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Go代码测试覆盖率

发布时间 2024-01-05 10:02:29作者: dongzhiwei-blog

Go代码测试覆盖率

  1. 目录结构

    ├── main.go
└── main_test.go

  2. 代码

    // main.go
package main
import "fmt"
func Divide(a, b float64) (float64, error) {
	if b == 0 {
		return 0, fmt.Errorf("division by zero is not allowed")
	}

	return a / b, nil
}

// main_test
package main
import "testing"
func Test_Divide(t *testing.T) {
	testCases := []struct {
		a          float64
		b          float64
		expected   float64
		shouldFail bool
	}{
		{10.0, 2.0, 5.0, false},
		{15.0, 3.0, 5.0, false},
	}

	for _, tc := range testCases {
		result, err := Divide(tc.a, tc.b)

		if tc.shouldFail {
			if err == nil {
				t.Errorf("Expected an error for %f/%f but got none", tc.a, tc.b)
			}
		} else {
			if err != nil {
				t.Errorf("Unexpected error for %f/%f: %s", tc.a, tc.b, err)
			}

			if result != tc.expected {
				t.Errorf("Expected %f/%f to be %f, but got %f", tc.a, tc.b, tc.expected, result)
			}
		}
	}
}

  3. 执行以下命令，生成文件c.out

    go test -coverprofile=c.out

  4. 执行以下命令，会自动打开浏览器

    go tool cover -html=c.out

  5. 会看到以下结果

image