restore sane repeat count and timeout for objC tests (#30897)

src/objective-c/tests/Common/TestUtils.m

@@ -26,10 +26,10 @@
 #define NSStringize(x) @NSStringize_helper(x)
 
 // Default test flake repeat counts
-static const NSUInteger kGRPCDefaultTestFlakeRepeats = 2;
+static const NSUInteger kGRPCDefaultTestFlakeRepeats = 1;
 
 // Default interop local test timeout.
-const NSTimeInterval GRPCInteropTestTimeoutDefault = 3.0;
+const NSTimeInterval GRPCInteropTestTimeoutDefault = 15.0;
 
 NSString *GRPCGetLocalInteropTestServerAddressPlainText() {
   static NSString *address;
@@ -126,6 +126,10 @@ BOOL GRPCTestRunWithFlakeRepeats(XCTestCase *testCase, GRPCTestRunBlock testBloc
     if (result == XCTWaiterResultCompleted && assertionSuccess) {
       return YES;
     }
+
+    if (!isLastRun) {
+      NSLog(@"test attempt %@ failed, will retry.", NSStringize(runs));
+    }
     runs += 1;
   }
 

tools/internal_ci/macos/grpc_objc_bazel_test.sh

@@ -91,6 +91,12 @@ INTEROP_SERVER_BINARY=bazel-bin/test/cpp/interop/interop_server
 trap 'echo "KILLING interop_server binaries running on the background"; kill -9 $(jobs -p)' EXIT
 # === END SECTION: run interop_server on the background ====
 
+# Environment variables that will be visible to objc tests.
+OBJC_TEST_ENV_ARGS=(
+  --test_env=HOST_PORT_LOCAL=localhost:$PLAIN_PORT
+  --test_env=HOST_PORT_LOCALSSL=localhost:$TLS_PORT
+)
+
 python3 tools/run_tests/python_utils/bazel_report_helper.py --report_path objc_bazel_tests
 
 # NOTE: When using bazel to run the tests, test env variables like GRPC_VERBOSITY or GRPC_TRACE
@@ -103,9 +109,7 @@ objc_bazel_tests/bazel_wrapper \
   --google_credentials="${KOKORO_GFILE_DIR}/GrpcTesting-d0eeee2db331.json" \
   "${BAZEL_REMOTE_CACHE_ARGS[@]}" \
   $BAZEL_FLAGS \
-  --test_env HOST_PORT_LOCAL=localhost:$PLAIN_PORT \
-  --test_env HOST_PORT_LOCALSSL=localhost:$TLS_PORT \
-  --test_env FLAKE_TEST_REPEATS=3 \
+  "${OBJC_TEST_ENV_ARGS[@]}" \
   -- \
   "${EXAMPLE_TARGETS[@]}" \
   "${TEST_TARGETS[@]}"