HCK-9565: init unit tests automation config (#36)

* HCK-9565: add base unit tests example using nodejs test runner

* prettify example tests and fix hooks installation

* move running tests to pre-push hook

* finalize running tests on pre-push hook

buildConstants.js

@@ -16,6 +16,7 @@ const EXCLUDED_FILES = [
 	'.prettierignore',
 	'.prettierrc',
 	'.dockerignore',
+	'test',
 	'build',
 	'release',
 	'node_modules',

package.json

@@ -101,11 +101,13 @@
     },
     "simple-git-hooks": {
         "pre-commit": "npx lint-staged",
-        "pre-push": "npx eslint ."
+        "pre-push": "npx eslint . && npm run test:unit"
     },
     "scripts": {
         "lint": "eslint . --max-warnings=0",
-        "package": "node esbuild.package.js"
+		"test:unit": "node --experimental-test-module-mocks --test ./test/**/*.spec.js",
+        "package": "node esbuild.package.js",
+		"postinstall": "npx simple-git-hooks"
     },
     "devDependencies": {
         "@hackolade/hck-esbuild-plugins-pack": "0.0.1",

test/testExample/calculator.js

@@ -0,0 +1,11 @@
+const { add, multiply } = require('./math');
+
+function calculateSum(a, b) {
+	return add(a, b);
+}
+
+function calculateProduct(a, b) {
+	return multiply(a, b);
+}
+
+module.exports = { calculateSum, calculateProduct };

test/testExample/calculator.spec.js

@@ -0,0 +1,33 @@
+const { mock, before, describe, it } = require('node:test');
+const assert = require('node:assert');
+
+describe('calculator', () => {
+	let calculator;
+	let addSpy;
+	let multiplySpy;
+
+	before(() => {
+		addSpy = mock.fn(() => 42);
+		multiplySpy = mock.fn(() => -1);
+
+		mock.module('./math', {
+			namedExports: {
+				add: addSpy,
+				multiply: multiplySpy,
+			},
+		});
+		calculator = require('./calculator');
+	});
+
+	it('calculateSum uses mocked add function', () => {
+		const result = calculator.calculateSum(2, 3);
+		assert.strictEqual(result, 42);
+		assert.strictEqual(addSpy.mock.calls.length, 1);
+	});
+
+	it('calculateProduct uses mocked multiply function', () => {
+		const result = calculator.calculateProduct(2, 3);
+		assert.strictEqual(result, -1);
+		assert.strictEqual(multiplySpy.mock.calls.length, 1);
+	});
+});

test/testExample/math.js

@@ -0,0 +1,9 @@
+function add(a, b) {
+	return a + b;
+}
+
+function multiply(a, b) {
+	return a * b;
+}
+
+module.exports = { add, multiply };