Golang测试覆盖率工具使用详解

go test -coverprofile=coverage.out

go test ./mypackage -coverprofile=coverage.out

go tool cover -html=coverage.out

go test -cover

PASS
coverage: 85.7% of statements
ok      example/mathutil    0.002s

// mathutil/math.go
package mathutil

func Average(nums []float64) float64 {
    if len(nums) == 0 {
        return 0
    }
    var sum float64
    for _, v := range nums {
        sum += v
    }
    return sum / float64(len(nums))
}

// mathutil/math_test.go
package mathutil

import "testing"

func TestAverage(t *testing.T) {
    tests := []struct {
        name     string
        input    []float64
        expected float64
    }{
        {"空切片", []float64{}, 0},
        {"单元素", []float64{5}, 5},
        {"多个元素", []float64{2, 4, 6}, 4},
    }

    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            result := Average(tt.input)
            if result != tt.expected {
                t.Errorf("期望 %v，实际 %v", tt.expected, result)
            }
        })
    }
}

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