : Failed! (Expected 0x%08x)",
+            final, expected);
+    abort();
+  } else {
+    gpr_log(GPR_INFO, "Verification value 0x%08X : Passed!", final);
+  }
+}
+
+int main(int argc, char** argv) {
+  grpc_test_init(argc, argv);
+  /* basic tests to verify that things don't crash */
+  gpr_murmur_hash3("", 0, 0);
+  gpr_murmur_hash3("xyz", 3, 0);
+  verification_test(gpr_murmur_hash3, 0xB0F57EE3);
+  return 0;
+}