Golang表格驱动测试实现方法

func divide(a, b float64) (float64, error) {
    if b == 0 {
        return 0, fmt.Errorf("division by zero")
    }
    return a / b, nil
}

func TestDivide(t *testing.T) {
    tests := []struct {
        name     string
        a, b     float64
        want     float64
        hasError bool
    }{
        {"positive", 6, 3, 2, false},
        {"negative", -8, 4, -2, false},
        {"zero dividend", 0, 5, 0, false},
        {"division by zero", 5, 0, 0, true},
        {"fraction", 1, 3, 0.333, false},
    }

    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            got, err := divide(tt.a, tt.b)
            if tt.hasError {
                if err == nil {
                    t.Fatalf("expected error but got none")
                }
                return
            }
            if err != nil {
                t.Fatalf("unexpected error: %v", err)
            }
            if math.Abs(got-tt.want) > 1e-3 {
                t.Errorf("got %.3f, want %.3f", got, tt.want)
            }
        })
    }
}

var validCases = []struct{...}
var invalidCases = []struct{...}