测试自动化 2011/06/12 - 4 GTest Advanced Guide

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本文详细介绍了GoogleTest框架中的各种断言用法，包括如何使错误消息更具可读性、预定义的断言宏、断言放置的最佳实践及如何定制输出信息等。适合希望深入了解GoogleTest并提高单元测试质量的开发者。

0. 杂问杂记
Unlike TestNG, GoogleTest does not use Exception to report failure/success of a test.

1. More assertions

Focus: to make the error message more readable.
* Exception Assertions
ASSERT_THROW( statement , exception_type );
^ What's this ?
* Predicate assertion
ASSERT_PRED1(pred1, val1);
ASSERT_PRED2(pred2, val1, val2);

* ActionResult
例:

::testing::AssertionResult IsEven(int n)

Q：似乎把测试的写进了生产代码？？？

* Floating-point comparison（略）
* Type Assertions

2. Assertions placement

You can use assertions in any C++ function. In particular, it doesn't
have to be a method of the test fixture class. The one constraint is
that assertions that generate a fatal failure (FAIL* and ASSERT_*) can only be used in void-returning functions.

Note
: Constructors and destructors are not considered
void-returning functions, according to the C++ language specification,
and so you may not use fatal assertions in them.

3. 输出信息定制
operator << (::std::ostream &os, const T &t);
void PrintTo(const T &t, ::std::ostream *os);