如何加速 Golang 单元测试的执行速度？

为了加速 Golang 单元测试执行，可以采取以下措施：1. 进行并行测试以同时运行多个测试；2. 复用测试数据以减少创建和初始化数据的开销；3. 通过 mocking 模拟依赖项来避免不必要的外部调用；4. 使用 benching 找出执行时间最长的测试并进行优化。

如何加速 Golang 单元测试的执行速度？

Golang 的单元测试虽然强大，但执行速度较慢，从而影响了开发效率。本文将介绍几种方法来加速测试执行，优化开发流程。

1. 并行测试

Go 1.18 起支持并行测试，即同时运行多个测试。这对于大项目尤为有利。

package main

import (
    "testing"
    "sync"
)

// TestParallel runs tests in parallel using the t.Parallel() function.
func TestParallel(t *testing.T) {
    // Create a channel to signal completion.
    done := make(chan struct{})
    defer close(done)

    // Create a wait group to track running tests.
    var wg sync.WaitGroup

    // Start multiple test goroutines.
    for i := 0; i < 10; i++ {
        wg.Add(1)
        go func(i int) {
            defer wg.Done()

            t.Run("Test"+strconv.Itoa(i), func(t *testing.T) {
                // Your test code here
                time.Sleep(100 * time.Millisecond)
            })
        }(i)
    }

    // Wait for all tests to complete before returning.
    go func() {
        wg.Wait()
        close(done)
    }()

    <-done // Block until all tests have finished.
}

2. 复用测试数据

预先创建和复用测试数据可以减少测试执行时间。

package main

import (
    "testing"
    "sync"
)

var testData map[string]interface{}
var testDataLock sync.RWMutex

// TestDataSetup runs once before all tests and creates test data.
func TestDataSetup(t *testing.T) {
    testDataLock.Lock()
    defer testDataLock.Unlock()
    if testData == nil {
        // Create and initialize test data here.
    }
}

// TestExample runs a test using the shared test data.
func TestExample(t *testing.T) {
    TestDataSetup(t) // Ensure test data is available before each test.

    // Use testData in your test code.
}

3. mocking

通过 mocking 依赖项，模拟外部调用并消除瓶颈。

package main

import (
    "testing"
)

type MyInterface interface {
    DoSomething()
}

type MockMyInterface struct {
    DoSomethingCalled bool
}

func (m *MockMyInterface) DoSomething() {
    m.DoSomethingCalled = true
}

// TestExample uses a mocked dependency to speed up testing.
func TestExample(t *testing.T) {
    mock := &MockMyInterface{}
    // Pass mock to your code under test.

    // Assertions using mock.DoSomethingCalled to verify behavior.
}

4. Benching

使用 benching 找出执行时间最长的测试并对其进行优化。

package main

import (
    "testing"
    "time"
)

func TestSlow(t *testing.T) {
    for i := 0; i < 10000; i++ {
        // Time-consuming operation.
    }
}

func TestFast(t *testing.T) {
    for i := 0; i < 100; i++ {
        // Fast operation.
    }
}

func TestBenchmark(t *testing.T) {
    for i := 0; i < benchmarkN; i++ {
        t.Run("TestSlow", func(t *testing.T) {
            b := testing.Benchmark(TestSlow)
            log.Println(b.N, b.NsPerOp())
        })

        t.Run("TestFast", func(t *testing.T) {
            b := testing.Benchmark(TestFast)
            log.Println(b.N, b.NsPerOp())
        })
    }
}

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