Add test calc

.github/workflows/calc.yaml

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+name: Calc
+
+on:
+  push:
+    branches:
+      -  main
+
+
+jobs:
+  test_job:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checking the repository
+        uses: actions/checkout@v4
+
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18
+
+      - name: Start test
+        run: node testcalc.js

calc.js

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+function sum(a, b) {
+  return a + b;
+}
+
+module.exports = sum;

testcalc.js

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+const sum = require('./calc.js');
+
+function testSum() {
+  console.log('Start testing the sum function');
+
+  if (sum(5, 4) === 9) {
+    console.log('Test 1 passed');
+  } else {
+    console.log('Test 1 failed')
+  }
+
+  if (sum(1, 1) === 2) { 
+    console.log('Test 2 passed');
+  } else { 
+    console.log('Test 2 failed')
+  }
+
+  if (sum(2, 2) === 5) { 
+    console.log('Test 3 passed');
+  } else { 
+    console.log('Test 3 failed')
+  }
+}
+
+testSum();