What tools are there for testing and coverage of golang functions?

Function testing and coverage tools: Testing tools: Go standard library testingtestify/assert coverage tools: go testgopcover

##Go function testing and coverage Tools

In Go development, testing and measuring coverage of functions is crucial to ensure the correctness and reliability of the code. The Go ecosystem provides a variety of mature tools for this purpose.

Testing Tool

• Go standard library testing: The Go standard library provides a built-in testing package, using For writing and running test cases. It provides a friendly API that allows you to easily define tests and assertions.

  import (
    "testing"
  
    "github.com/stretchr/testify/assert"
  )
  
  func TestAdd(t *testing.T) {
    assert.Equal(t, 10, Add(5, 5))
  }

• testify/assert: This is a third-party library that provides a series of assertion functions that allow you to more easily verify expected values ​​against actual results. It provides a clean, readable syntax for writing tests.

  import "github.com/stretchr/testify/assert"
  
  func TestAdd(t *testing.T) {
    result := Add(5, 5)
    assert.True(t, result == 10)
  }

Coverage tool

• ##go test

  ：go test The command includes a built-in coverage tool that can generate code coverage reports when running tests. It provides fine-grained coverage information by file, package, and function. <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:go;toolbar:false;'>go test -coverprofile=coverage.out</pre><div class="contentsignin">Copy after login</div></div>

• gopcover

  : This is a lightweight third-party coverage tool that generates more detailed reports including uncovered lines of code. It can also generate visual coverage reports.

  gopcover -v -o coverage.html

Practical case

The following is a test written using the

go test

and testing libraries Example of: <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:go;toolbar:false;'>package main import ( &quot;testing&quot; ) func Add(a, b int) int { return a + b } func TestAdd(t *testing.T) { tests := []struct { a, b int expected int }{ {1, 2, 3}, {3, 4, 7}, } for _, test := range tests { t.Run(string(test.a)+&quot;+&quot;+string(test.b), func(t *testing.T) { result := Add(test.a, test.b) if result != test.expected { t.Errorf(&quot;Expected %d, got %d&quot;, test.expected, result) } }) } }</pre><div class="contentsignin">Copy after login</div></div> In this example, the </p>TestAdd<p> function contains a slice containing the input value and the expected output value. For each test case, the function runs the test and reports any mismatch using <code>t.Errorf.

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