Golang子测试(subtests)有什么优势 演示t.Run分层测试组织

package main

import (
    "fmt"
    "testing"
)

func TestMyFunction(t *testing.T) {
    // 基础测试
    t.Run("Basic Test", func(t *testing.T) {
        result := myFunction(1)
        if result != 2 {
            t.Errorf("Basic test failed, expected 2, got %d", result)
        }
    })

    // 边界值测试
    t.Run("Edge Cases", func(t *testing.T) {
        t.Run("Zero Input", func(t *testing.T) {
            result := myFunction(0)
            if result != 1 {
                t.Errorf("Zero input test failed, expected 1, got %d", result)
            }
        })

        t.Run("Negative Input", func(t *testing.T) {
            result := myFunction(-1)
            if result != 0 {
                t.Errorf("Negative input test failed, expected 0, got %d", result)
            }
        })
    })

    // 性能测试（可选）
    t.Run("Performance Test", func(t *testing.T) {
        t.Skip("Skipping performance test for now") // 暂时跳过性能测试
        // 性能测试代码...
    })
}

func myFunction(input int) int {
    return input + 1
}

func ExampleMyFunction() {
    result := myFunction(5)
    fmt.Println(result)
    // Output: 6
}

func TestMyFunctionParameterized(t *testing.T) {
    testCases := []struct {
        name     string
        input    int
        expected int
    }{
        {"Positive Input", 1, 2},
        {"Zero Input", 0, 1},
        {"Negative Input", -1, 0},
        {"Large Positive Input", 100, 101},
        {"Large Negative Input", -100, -99},
    }

    for _, tc := range testCases {
        t.Run(tc.name, func(t *testing.T) {
            result := myFunction(tc.input)
            if result != tc.expected {
                t.Errorf("Test case %s failed, expected %d, got %d", tc.name, tc.expected, result)
            }
        })
    }
}

func BenchmarkMyFunction(b *testing.B) {
    b.Run("Small Input", func(b *testing.B) {
        for i := 0; i < b.N; i++ {
            myFunction(1)
        }
    })

    b.Run("Large Input", func(b *testing.B) {
        for i := 0; i < b.N; i++ {
            myFunction(1000)
        }
    })
}