func TestFib(t *testing.T) {
    var fibTests = []struct {
        in       int // input
        expected int // expected result
    }{
        {1, 1},
        {2, 1},
        {3, 2},
        {4, 3},
        {5, 5},
        {6, 8},
        {7, 13},
    }
    for _, tt := range fibTests {
        actual := Fib(tt.in)
        if actual != tt.expected {
            t.Errorf("Fib(%d) = %d; expected %d", tt.in, actual, tt.expected)
        }
    }
}

func BenchmarkHello(b *testing.B) {
    for i := 0; i < b.N; i++ {
        // do sth
    }
}

func BenchmarkHelloParallel(b *testing.B) {
  b.RunParallel(func(pb *testing.PB) {
    // do sth
  })
}

testing.Benchmark(func(b *testing.B) {
		var compares int64
		for i := 0; i < b.N; i++ {
			s := []int{5, 4, 3, 2, 1}
			sort.Slice(s, func(i, j int) bool {
				compares++
				return s[i] < s[j]
			})
		}
		// This metric is per-operation, so divide by b.N and
		// report it as a "/op" unit.
		b.ReportMetric(float64(compares)/float64(b.N), "compares/op")
		// This metric is per-time, so divide by b.Elapsed and
		// report it as a "/ns" unit.
		b.ReportMetric(float64(compares)/float64(b.Elapsed().Nanoseconds()), "compares/ns")
	})

func TestSubTest(t *testing.T) {
	t.Run("sub1", func(t *testing.T) {
		t.Log("sub1")
	})
	t.Run("sub2", func(t *testing.T) {
		t.Log("sub2")
	})
	t.Run("sub3", func(t *testing.T) {
		t.Log("sub3")
	})
}

func FuzzReverse(f *testing.F) {
  	// 為模糊測(cè)試添加用例到種子語料庫
    testcases := []string{"Hello, world", " ", "!12345"}
    for _, tc := range testcases {
        f.Add(tc)  // Use f.Add to provide a seed corpus
    }
  	// 進(jìn)行模糊測(cè)試。對(duì)于string類型的參數(shù)，將生成隨機(jī)字符串
  	// 對(duì)于本測(cè)試中的Reverse方法是可逆的，因此可以通過兩次逆行操作來驗(yàn)證其正確性
    f.Fuzz(func(t *testing.T, orig string) {
        rev := Reverse(orig)
        doubleRev := Reverse(rev)
        if orig != doubleRev {
            t.Errorf("Before: %q, after: %q", orig, doubleRev)
        }
        if utf8.ValidString(orig) && !utf8.ValidString(rev) {
            t.Errorf("Reverse produced invalid UTF-8 string %q", rev)
        }
    })
}