chore: organize test files

packages/webpack5/scripts/jest.setup.ts

@@ -0,0 +1,35 @@
+import './jest.mockFiles';
+// we are mocking the cwd for the tests, since webpack needs absolute paths
+// and we don't want them in tests
+process.cwd = () => '__jest__';
+
+jest.mock('cosmiconfig', () => ({
+	cosmiconfigSync(moduleName) {
+		return {
+			search() {
+				// no-op in tests
+				return null;
+			},
+		};
+	},
+}));
+
+jest.mock('path', () => {
+	const path = jest.requireActual('path');
+	return {
+		...path,
+		resolve(...args) {
+			if (args[0] === '__jest__') {
+				return path.join(...args);
+			}
+
+			const resolved = path.resolve(...args);
+			if (resolved.includes('__jest__')) {
+				const li = resolved.lastIndexOf('__jest__');
+				return resolved.substr(li);
+			}
+
+			return resolved;
+		},
+	};
+});