Go 関数の単体テスト時のパフォーマンス最適化のヒント

import "testing"

func BenchmarkFibonacci(b *testing.B) {
    for n := 0; n < b.N; n++ {
        fibonacci(30)
    }
}

func Fibonacci(n int) int {
    if n == 0 || n == 1 {
        return 1
    }
    return Fibonacci(n-1) + Fibonacci(n-2)
}

go test -count 16 -parallel 4

Convey("When testing the Fibonacci function", t) {
    Convey("It should return the correct result", func() {
        So(Fibonacci(30), ShouldEqual, 832040)
    })
}

import (
    "net/http"
    "testing"
)

func TestGetPage(t *testing.T) {
    // Create a mock HTTP client
    httpClient := &http.Client{Transport: &http.Transport{}}

    // Set expectations for the mock HTTP client
    httpClient.Transport.(*http.Transport).RoundTripFunc = func(req *http.Request) (*http.Response, error) {
        response := &http.Response{
            StatusCode: http.StatusOK,
            Body:       ioutil.NopCloser(strings.NewReader("Hello, world!")),
        }
        return response, nil
    }

    // Use the mock HTTP client to test the GetPage function
    result, err := GetPage(httpClient)
    if err != nil {
        t.Errorf("GetPage() failed: %v", err)
    }
    if result != "Hello, world!" {
        t.Errorf("GetPage() returned unexpected result: %v", result)
    }
}

go test -coverprofile=coverage.out
go tool cover -html=coverage.out