test(the-typeinator): add index.test.js for syntactic-sugar

test(the-typeinator): add index.test.js for syntactic-sugar step

Author: Felsilva15

projects/from-javascript-to-typescript/the-typeinator/01-syntactic-sugar/index.test.js

@@ -0,0 +1,19 @@
+const { announceMachines } = require("./index");
+
+test("announceMachines returns correct count", () => {
+	const messages = [];
+
+	const result = announceMachines(
+		(msg) => messages.push(msg),
+		{ make: "Honda", model: "Civic" },
+		{ make: "Toyota", model: "Corolla", label: "Compact Car" },
+		{ make: "Ford", model: "Focus", label: "Eco Car" },
+	);
+
+	expect(result).toBe(2);
+	expect(messages).toEqual([
+		"Make: Honda Model: Civic",
+		"Compact Car",
+		"Eco Car",
+	]);
+});