base/gtest_prod_util.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef BASE_GTEST_PROD_UTIL_H_
   6 #define BASE_GTEST_PROD_UTIL_H_
   7
   8 #include "testing/gtest/include/gtest/gtest_prod.h"
   9
  10 // This is a wrapper for gtest's FRIEND_TEST macro that friends
  11 // test with all possible prefixes. This is very helpful when changing the test
  12 // prefix, because the friend declarations don't need to be updated.
  13 //
  14 // Example usage:
  15 //
  16 // class MyClass {
  17 //  private:
  18 //   void MyMethod();
  19 //   FRIEND_TEST_ALL_PREFIXES(MyClassTest, MyMethod);
  20 // };
  21 #define FRIEND_TEST_ALL_PREFIXES(test_case_name, test_name) \
  22   FRIEND_TEST(test_case_name, test_name); \
  23   FRIEND_TEST(test_case_name, DISABLED_##test_name); \
  24   FRIEND_TEST(test_case_name, FLAKY_##test_name)
  25
  26 // C++ compilers will refuse to compile the following code:
  27 //
  28 // namespace foo {
  29 // class MyClass {
  30 //  private:
  31 //   FRIEND_TEST_ALL_PREFIXES(MyClassTest, TestMethod);
  32 //   bool private_var;
  33 // };
  34 // }  // namespace foo
  35 //
  36 // class MyClassTest::TestMethod() {
  37 //   foo::MyClass foo_class;
  38 //   foo_class.private_var = true;
  39 // }
  40 //
  41 // Unless you forward declare MyClassTest::TestMethod outside of namespace foo.
  42 // Use FORWARD_DECLARE_TEST to do so for all possible prefixes.
  43 //
  44 // Example usage:
  45 //
  46 // FORWARD_DECLARE_TEST(MyClassTest, TestMethod);
  47 //
  48 // namespace foo {
  49 // class MyClass {
  50 //  private:
  51 //   FRIEND_TEST_ALL_PREFIXES(::MyClassTest, TestMethod);  // NOTE use of ::
  52 //   bool private_var;
  53 // };
  54 // }  // namespace foo
  55 //
  56 // class MyClassTest::TestMethod() {
  57 //   foo::MyClass foo_class;
  58 //   foo_class.private_var = true;
  59 // }
  60
  61 #define FORWARD_DECLARE_TEST(test_case_name, test_name) \
  62   class test_case_name##_##test_name##_Test; \
  63   class test_case_name##_##DISABLED_##test_name##_Test; \
  64   class test_case_name##_##FLAKY_##test_name##_Test
  65
  66 #endif  // BASE_GTEST_PROD_UTIL_H_