feat: add lab7

Author: AxelHowe

.github/workflows/lab7.yml

@@ -0,0 +1,26 @@
+# This workflow will build a golang project
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go
+
+name: lab7
+
+on:
+  push:
+    paths:
+      - 'lab7/**'
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    
+    - uses: actions/setup-go@v4
+      with:
+        go-version-file: 'lab7/go.mod'
+        cache: false
+
+    - name: Run
+      working-directory: 'lab7'
+      run: go test

lab7/lab7.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"sync"
+	"time"
+)
+
+var doorStatus string
+var handStatus string
+
+func hand() {
+	handStatus = "in"
+	time.Sleep(time.Millisecond * 200)
+	handStatus = "out"
+	wg.Done()
+}
+
+func door() {
+	doorStatus = "close"
+	time.Sleep(time.Millisecond * 200)
+	if handStatus == "in" {
+		fmt.Println("夾到手了啦！")
+	} else {
+		fmt.Println("沒夾到喔！")
+	}
+	doorStatus = "open"
+	wg.Done()
+}
+
+var wg sync.WaitGroup
+
+func main() {
+	for i := 0; i < 50; i++ {
+		wg.Add(2)
+		go door()
+		go hand()
+		wg.Wait()
+		time.Sleep(time.Millisecond * 200)
+	}
+}

lab7/lab7_test.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"github.com/stretchr/testify/assert"
+	"os"
+	"strings"
+	"testing"
+)
+
+func TestLab08(t *testing.T) {
+	var err error
+	r2, w2, _ := os.Pipe()
+	stdout := os.Stdout
+
+	defer func() {
+		os.Stdout = stdout
+	}()
+	os.Stdout = w2
+
+	buf := make([]byte, 10240)
+	var n int
+
+	main()
+	n, err = r2.Read(buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := strings.Repeat("沒夾到喔！\n", 50)
+	assert.Equal(t, expected, string(buf[:n]))
+}