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1.

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Division and Division

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Errors - Testing Exceptions

This section is basically the same in terms of test suites as in the Calculator project, but was not covered on the previous page.

Inside The following test suites can be found in the tst directory in test_operation.cpp the following test suites can be found:

TEST(DivideOperation, PositiveInput) {
    // Integer arguments
    ASSERT_EQ(divide(10, 5), 2);
    ASSERT_FLOAT_EQ(divide(5, 10), 0.5);
    // Floating-point arguments
    ASSERT_FLOAT_EQ(divide(10.0f, 5.0f), 2.0f);
    ASSERT_FLOAT_EQ(divide(5.0f, 10.0f), 0.5f);
}

This is a very simple check that verifies that an input is producing the desired result. However, the division function itself has two forms, one for integer input data and one for floating point data. In such a situation, both cases should be checked.

TEST(DivideOperation, NegitiveInput) {
    ASSERT_EQ(divide(-10, -5), 2);
    ASSERT_FLOAT_EQ(divide(-5, -10), 0.5);
    // Floating-point arguments
    ASSERT_FLOAT_EQ(divide(-10.0f, -5.0f), 2.0f);
    ASSERT_FLOAT_EQ(divide(-5.0f, -10.0f), 0.5f);
}

Next (above) is the negative input verification, which has exactly the same operating logic as the previous test suite, but with negative signed arguments.

And last but not least in this section, below is the zero division error check:

TEST(DivideOperation, ZerioInput) {
    EXPECT_THROW(divide(10, 0), std::overflow_error);
    EXPECT_THROW(divide(10.0f, 0.0f), std::overflow_error);
}

It is important to note that the assertion used is EXPECT_THROW, which has been specifically designed to catch and inspect a specific exception. It is also important to test for both types of input arguments.

The divide function itself has a very simple body:

float divide(int numerator, int denominator){
    if(denominator == 0){
        throw std::overflow_error("Divide by zero exception!!! Verify the denominator value!");
    }
    return float(numerator) / float(denominator);
}

The return type of this function is floating point because even if both of the arguments supplied are integers, the result need not be an integer. Basically the function takes two arguments and checks that the denominator is not zero in any case, otherwise an overflow_error exception will be thrown with the custom message.

2. Testing whether the result is within range

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