Fix local server tests & exceptions tests

src/objective-c/tests/GRPCClientTests.m

@@ -292,15 +292,6 @@ static GRPCProtoMethod *kUnaryCallMethod;
 
 // TODO(makarandd): Move to a different file that contains only unit tests
 - (void)testExceptions {
-  // Try to set userAgentPrefix for host that is nil. This should cause
-  // an exception.
-  @try {
-    [GRPCCall setUserAgentPrefix:@"Foo" forHost:nil];
-    XCTFail(@"Did not receive an exception when host is nil");
-  } @catch(NSException *theException) {
-    NSLog(@"Received exception as expected: %@", theException.name);
-  }
-
   // Try to set parameters to nil for GRPCCall. This should cause an exception
   @try {
     (void)[[GRPCCall alloc] initWithHost:nil

src/objective-c/tests/InteropTests.h

@@ -46,4 +46,11 @@
  * Override in a subclass to perform these tests against a specific address.
  */
 + (NSString *)host;
+
+/**
+ * Bytes of overhead of test proto responses due to encoding. This is used to excercise the behavior
+ * when responses are just above or below the max response size. For some reason, the local and
+ * remote servers enconde responses with different overhead (?), so this is defined per-subclass.
+ */
+- (int32_t)encodingOverhead;
 @end

src/objective-c/tests/InteropTests.m

@@ -88,6 +88,10 @@
   return nil;
 }
 
+- (int32_t)encodingOverhead {
+  return 0;
+}
+
 - (void)setUp {
   self.continueAfterFailure = NO;
 
@@ -150,7 +154,7 @@
   __weak XCTestExpectation *expectation = [self expectationWithDescription:@"MaxResponseSize"];
 
   RMTSimpleRequest *request = [RMTSimpleRequest message];
-  const size_t kPayloadSize = 4 * 1024 * 1024 - 12; // 4MB - 12B of protobuf encoding overhead
+  const int32_t kPayloadSize = 4 * 1024 * 1024 - self.encodingOverhead; // 4MB - encoding overhead
   request.responseSize = kPayloadSize;
 
   [_service unaryCallWithRequest:request handler:^(RMTSimpleResponse *response, NSError *error) {
@@ -167,7 +171,7 @@
   __weak XCTestExpectation *expectation = [self expectationWithDescription:@"ResponseOverMaxSize"];
 
   RMTSimpleRequest *request = [RMTSimpleRequest message];
-  const size_t kPayloadSize = 4 * 1024 * 1024 - 11; // 1B over max size (see above test)
+  const int32_t kPayloadSize = 4 * 1024 * 1024 - self.encodingOverhead + 1; // 1B over max size
   request.responseSize = kPayloadSize;
 
   [_service unaryCallWithRequest:request handler:^(RMTSimpleResponse *response, NSError *error) {

src/objective-c/tests/InteropTestsLocalCleartext.m

@@ -47,6 +47,10 @@ static NSString * const kLocalCleartextHost = @"localhost:5050";
   return kLocalCleartextHost;
 }
 
+- (int32_t)encodingOverhead {
+  return 10; // bytes
+}
+
 - (void)setUp {
   [super setUp];
 

src/objective-c/tests/InteropTestsLocalSSL.m

@@ -47,6 +47,10 @@ static NSString * const kLocalSSLHost = @"localhost:5051";
   return kLocalSSLHost;
 }
 
+- (int32_t)encodingOverhead {
+  return 10; // bytes
+}
+
 - (void)setUp {
   [super setUp];
 

src/objective-c/tests/InteropTestsRemote.m

@@ -47,4 +47,8 @@ static NSString * const kRemoteSSLHost = @"grpc-test.sandbox.googleapis.com";
   return kRemoteSSLHost;
 }
 
+- (int32_t)encodingOverhead {
+  return 12; // bytes
+}
+
 @end

src/objective-c/tests/Tests.xcodeproj/xcshareddata/xcschemes/AllTests.xcscheme

@@ -38,12 +38,6 @@
                ReferencedContainer = "container:Tests.xcodeproj">
             </BuildableReference>
             <SkippedTests>
-               <Test
-                  Identifier = "GRPCClientTests/testConnectionToRemoteServer">
-               </Test>
-               <Test
-                  Identifier = "GRPCClientTests/testMetadata">
-               </Test>
                <Test
                   Identifier = "InteropTests">
                </Test>