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diff --git a/objectivec/Tests/GPBFilteredMessageTests.m b/objectivec/Tests/GPBFilteredMessageTests.m
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+++ b/objectivec/Tests/GPBFilteredMessageTests.m
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Tests our filter system for ObjC.
+// The proto being filtered is unittest_filter.proto.
+// The filter file is Filter.txt.
+
+#import "GPBTestUtilities.h"
+
+#import "google/protobuf/UnittestFilter.pbobjc.h"
+
+// If we get an error about this already being defined, it is most likely
+// because of an error in protoc which is supposed to be filtering
+// the Remove message.
+enum { Other_FieldNumber_B = 0 };
+
+@interface FilteredMessageTests : GPBTestCase
+@end
+
+@implementation FilteredMessageTests
+
+- (void)testEnumFiltering {
+  // If compile fails here it is because protoc did not generate KeepEnum.
+  XCTAssertTrue(KeepEnum_IsValidValue(KeepEnum_KeepValue));
+  XCTAssertNotNil(KeepEnum_EnumDescriptor());
+
+  // If compile fails here it is because protoc did not generate
+  // KeepEnumInsideEnum and is probably due to nested enum handling being
+  // broken.
+  XCTAssertTrue(RemoveEnumMessage_KeepEnumInside_IsValidValue(
+      RemoveEnumMessage_KeepEnumInside_KeepValue));
+  XCTAssertNotNil(RemoveEnumMessage_KeepEnumInside_EnumDescriptor());
+}
+
+- (void)testMessageFiltering {
+  // Messages that should be generated.
+  XCTAssertNil([UnittestFilterRoot extensionRegistry]);
+  XCTAssertNotNil([[[Keep alloc] init] autorelease]);
+  XCTAssertNotNil([[[Other alloc] init] autorelease]);
+  XCTAssertNotNil([[[RemoveJustKidding alloc] init] autorelease]);
+  XCTAssertNotNil(
+      [[[RemoveEnumMessage_KeepNestedInside alloc] init] autorelease]);
+
+  // Messages that should not be generated
+  XCTAssertNil(NSClassFromString(@"Remove"));
+  XCTAssertNil(NSClassFromString(@"RemoveEnumMessage"));
+  XCTAssertNil(NSClassFromString(@"RemoveEnumMessage_RemoveNestedInside"));
+
+  // These should all fail compile if protoc is bad.
+  XCTAssertTrue([Other instancesRespondToSelector:@selector(hasA)]);
+  XCTAssertTrue([Other instancesRespondToSelector:@selector(setHasA:)]);
+  XCTAssertTrue([Other instancesRespondToSelector:@selector(a)]);
+  XCTAssertTrue([Other instancesRespondToSelector:@selector(setA:)]);
+
+  // These the compiler should not generate.
+  XCTAssertFalse(
+      [Other instancesRespondToSelector:NSSelectorFromString(@"hasB")]);
+  XCTAssertFalse(
+      [Other instancesRespondToSelector:NSSelectorFromString(@"setHasB:")]);
+  XCTAssertFalse([Other instancesRespondToSelector:NSSelectorFromString(@"b")]);
+  XCTAssertFalse(
+      [Other instancesRespondToSelector:NSSelectorFromString(@"setB:")]);
+
+  // This should fail if protoc filters it.
+  XCTAssertEqual(Other_FieldNumber_A, 1);
+
+  // Make sure the definition at the top of the file is providing the value.
+  XCTAssertEqual(Other_FieldNumber_B, 0);
+}
+
+@end