Added tests, supporting c-ares as well as std resolver.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6e9ed42..c98db00 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -227,6 +227,7 @@
 add_dependencies(buildtests_c concurrent_connectivity_test)
 add_dependencies(buildtests_c connection_refused_test)
 add_dependencies(buildtests_c dns_resolver_connectivity_test)
+add_dependencies(buildtests_c dns_resolver_cooldown_test)
 add_dependencies(buildtests_c dns_resolver_test)
 if(_gRPC_PLATFORM_LINUX OR _gRPC_PLATFORM_MAC OR _gRPC_PLATFORM_POSIX)
 add_dependencies(buildtests_c dualstack_socket_test)
@@ -5258,6 +5259,33 @@
 endif (gRPC_BUILD_TESTS)
 if (gRPC_BUILD_TESTS)
 
+add_executable(dns_resolver_cooldown_test
+  test/core/client_channel/resolvers/dns_resolver_cooldown_test.cc
+)
+
+
+target_include_directories(dns_resolver_cooldown_test
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include
+  PRIVATE ${_gRPC_SSL_INCLUDE_DIR}
+  PRIVATE ${_gRPC_PROTOBUF_INCLUDE_DIR}
+  PRIVATE ${_gRPC_ZLIB_INCLUDE_DIR}
+  PRIVATE ${_gRPC_BENCHMARK_INCLUDE_DIR}
+  PRIVATE ${_gRPC_CARES_INCLUDE_DIR}
+  PRIVATE ${_gRPC_GFLAGS_INCLUDE_DIR}
+)
+
+target_link_libraries(dns_resolver_cooldown_test
+  ${_gRPC_ALLTARGETS_LIBRARIES}
+  grpc_test_util
+  grpc
+  gpr_test_util
+  gpr
+)
+
+endif (gRPC_BUILD_TESTS)
+if (gRPC_BUILD_TESTS)
+
 add_executable(dns_resolver_test
   test/core/client_channel/resolvers/dns_resolver_test.cc
 )