test(testing): 添加中位数计算和通道通信测试用例

- 新增 TestNormal: 测试 GetMiddNumber 中位数计算逻辑
- 新增 TestChannel: 模拟通道传球 goroutine 交互

go/testing/normal_test.go

@@ -0,0 +1,48 @@
+package testing
+
+import (
+	"sort"
+	"testing"
+	"time"
+)
+
+func TestNormal(t *testing.T) {
+	numbers := map[int][]int{
+		1: {8, 2, 4, 4},
+		2: {0, 5, 3},
+		3: {1},
+	}
+	for _, numbers := range numbers {
+		middle := GetMiddNumber(numbers)
+		t.Log(middle)
+	}
+
+}
+
+func GetMiddNumber(numbers []int) float64 {
+	sort.Ints(numbers)
+	length := len(numbers)
+	isOddNUmber := length%2 == 1
+	if !isOddNUmber {
+		return float64(numbers[length/2-1]+numbers[length/2]) / 2.0
+	}
+	return float64(numbers[length/2])
+}
+
+func TestChannel(t *testing.T) {
+	var ball = make(chan string)
+	kickBall := func(playerName string) {
+		for {
+			t.Log(<-ball, "传球", "\n")
+			time.Sleep(time.Second)
+			ball <- playerName
+		}
+	}
+	go kickBall("张三")
+	go kickBall("李四")
+	go kickBall("王二麻子")
+	go kickBall("刘大")
+	ball <- "裁判"    // 开球
+	var c chan bool // 一个零值nil通道
+	<-c             // 永久阻塞在此
+}