How to use gomega for assertions in Golang unit tests?

How to use Gomega for assertions in Golang unit testing

In Golang unit testing, Gomega is a popular and powerful assertion library , which provides rich assertion methods so that developers can easily verify test results.

Installing Gomega

go get -u github.com/onsi/gomega

Using Gomega for assertions
Here are some common examples of using Gomega for assertions:

1. Equality assertion

import "github.com/onsi/gomega"

func Test_MyFunction(t *testing.T) {
    gomega.RegisterTestingT(t)

    actual := MyFunction()
    gomega.Expect(actual).To(gomega.Equal(5))
}

2. Inequality assertion

import "github.com/onsi/gomega"

func Test_MyFunction(t *testing.T) {
    gomega.RegisterTestingT(t)

    actual := MyFunction()
    gomega.Expect(actual).NotTo(gomega.Equal(5))
}

3. Truth assertion

import "github.com/onsi/gomega"

func Test_MyFunction(t *testing.T) {
    gomega.RegisterTestingT(t)

    actual := MyFunction()
    gomega.Expect(actual).To(gomega.BeTrue())
}

4. Pointer equality assertion

import "github.com/onsi/gomega"

func Test_MyFunction(t *testing.T) {
    gomega.RegisterTestingT(t)

    actual := &MyStruct{}
    expected := &MyStruct{}
    gomega.Expect(actual).To(gomega.PointTo(expected))
}

5. Failed assertion

import "github.com/onsi/gomega"

func Test_MyFunction(t *testing.T) {
    gomega.RegisterTestingT(t)

    actual := MyFunction()
    gomega.Expect(actual).To(gomega.Equal(6), "Unexpected value")
}

Practical case
Suppose we have a function ComputeSum that calculates the sum of two numbers. We can use Gomega to write the following unit tests:

func Test_ComputeSum(t *testing.T) {
    gomega.RegisterTestingT(t)

    actual := ComputeSum(2, 3)
    gomega.Expect(actual).To(gomega.Equal(5))
}

Using Gomega allows us to easily verify test results and improve the reliability of unit tests.

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