chore: organize test files

packages/webpack5/scripts/jest.mockWarn.ts

@@ -0,0 +1,64 @@
+import { printExpected, printReceived } from 'jest-matcher-utils';
+import dedent from 'ts-dedent';
+
+expect.extend({
+	toHaveBeenWarned(received: string) {
+		asserted.add(received);
+		const passed = warnSpy.mock.calls
+			.map((args) => args[1])
+			.some((arg) => arg.indexOf(received) > -1);
+		if (passed) {
+			return {
+				pass: true,
+				message() {
+					return `expected ${printReceived(received)} not to have been warned`;
+				},
+			};
+		}
+
+		const warnings = warnSpy.mock.calls.map((args) => args[1]).join('\n\n');
+		return {
+			pass: false,
+			message() {
+				return dedent`
+					expected ${printExpected(received)} to have been warned.
+
+					Actual warnings:
+
+					${warnings}
+				`;
+			},
+		};
+	},
+});
+
+let warnSpy: any;
+let asserted = new Set([]);
+beforeEach(() => {
+	asserted.clear();
+
+	warnSpy = jest.spyOn(console, 'warn');
+
+	warnSpy.mockImplementation(() => {});
+});
+
+afterEach(() => {
+	const assertedArray = Array.from(asserted);
+	const nonAssertedWarns = warnSpy.mock.calls
+		.map((args) => args[1])
+		.filter((received) => {
+			return !assertedArray.some((assertedMessage) => {
+				return received.indexOf(assertedMessage) > -1;
+			});
+		});
+
+	warnSpy.mockRestore();
+
+	if (nonAssertedWarns.length) {
+		throw new Error(dedent`
+			Test case printed unexpected warnings:
+
+			${printReceived(nonAssertedWarns.join('\n\n'))}
+		`);
+	}
+});