Prompt Title: Black Box Testing.

Sure, here's an example GoogleTest code with comments that covers the basic features:

cppCopy code
#include <gtest/gtest.h>

// Fixture class for setting up and tearing down test cases
class MyFixture : public ::testing::Test {
protected:
  void SetUp() override {
    // Code to run before each test case
  }

  void TearDown() override {
    // Code to run after each test case
  }

  int my_variable_ = 42; // Fixture member variable
};

// Tests that a condition is true
TEST(TestSuiteName, TestName) {
  EXPECT_TRUE(true);
}

// Tests that a condition is false
TEST(TestSuiteName, TestName2) {
  EXPECT_FALSE(false);
}

// Tests that two values are equal
TEST_F(MyFixture, TestName3) {
  EXPECT_EQ(my_variable_, 42);
}

// Tests that two values are not equal
TEST_F(MyFixture, TestName4) {
  EXPECT_NE(my_variable_, 43);
}

// Tests that a value is greater than another value
TEST_F(MyFixture, TestName5) {
  EXPECT_GT(my_variable_, 41);
}

// Tests that a value is less than another value
TEST_F(MyFixture, TestName6) {
  EXPECT_LT(my_variable_, 43);
}

// Tests that a value is greater than or equal to another value
TEST_F(MyFixture, TestName7) {
  EXPECT_GE(my_variable_, 42);
}

// Tests that a value is less than or equal to another value
TEST_F(MyFixture, TestName8) {
  EXPECT_LE(my_variable_, 42);
}

// Tests that a function throws an exception
TEST(TestSuiteName, TestName9) {
  EXPECT_THROW(throw std::runtime_error("Error!"), std::runtime_error);
}

// Tests that a function does not throw an exception
TEST(TestSuiteName, TestName10) {
  EXPECT_NO_THROW(42);
}

// Tests that a function takes less than a specified amount of time to run
TEST(TestSuiteName, TestName11) {
  EXPECT_TRUE(true); // Placeholder for time-based test
}

// Main function to run all tests
int main(int argc, char **argv) {
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}

This code includes the following features:

• Fixture class for setting up and tearing down test cases (MyFixture)
• Assertion macros for testing true/false conditions (EXPECT_TRUE, EXPECT_FALSE)
• Assertion macros for testing equality and inequality (EXPECT_EQ, EXPECT_NE)
• Assertion macros for testing greater than/less than relationships (EXPECT_GT, EXPECT_LT, EXPECT_GE, EXPECT_LE)
• Assertion macros for testing exceptions (EXPECT_THROW, EXPECT_NO_THROW)
• Placeholder for time-based test (EXPECT_TRUE(true))
• Main function to run all tests

Of course, this is just a basic example, and there are many more features and options available in GoogleTest.