七、异常检查
| Fatal assertion | Nonfatal assertion | Verifies |
| ASSERT_THROW(statement, exception_type); | EXPECT_THROW(statement, exception_type); | statement throws an exception of the given type |
| ASSERT_ANY_THROW(statement); | EXPECT_ANY_THROW(statement); | statement throws an exception of any type |
| ASSERT_NO_THROW(statement); | EXPECT_NO_THROW(statement); | statement doesn't throw any exception |
例如：
| int Foo(int a, int b) { if (a == 0 || b == 0) { throw "don't do that"; } int c = a % b; if (c == 0) return b; return Foo(b, c); } TEST(FooTest, HandleZeroInput) { EXPECT_ANY_THROW(Foo(10, 0)); EXPECT_THROW(Foo(0, 5), char*); } |
八、Predicate Assertions
在使用EXPECT_TRUE或ASSERT_TRUE时，有时希望能够输出更加详细的信息，比如检查一个函数的返回值TRUE还是FALSE时，希望能够输出传入的参数是什么，以便失败后好跟踪。因此提供了如下的断言：
| Fatal assertion | Nonfatal assertion | Verifies |
| ASSERT_PRED1(pred1, val1); | EXPECT_PRED1(pred1, val1); | pred1(val1) returns true |
| ASSERT_PRED2(pred2, val1, val2); | EXPECT_PRED2(pred2, val1, val2); | pred2(val1, val2) returns true |
| ... | ... | ... |
Google人说了，他们只提供<=5个参数的，如果需要测试更多的参数，直接告诉他们。下面看看这个东西怎么用。
| bool MutuallyPrime(int m, int n) { return Foo(m , n) > 1; } TEST(PredicateAssertionTest, Demo) { int m = 5, n = 6; EXPECT_PRED2(MutuallyPrime, m, n); } |
当失败时，返回错误信息：
error: MutuallyPrime(m, n) evaluates to false, where
m evaluates to 5
n evaluates to 6
