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