Go代码测试覆盖率

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