Uncover the secrets of test cases with go test

go test Reveal the secrets of test cases: Test case structure: func TestXxx(t *testing.T) {}, where t is a built-in type that provides testing functions. Assertion: Check whether the test result is as expected, for example, assert.Equal() compares whether the values ​​are equal, assert.Nil() checks whether the object is nil, and assert.True() checks whether the condition is true.

Use go test to reveal the secrets of test cases

Introduction

In Go Language, go test is an indispensable testing tool that allows us to verify the correctness and robustness of the code. Understanding the mechanics behind test cases is crucial to effectively utilizing this powerful tool.

The structure of test cases

Go test cases usually use the following structure:

func TestXxx(t *testing.T) {
    // 测试逻辑
}

Where:

• TestXxx is the name of the test case.
• t *testing.T is a built-in type that provides test cases with functionality such as running subtests, logging, and failing tests.

Assertion

Assertions are a key component of test cases. They allow us to check whether the results of the test logic are as expected. Go provides many built-in assertions, such as:

• assert.Equal(t, expected, actual): Checks whether the expected value and the actual value are equal.
• assert.Nil(t, obj): Check whether the object is nil.
• assert.True(t, condition): Check whether the condition is true.

Practical case

To demonstrate the usage of go test, let us create a simple function that compares two numbers Add and return the result:

func Add(a, b int) int {
    return a + b
}

Then, we can write a test case to verify this function:

func TestAdd(t *testing.T) {
    assert.Equal(t, 3, Add(1, 2))
}

Conclusion

By understanding the test case Using structures and assertions, developers can effectively utilize go test to verify the correctness of their Go code. This article provides practical examples as a reference to help understand how to write and run test cases.

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