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Google Mock の EXPECT_CALL 定義順について

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0.はじめに

Google Mock ドキュメント日本語訳(複数の Expectation を利用する)

Google Mock のデフォルトでは,モックメソッドが呼び出されると,引数にマッチするアクティブな Expectation が見つかるまで,定義順とは逆方向に Expectation を探索します

1.簡単なテストコードで動作を確認

テスト対象とモック
// モック
class MockMyCalck
{
public:
	MOCK_METHOD2(add, int(int, int));
	MOCK_METHOD2(sub, int(int, int));
} *mockPtr = NULL;

int add(int a, int b)
{
	EXPECT_NE(mockPtr, (MockMyCalck*)NULL);
	return mockPtr->add(a, b);
}

int sub(int a, int b)
{
	EXPECT_NE(mockPtr, (MockMyCalck*)NULL);
	return mockPtr->sub(a, b);
}

// テスト対象関数
void function(void)
{
	add(1, 2);
	add(3, 4);
	add(5, 6);
}
テスト対象関数と同じ順番に定義
TEST(Sample, 00)
{
	MockMyCalck mock;
	mockPtr = &mock;

	// Define Expection
	EXPECT_CALL(*mockPtr, add(1, 2)).Times(1);
	EXPECT_CALL(*mockPtr, add(3, 4)).Times(1);
	EXPECT_CALL(*mockPtr, add(5, 6)).Times(1);
	
	function();
}
適当な順番に定義
	// Define Expection
	EXPECT_CALL(*mockPtr, add(5, 6)).Times(1);
	EXPECT_CALL(*mockPtr, add(3, 4)).Times(1);
	EXPECT_CALL(*mockPtr, add(1, 2)).Times(1);
ループで定義
	// Define Expection
	std::vector<std::vector<int>> v = {{1, 2}, {3, 4}, {5, 6}};
	for(auto x : v){
		EXPECT_CALL(*mock_ptr, add(x.at(0), x.at(1))).Times(1);
	}
実行結果
[==========] Running 3 tests from 1 test suite.
[----------] Global test environment set-up.
[----------] 3 tests from Sample
[ RUN      ] Sample.00
[       OK ] Sample.00 (0 ms)
[ RUN      ] Sample.01
[       OK ] Sample.01 (0 ms)
[ RUN      ] Sample.02
[       OK ] Sample.02 (0 ms)
[----------] 3 tests from Sample (0 ms total)

[----------] Global test environment tear-down
[==========] 3 tests from 1 test suite ran. (0 ms total)
[  PASSED  ] 3 tests.
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