feat: add lab1

Author: AxelHowe

.github/workflows/lab1.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: lab1
+
+on:
+  push:
+    paths:
+      - 'lab1/**'
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    
+    - uses: actions/setup-go@v4
+      with:
+        go-version-file: 'lab1/go.mod'
+        cache: false
+
+    - name: Run
+      working-directory: 'lab1'
+      run: go test

lab1/lab1.go

@@ -0,0 +1,21 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Welcome to Simple Calculator")
+
+	var a, b int64
+	fmt.Print("Enter first number: ")
+	fmt.Scan(&a)
+
+	fmt.Print("Enter second number: ")
+	fmt.Scan(&b)
+
+	fmt.Println("Add:", Add(a, b))
+	fmt.Println("Subtract:", Sub(a, b))
+	fmt.Println("Multiply:", Mul(a, b))
+	fmt.Println("Divide:", Div(a, b))
+}
+
+// TODO: Create `Add`, `Sub`, `Mul`, `Div` function here

lab1/lab1_test.go

@@ -0,0 +1,83 @@
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var testCases = []struct {
+	a, b, addExpected, subExpected, mulExpected, divExpected int64
+}{
+	{1, 2, 3, -1, 2, 0},
+	{17, 3, 20, 14, 51, 5},
+	{2147, 107, 2254, 2040, 229729, 20},
+	{39957, 673, 40630, 39284, 26891061, 59},
+	{45571256, 1007, 45572263, 45570249, 45890254792, 45254},
+}
+
+func TestAdd(t *testing.T) {
+	for _, tc := range testCases {
+		assert.Equal(t, tc.addExpected, Add(tc.a, tc.b))
+	}
+}
+
+func TestSub(t *testing.T) {
+	for _, tc := range testCases {
+		assert.Equal(t, tc.subExpected, Sub(tc.a, tc.b))
+	}
+}
+
+func TestMul(t *testing.T) {
+	for _, tc := range testCases {
+		assert.Equal(t, tc.mulExpected, Mul(tc.a, tc.b))
+	}
+}
+
+func TestDiv(t *testing.T) {
+	for _, tc := range testCases {
+		assert.Equal(t, tc.divExpected, Div(tc.a, tc.b))
+	}
+}
+
+func TestE2E(t *testing.T) {
+	var err error
+
+	r1, w1, _ := os.Pipe()
+	r2, w2, _ := os.Pipe()
+
+	stdin := os.Stdin
+	stdout := os.Stdout
+
+	defer func() {
+		os.Stdin = stdin
+		os.Stdout = stdout
+	}()
+
+	os.Stdin = r1
+	os.Stdout = w2
+
+	buf := make([]byte, 1024)
+	var n int
+
+	for _, tc := range testCases {
+		input := fmt.Sprintf("%d\n%d\n", tc.a, tc.b)
+		expected := fmt.Sprintf("Add: %d\nSubtract: %d\nMultiply: %d\nDivide: %d\n", tc.addExpected, tc.subExpected, tc.mulExpected, tc.divExpected)
+
+		if _, err = w1.Write([]byte(input)); err != nil {
+			t.Fatal(err)
+		}
+		main()
+
+		if n, err = r2.Read(buf); err != nil {
+			t.Fatal(err)
+		}
+		if n < 70 {
+			t.Fatal("Error")
+		}
+		assert.Equal(t, expected, string(buf[70:n]))
+	}
+}