C++ Testing

ASSERT_EQ(x.size(), y.size()) << "Vectors x and y are of unequal length";
for (int i = 0; i < x.size(); ++i) {
  EXPECT_EQ(x[i], y[i]) << "Vectors x and y differ at index " << i;
// Tests factorial of 0.
TEST(FactorialTest, HandlesZeroInput) {
  EXPECT_EQ(Factorial(0), 1);
// Tests factorial of positive numbers.
TEST(FactorialTest, HandlesPositiveInput) {
  EXPECT_EQ(Factorial(1), 1);
  EXPECT_EQ(Factorial(2), 2);
  EXPECT_EQ(Factorial(3), 6);
  EXPECT_EQ(Factorial(8), 40320);

Test Fixtures: Using the Same Data Configuration for Multiple Tests

  1. Derive a class from ::testing::Test . Start its body with protected:, as we’ll want to access fixture members from sub-classes.
  2. Inside the class, declare any objects you plan to use.
  3. If necessary, write a default constructor or SetUp() function to prepare the objects for each test. A common mistake is to spell SetUp() as Setup() with a small u - Use override in C++11 to make sure you spelled it correctly.
  4. If necessary, write a destructor or TearDown() function to release any resources you allocated in SetUp() . To learn when you should use the constructor/destructor and when you should use SetUp()/TearDown(), read the FAQ.
  5. If needed, define subroutines for your tests to share.

When using a fixture, use TEST_F() instead of TEST() as it allows you to access objects and subroutines in the test fixture:

TEST_F(TestFixtureName, TestName) {
  ... test body ...