类的public函数在面向对象编程中是最常见亦是最常规的函数，但是其单元测试的展开跟普通函数并无二致[这里指的是没有其他对象依赖的情况，有依赖的场景请参考本系列的有依赖对象的场景文章]，下面来看看具体如何实施。
1.首先构建测试套件，定义一个继承自testing::Test的类
class modelTest : public testing::Test {
protected:
};
2.同样需要复写SetUp/TearDown两个函数
class modelTest : public testing::Test {
protected:
void SetUp() override {
}
void TearDown() override {
}
};
3.定义想要测试单元测试需要用到的数据，并在SetUp进行初始化，在TearDown中进行清理或析构。
class modelTest : public testing::Test {
protected:
void SetUp() override {
pm = new model;
}
void TearDown() override {
if (pm) {
delete pm;
pm = NULL;
}
}
model* pm;
};
4.通过TEST_F宏定义想要测试的类的public函数的测试用例
TEST_F(modelTest, IsPrimeNegative) {
// This test belongs to the IsPrimeTest test case.
EXPECT_FALSE(pm->IsPrime(-1));
EXPECT_FALSE(pm->IsPrime(-2));
EXPECT_FALSE(pm->IsPrime(INT_MIN));
}
// Tests some trivial cases.
TEST_F(modelTest, IsPrimeTrivial) {
EXPECT_FALSE(pm->IsPrime(0));
EXPECT_FALSE(pm->IsPrime(1));
EXPECT_TRUE(pm->IsPrime(2));
EXPECT_TRUE(pm->IsPrime(3));
}
// Tests positive input.
TEST_F(modelTest, IsPrimePositive) {
EXPECT_FALSE(pm->IsPrime(4));
EXPECT_TRUE(pm->IsPrime(5));
EXPECT_FALSE(pm->IsPrime(6));
EXPECT_TRUE(pm->IsPrime(23));
}
对应的demo源码,请点击PublicFuc.