feat: add lab3

Author: AxelHowe

.github/workflows/lab3.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: lab3
+
+on:
+  push:
+    paths:
+      - 'lab3/**'
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    
+    - uses: actions/setup-go@v4
+      with:
+        go-version-file: 'lab3/go.mod'
+        cache: false
+
+    - name: Run
+      working-directory: 'lab3'
+      run: go test

lab3/lab3.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"strconv"
+	"strings"
+)
+
+func Calculator(w http.ResponseWriter, r *http.Request) {
+	// TODO: implement a calculator
+	
+
+}
+
+func main() {
+	http.HandleFunc("/", Calculator)
+	log.Fatal(http.ListenAndServe(":8083", nil))
+}

lab3/lab3_test.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"github.com/stretchr/testify/assert"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestCalculator(t *testing.T) {
+	testData := []struct {
+		path     string
+		expected string
+	}{
+		{"/add/1/2", "1 + 2 = 3"},
+		{"/add", "Error!"},
+		{"/sub/7/2", "7 - 2 = 5"},
+		{"/sub/7/2/3", "Error!"},
+		{"/mul/3/4", "3 * 4 = 12"},
+		{"/mul/3", "Error!"},
+		{"/div/10/3", "10 / 3 = 3, reminder = 1"},
+		{"/div/10/0", "Error!"},
+		{"/div/10/3/4", "Error!"},
+		{"/div/10/a", "Error!"},
+		{"/div/a/3", "Error!"},
+		{"/gcd/10/3", "Error!"},
+		{"/gcd/10/3/4", "Error!"},
+		{"/favicon.ico", "Error!"},
+		{"/", "Error!"},
+	}
+
+	for _, tc := range testData {
+		w := httptest.NewRecorder()
+		r := httptest.NewRequest("GET", tc.path, nil)
+
+		Calculator(w, r)
+
+		assert.Equal(t, tc.expected, w.Body.String())
+	}
+}