How to use the assertion library for Go function unit testing

In Go unit testing, use the testify/assert assertion library to simplify result verification. The specific steps are as follows: Install the assert library. Create a test program and include the functions to be tested. Use Equal assertions in test functions to verify expected behavior. Add more assertions to validate various test scenarios.

How to use assertion library in Go function unit testing

Assertion library is very useful when doing unit testing in Go, It makes validating test results simple and straightforward. This article will show you how to test Go functions using the popular assertion library called testify/assert.

1. Install the assertion library

Use the following command to install testify/assert:

go get github.com/stretchr/testify/assert

2. Create Test program

Create a test.go file containing the function to be tested:

package yourpackage

import (
    "testing"

    "github.com/stretchr/testify/assert"
)

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

3. Use assertions in the test function

Use the Equal assertion in the assert package to verify the expected behavior of the function:

func TestSum(t *testing.T) {
    result := Sum(1, 2)
    assert.Equal(t, 3, result, "Sum(1, 2) should be 3")
}

4. Add more assertions

You can use various assertions to verify multiple test situations:

• Equal: Verify that two values ​​are equal.
• NotEqual: Verifies that two values ​​are not equal.
• True: Verifies that a Boolean value is true.
• False: Verifies that a Boolean value is false.
• NotNil: Verifies that a pointer or value is not nil.

Practical case:

Test a function that calculates the length of a string:

func TestStringLength(t *testing.T) {
    result := StringLength("hello")
    assert.Equal(t, 5, result, "StringLength(\"hello\") should be 5")
}

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