02.02 (spies/mocks) and 02.03 (time mocking)

Author: HugoDF

.github/workflows/nodejs.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         # node-version: [lts/*, 21.x]
-        node-version: [lts/*]
+        node-version: [21.x]
 
     steps:
       - uses: actions/checkout@v4

src/02.02-to-be-called.test.js

@@ -0,0 +1,18 @@
+import { test, mock } from "node:test";
+import assert from "node:assert/strict";
+const myObject = {
+	doSomething() {
+		console.log("does something");
+	},
+};
+
+test("stub .callCount()", () => {
+	const stub = mock.fn();
+	stub();
+	assert.equal(stub.mock.callCount(), 1);
+});
+test("spyOn .callCount()", () => {
+	const somethingSpy = mock.method(myObject, "doSomething");
+	myObject.doSomething();
+	assert.equal(somethingSpy.mock.callCount(), 1);
+});

src/02.02-to-have-been-called.test.js

@@ -0,0 +1,37 @@
+import { test, mock, afterEach } from "node:test";
+import assert from "node:assert/strict";
+
+const isNode20OrLower = process.versions.node.split(".")[0] <= "20";
+
+const getCurrentDate = () => new Date();
+
+afterEach(() => {
+	mock.timers.reset();
+});
+
+test(
+	"mock.timers can mock Date and be reset",
+	{ skip: isNode20OrLower },
+	(t) => {
+		t.mock.timers.enable({
+			// @ts-ignore
+			apis: ["Date"],
+			now: new Date("2023-05-14T11:01:58.135Z"),
+		});
+
+		assert.deepEqual(getCurrentDate(), new Date("2023-05-14T11:01:58.135Z"));
+
+		t.mock.timers.reset();
+		assert(new Date().getFullYear() > 2023);
+	},
+);
+
+test("mock.timers can mock Date.now()", { skip: isNode20OrLower }, (t) => {
+	t.mock.timers.enable({
+		// @ts-ignore
+		apis: ["Date"],
+		now: new Date("2023-05-14T11:01:58.135Z"),
+	});
+
+	assert.deepEqual(Date.now(), 1684062118135);
+});

src/02.03-date-now-spy.test.js

@@ -0,0 +1,14 @@
+import { test, mock } from "node:test";
+import assert from "node:assert/strict";
+
+const getNow = () => new Date(Date.now());
+
+test("It should create correct now Date", () => {
+	mock
+		.method(global.Date, "now")
+		.mock.mockImplementationOnce(() =>
+			new Date("2023-05-14T11:01:58.135Z").valueOf(),
+		);
+
+	assert.deepEqual(getNow(), new Date("2023-05-14T11:01:58.135Z"));
+});