Improves the error message for leaked mocks to include the test name (by Zhanyong Wan).

include/gmock/internal/gmock-port.h

@@ -166,16 +166,16 @@ inline To down_cast(From* f) {  // so we only accept pointers
   return static_cast<To>(f);
 }
 
-// The GMOCK_COMPILE_ASSERT macro can be used to verify that a compile time
+// The GMOCK_COMPILE_ASSERT_ macro can be used to verify that a compile time
 // expression is true. For example, you could use it to verify the
 // size of a static array:
 //
-//   GMOCK_COMPILE_ASSERT(ARRAYSIZE(content_type_names) == CONTENT_NUM_TYPES,
-//                        content_type_names_incorrect_size);
+//   GMOCK_COMPILE_ASSERT_(ARRAYSIZE(content_type_names) == CONTENT_NUM_TYPES,
+//                         content_type_names_incorrect_size);
 //
 // or to make sure a struct is smaller than a certain size:
 //
-//   GMOCK_COMPILE_ASSERT(sizeof(foo) < 128, foo_too_large);
+//   GMOCK_COMPILE_ASSERT_(sizeof(foo) < 128, foo_too_large);
 //
 // The second argument to the macro is the name of the variable. If
 // the expression is false, most compilers will issue a warning/error

src/gmock-spec-builders.cc

@@ -168,6 +168,8 @@ struct MockObjectState {
   // invoked on this mock object.
   const char* first_used_file;
   int first_used_line;
+  ::std::string first_used_test_case;
+  ::std::string first_used_test;
   bool leakable;  // true iff it's OK to leak the object.
   FunctionMockers function_mockers;  // All registered methods of the object.
 };
@@ -203,8 +205,13 @@ class MockObjectRegistry {
       const MockObjectState& state = it->second;
       internal::FormatFileLocation(
           state.first_used_file, state.first_used_line, &cout);
-      cout << " ERROR: this mock object should be deleted but never is. "
-           << "Its address is @" << it->first << ".";
+      cout << " ERROR: this mock object";
+      if (state.first_used_test != "") {
+        cout << " (used in test " << state.first_used_test_case << "."
+             << state.first_used_test << ")";
+      }
+      cout << " should be deleted but never is. Its address is @"
+           << it->first << ".";
       leaked_count++;
     }
     if (leaked_count > 0) {
@@ -357,6 +364,15 @@ void Mock::RegisterUseByOnCallOrExpectCall(
   if (state.first_used_file == NULL) {
     state.first_used_file = file;
     state.first_used_line = line;
+    const TestInfo* const test_info =
+        UnitTest::GetInstance()->current_test_info();
+    if (test_info != NULL) {
+      // TODO(wan@google.com): record the test case name when the
+      // ON_CALL or EXPECT_CALL is invoked from SetUpTestCase() or
+      // TearDownTestCase().
+      state.first_used_test_case = test_info->test_case_name();
+      state.first_used_test = test_info->name();
+    }
   }
 }
 

test/gmock_output_test.py

@@ -64,6 +64,7 @@ GOLDEN_NAME = 'gmock_output_test_golden.txt'
 GOLDEN_PATH = os.path.join(gmock_test_utils.GetSourceDir(),
                            GOLDEN_NAME)
 
+
 def ToUnixLineEnding(s):
   """Changes all Windows/Mac line endings in s to UNIX line endings."""
 
@@ -109,15 +110,38 @@ def RemoveMemoryAddresses(output):
   return re.sub(r'@\w+', '@0x#', output)
 
 
-def NormalizeOutput(output):
-  """Normalizes output (the output of gmock_output_test_.exe)."""
+def RemoveTestNamesOfLeakedMocks(output):
+  """Removes the test names of leaked mock objects from the test output."""
+
+  return re.sub(r'\(used in test .+\) ', '', output)
+
+
+def GetLeakyTests(output):
+  """Returns a list of test names that leak mock objects."""
+
+  # findall() returns a list of all matches of the regex in output.
+  # For example, if '(used in test FooTest.Bar)' is in output, the
+  # list will contain 'FooTest.Bar'.
+  return re.findall(r'\(used in test (.+)\)', output)
+
+
+def GetNormalizedOutputAndLeakyTests(output):
+  """Normalizes the output of gmock_output_test_.
+
+  Args:
+    output: The test output.
+
+  Returns:
+    A tuple (the normalized test output, the list of test names that have
+    leaked mocks).
+  """
 
   output = ToUnixLineEnding(output)
   output = RemoveReportHeaderAndFooter(output)
   output = NormalizeErrorMarker(output)
   output = RemoveLocations(output)
   output = RemoveMemoryAddresses(output)
-  return output
+  return (RemoveTestNamesOfLeakedMocks(output), GetLeakyTests(output))
 
 
 def IterShellCommandOutput(cmd, stdin_string=None):
@@ -167,9 +191,8 @@ def GetShellCommandOutput(cmd, stdin_string=None):
   return string.join(lines, '')
 
 
-def GetCommandOutput(cmd):
-  """Runs a command and returns its output with all file location
-  info stripped off.
+def GetNormalizedCommandOutputAndLeakyTests(cmd):
+  """Runs a command and returns its normalized output and a list of leaky tests.
 
   Args:
     cmd:  the shell command.
@@ -177,22 +200,29 @@ def GetCommandOutput(cmd):
 
   # Disables exception pop-ups on Windows.
   os.environ['GTEST_CATCH_EXCEPTIONS'] = '1'
-  return NormalizeOutput(GetShellCommandOutput(cmd, ''))
+  return GetNormalizedOutputAndLeakyTests(GetShellCommandOutput(cmd, ''))
 
 
 class GMockOutputTest(unittest.TestCase):
   def testOutput(self):
-    output = GetCommandOutput(COMMAND)
+    (output, leaky_tests) = GetNormalizedCommandOutputAndLeakyTests(COMMAND)
     golden_file = open(GOLDEN_PATH, 'rb')
     golden = golden_file.read()
     golden_file.close()
 
+    # The normalized output should match the golden file.
     self.assertEquals(golden, output)
 
+    # The raw output should contain 2 leaked mock object errors for
+    # test GMockOutputTest.CatchesLeakedMocks.
+    self.assertEquals(['GMockOutputTest.CatchesLeakedMocks',
+                       'GMockOutputTest.CatchesLeakedMocks'],
+                      leaky_tests)
+
 
 if __name__ == '__main__':
   if sys.argv[1:] == [GENGOLDEN_FLAG]:
-    output = GetCommandOutput(COMMAND)
+    (output, _) = GetNormalizedCommandOutputAndLeakyTests(COMMAND)
     golden_file = open(GOLDEN_PATH, 'wb')
     golden_file.write(output)
     golden_file.close()

test/gmock_output_test_.cc

@@ -258,6 +258,16 @@ TEST_F(GMockOutputTest, CatchesLeakedMocks) {
   // Both foo1 and foo2 are deliberately leaked.
 }
 
+void TestCatchesLeakedMocksInAdHocTests() {
+  MockFoo* foo = new MockFoo;
+
+  // Invokes EXPECT_CALL on foo.
+  EXPECT_CALL(*foo, Bar2(_, _));
+  foo->Bar2(2, 1);
+
+  // foo is deliberately leaked.
+}
+
 int main(int argc, char **argv) {
   testing::InitGoogleMock(&argc, argv);
 
@@ -266,5 +276,6 @@ int main(int argc, char **argv) {
   testing::GMOCK_FLAG(catch_leaked_mocks) = true;
   testing::GMOCK_FLAG(verbose) = "warning";
 
+  TestCatchesLeakedMocksInAdHocTests();
   return RUN_ALL_TESTS();
 }

test/gmock_output_test_golden.txt

@@ -298,4 +298,5 @@ Stack trace:
 
 FILE:#: ERROR: this mock object should be deleted but never is. Its address is @0x#.
 FILE:#: ERROR: this mock object should be deleted but never is. Its address is @0x#.
-ERROR: 2 leaked mock objects found at program exit.
+FILE:#: ERROR: this mock object should be deleted but never is. Its address is @0x#.
+ERROR: 3 leaked mock objects found at program exit.