我想指定一个值在上限和下限之间的期望值。
Google Test 提供了 LT,LE,GT,GE,但是无法测试我能看到的范围。您可以使用
EXPECT_NEAR
并兼顾操作数,但在许多情况下,这不如明确设置上限和下限那么清楚。
用法应类似于:
EXPECT_WITHIN_INCLUSIVE(1, 3, 2); // 2 is in range [1,3]
如何添加这种期望?
Google 测试具有更丰富的可组合匹配器:
// expect that x is >= 1 and <= 3
EXPECT_THAT(x, AllOf(Ge(1),Le(3)));
也许这对你有用。
请参阅此处“复合匹配器”部分下的googletest
matchers.md
文档
只使用谷歌测试(不是模拟),那么简单明了的答案是:
EXPECT_TRUE((a >= 1) && (a <= 3)); // a is between 1 and 3 inclusive
我发现这比一些基于模拟的答案更具可读性。
--- 开始编辑 --
上面的简单答案没有提供任何有用的诊断
您可以使用
AssertionResult
来定义一个自定义断言,它确实会产生有用的错误消息,就像这样。
#include <gtest/gtest.h>
::testing::AssertionResult IsBetweenInclusive(int val, int a, int b)
{
if((val >= a) && (val <= b))
return ::testing::AssertionSuccess();
else
return ::testing::AssertionFailure()
<< val << " is outside the range " << a << " to " << b;
}
TEST(testing, TestPass)
{
auto a = 2;
EXPECT_TRUE(IsBetweenInclusive(a, 1, 3));
}
TEST(testing, TestFail)
{
auto a = 5;
EXPECT_TRUE(IsBetweenInclusive(a, 1, 3));
}
我会定义这些宏:
#define EXPECT_IN_RANGE(VAL, MIN, MAX) \
EXPECT_GE((VAL), (MIN)); \
EXPECT_LE((VAL), (MAX))
#define ASSERT_IN_RANGE(VAL, MIN, MAX) \
ASSERT_GE((VAL), (MIN)); \
ASSERT_LE((VAL), (MAX))
google mock cheat sheet 中有一个很好的例子:
using namespace testing;
MATCHER_P2(IsBetween, a, b,
std::string(negation ? "isn't" : "is") + " between " + PrintToString(a)
+ " and " + PrintToString(b))
{
return a <= arg && arg <= b;
}
然后使用它:
TEST(MyTest, Name) {
EXPECT_THAT(42, IsBetween(40, 46));
}
最后我创建了一个宏来执行此操作,它类似于 Google 测试库中的其他宏。
#define EXPECT_WITHIN_INCLUSIVE(lower, upper, val) \
do { \
EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperGE, val, lower); \
EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperLE, val, upper); \
} while (0)
在不需要谷歌模拟的谷歌测试中使用现有的布尔函数。链接非常具体。
这是例子。
// Returns true iff m and n have no common divisors except 1. bool MutuallyPrime(int m, int n) { ... } const int a = 3; const int b = 4; const int c = 10;
断言 EXPECT_PRED2(MutuallyPrime, a, b);会成功,而 断言 EXPECT_PRED2(MutuallyPrime, b, c);将失败 讯息
!MutuallyPrime(b, c) is false, where b is 4 c is 10