3 files changed, 88 insertions, 9 deletions

diff --git a/test/core/channel/channel_trace_test.cc b/test/core/channel/channel_trace_test.cc
index 99d9a4847f..f224457a55 100644
--- a/test/core/channel/channel_trace_test.cc
+++ b/test/core/channel/channel_trace_test.cc
@@ -187,8 +187,8 @@ TEST_P(ChannelTracerTest, ComplexTest) {
   AddSimpleTrace(&tracer);
   AddSimpleTrace(&tracer);
   AddSimpleTrace(&tracer);
-  sc1.reset(nullptr);
-  sc2.reset(nullptr);
+  sc1.reset();
+  sc2.reset();
 }
 
 // Test a case in which the parent channel has subchannels and the subchannels
@@ -234,9 +234,9 @@ TEST_P(ChannelTracerTest, TestNesting) {
       grpc_slice_from_static_string("subchannel one inactive"), sc1);
   AddSimpleTrace(&tracer);
   ValidateChannelTrace(&tracer, 8, GetParam());
-  sc1.reset(nullptr);
-  sc2.reset(nullptr);
-  conn1.reset(nullptr);
+  sc1.reset();
+  sc2.reset();
+  conn1.reset();
 }
 
 INSTANTIATE_TEST_CASE_P(ChannelTracerTestSweep, ChannelTracerTest,
diff --git a/test/core/gprpp/ref_counted_ptr_test.cc b/test/core/gprpp/ref_counted_ptr_test.cc
index aa30b72282..463b5e8966 100644
--- a/test/core/gprpp/ref_counted_ptr_test.cc
+++ b/test/core/gprpp/ref_counted_ptr_test.cc
@@ -127,7 +127,7 @@ TEST(RefCountedPtr, ResetFromNonNullToNull) {
 TEST(RefCountedPtr, ResetFromNullToNull) {
   RefCountedPtr<Foo> foo;
   EXPECT_EQ(nullptr, foo.get());
-  foo.reset(nullptr);
+  foo.reset();
   EXPECT_EQ(nullptr, foo.get());
 }
 
@@ -175,6 +175,67 @@ TEST(RefCountedPtr, RefCountedWithTracing) {
   foo->Unref(DEBUG_LOCATION, "foo");
 }
 
+class BaseClass : public RefCounted<BaseClass> {
+ public:
+  BaseClass() {}
+};
+
+class Subclass : public BaseClass {
+ public:
+  Subclass() {}
+};
+
+TEST(RefCountedPtr, ConstructFromSubclass) {
+  RefCountedPtr<BaseClass> p(New<Subclass>());
+}
+
+TEST(RefCountedPtr, CopyAssignFromSubclass) {
+  RefCountedPtr<BaseClass> b;
+  EXPECT_EQ(nullptr, b.get());
+  RefCountedPtr<Subclass> s = MakeRefCounted<Subclass>();
+  b = s;
+  EXPECT_NE(nullptr, b.get());
+}
+
+TEST(RefCountedPtr, MoveAssignFromSubclass) {
+  RefCountedPtr<BaseClass> b;
+  EXPECT_EQ(nullptr, b.get());
+  RefCountedPtr<Subclass> s = MakeRefCounted<Subclass>();
+  b = std::move(s);
+  EXPECT_NE(nullptr, b.get());
+}
+
+TEST(RefCountedPtr, ResetFromSubclass) {
+  RefCountedPtr<BaseClass> b;
+  EXPECT_EQ(nullptr, b.get());
+  b.reset(New<Subclass>());
+  EXPECT_NE(nullptr, b.get());
+}
+
+TEST(RefCountedPtr, EqualityWithSubclass) {
+  Subclass* s = New<Subclass>();
+  RefCountedPtr<BaseClass> b(s);
+  EXPECT_EQ(b, s);
+}
+
+void FunctionTakingBaseClass(RefCountedPtr<BaseClass> p) {
+  p.reset();  // To appease clang-tidy.
+}
+
+TEST(RefCountedPtr, CanPassSubclassToFunctionExpectingBaseClass) {
+  RefCountedPtr<Subclass> p = MakeRefCounted<Subclass>();
+  FunctionTakingBaseClass(p);
+}
+
+void FunctionTakingSubclass(RefCountedPtr<Subclass> p) {
+  p.reset();  // To appease clang-tidy.
+}
+
+TEST(RefCountedPtr, CanPassSubclassToFunctionExpectingSubclass) {
+  RefCountedPtr<Subclass> p = MakeRefCounted<Subclass>();
+  FunctionTakingSubclass(p);
+}
+
 }  // namespace
 }  // namespace testing
 }  // namespace grpc_core
diff --git a/test/cpp/qps/client.h b/test/cpp/qps/client.h
index 9d58ea8882..9d7469c9b5 100644
--- a/test/cpp/qps/client.h
+++ b/test/cpp/qps/client.h
@@ -19,6 +19,8 @@
 #ifndef TEST_QPS_CLIENT_H
 #define TEST_QPS_CLIENT_H
 
+#include <stdlib.h>
+
 #include <condition_variable>
 #include <mutex>
 #include <unordered_map>
@@ -34,6 +36,7 @@
 #include "src/proto/grpc/testing/benchmark_service.grpc.pb.h"
 #include "src/proto/grpc/testing/payloads.pb.h"
 
+#include "src/core/lib/gpr/env.h"
 #include "src/cpp/util/core_stats.h"
 #include "test/cpp/qps/histogram.h"
 #include "test/cpp/qps/interarrival.h"
@@ -441,9 +444,24 @@ class ClientImpl : public Client {
     std::unique_ptr<std::thread> WaitForReady() {
       return std::unique_ptr<std::thread>(new std::thread([this]() {
         if (!is_inproc_) {
-          GPR_ASSERT(channel_->WaitForConnected(
-              gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
-                           gpr_time_from_seconds(10, GPR_TIMESPAN))));
+          int connect_deadline = 10;
+          /* Allow optionally overriding connect_deadline in order
+           * to deal with benchmark environments in which the server
+           * can take a long time to become ready. */
+          char* channel_connect_timeout_str =
+              gpr_getenv("QPS_WORKER_CHANNEL_CONNECT_TIMEOUT");
+          if (channel_connect_timeout_str != nullptr &&
+              strcmp(channel_connect_timeout_str, "") != 0) {
+            connect_deadline = atoi(channel_connect_timeout_str);
+          }
+          gpr_log(GPR_INFO,
+                  "Waiting for up to %d seconds for the channel %p to connect",
+                  connect_deadline, channel_.get());
+          gpr_free(channel_connect_timeout_str);
+          GPR_ASSERT(channel_->WaitForConnected(gpr_time_add(
+              gpr_now(GPR_CLOCK_REALTIME),
+              gpr_time_from_seconds(connect_deadline, GPR_TIMESPAN))));
+          gpr_log(GPR_INFO, "Channel %p connected!", channel_.get());
         }
       }));
     }