chore: Add a test for user input

src/RobotApp.test.js

@@ -0,0 +1,35 @@
+const readline = require("readline");
+
+const RobotApp = require("./RobotApp");
+const RobotSimulator = require("./RobotSimulator");
+const Table = require("./Table");
+const Robot = require("./Robot");
+
+jest.mock("readline");
+
+describe("RobotApp", () => {
+  beforeEach(() => {
+    readline.createInterface.mockClear();
+  });
+
+  it("should ask for user input", async () => {
+    const mockQuestion = jest.fn();
+    readline.createInterface.mockReturnValue({
+      question: mockQuestion,
+      on: jest.fn(),
+      close: jest.fn(),
+    });
+
+    setTimeout(() => mockQuestion.mock.calls[0][1]("PLACE 0,0,NORTH"), 0);
+
+    const simulator = new RobotSimulator(new Table(5, 5), new Robot());
+    const robotApp = new RobotApp(simulator);
+
+    robotApp.start();
+
+    expect(mockQuestion).toHaveBeenCalledWith(
+      "Enter a command (or 'q' to quit): ",
+      expect.anything()
+    );
+  });
+});