@@ -154,7 +154,7 @@ The loader context is not one of these: `LoaderContext` and the loader-definitio
    - `test/configCases/ecmaVersion/browserslist*/webpack.config.js` — these carry an **inline** snapshot of the resolved `output.environment`, so an entry there must be added to nine config files.
    - `test/unitCases/__snapshots__/target-browserslist.unittest.js.snap` — same, per browserslist query.
    - `test/unitCases/Defaults.unittest.js` — its **inline** snapshots carry the whole resolved config twice over, once for the base defaults and once per browserslist fixture, so an `output.environment` property adds a line to each. It runs in the `unit` flag, which no `configCases` or `basic` run reaches.
-   - `test/Validation.test.js` — its **inline** snapshots quote the "these properties are valid" list, so a new property under `module.rules` changes one. It runs in the `integration` matrix, not `basic`.
+   - `test/unitCases/Validation.unittest.js` — its **inline** snapshots quote the "these properties are valid" list, so a new property under `module.rules` changes one. It runs in the `unit` matrix, not `basic`.
 
 Skipping any layer silently breaks the option. After editing schemas, run `yarn fix:special` so `lib/` code can reference the updated types. If you added or modified options, consider updating `examples/` and run `yarn build:examples` to verify.
 
 
@@ -105,7 +105,7 @@ This document explains the structure of the `test/` directory in the Webpack pro
 - **Options**: `--output <file>` (report path), `--baseline <file>` (report to compare against), `--summary <file>` (append the markdown comparison, e.g. `$GITHUB_STEP_SUMMARY`), `--filter` / `--negative-filter` (regexps matched against `<category>/<case>`, also read from `FILTER` / `NEGATIVE_FILTER`).
 - **Note**: the cases are built with the defaults a user gets — minification on, no `output.pathinfo` — not with the `ConfigTestCases` ones. Needs Node.js >= 22.15 for zstd.
 
-### 16. `BannerPlugin.test.js`
+### 16. `unitCases/BannerPlugin.unittest.js`
 
 - **Purpose**: Tests Webpack’s `BannerPlugin` functionality.
 - **Usage**: Ensures that the plugin correctly adds banners to the bundled files.
 
@@ -287,16 +287,16 @@ export default defineConfig([
 		}
 	},
 	{
-		files: ["test/Compiler-filesystem-caching.test.js"],
+		files: ["test/unitCases/Compiler-filesystem-caching.unittest.js"],
 		languageOptions: {
 			ecmaVersion: 2022
 		}
 	},
 	{
 		files: [
 			"test/configCases/{dll-plugin-entry,dll-plugin-side-effects,dll-plugin}/**/webpack.config.js",
-			"test/NodeTemplatePlugin.test.js",
-			"test/PersistentCaching.test.js"
+			"test/unitCases/NodeTemplatePlugin.unittest.js",
+			"test/unitCases/PersistentCaching.unittest.js"
 		],
 		rules: {
 			"import/extensions": "off",
 
@@ -30,7 +30,9 @@ const typescriptSource = fs.readFileSync(
 const threeEsmPath = fileURLToPath(import.meta.resolve("three"));
 const threeEsmSource = fs.readFileSync(threeEsmPath, "utf8");
 const threeEsmMinSource = fs.readFileSync(
-	threeEsmPath.replace(/\.js$/, ".min.js"),
+	fileURLToPath(
+		new URL("../../js/benchmark/three.module.min.js", import.meta.url)
+	),
 	"utf8"
 );
 // Popular libraries also shipped as devDependencies.
 
@@ -0,0 +1,24 @@
+import fs from "fs/promises";
+import { fileURLToPath } from "url";
+import { minify } from "terser";
+
+export async function setup() {
+	const source = await fs.readFile(
+		fileURLToPath(import.meta.resolve("three")),
+		"utf8"
+	);
+	const { code } = await minify(source, { module: true });
+
+	if (!code) {
+		throw new Error("Failed to minify the three ESM fixture");
+	}
+
+	const outputPath = fileURLToPath(
+		new URL("../../js/benchmark/three.module.min.js", import.meta.url)
+	);
+
+	await fs.mkdir(new URL("../../js/benchmark/", import.meta.url), {
+		recursive: true
+	});
+	await fs.writeFile(outputPath, code);
+}
@@ -1,12 +1,13 @@
 "use strict";
 
 const path = require("path");
+const testDirectory = path.resolve(__dirname, "..");
 const fs = require("graceful-fs");
 
-const webpack = require("..");
-const expectNoDeprecations = require("./helpers/expectNoDeprecations");
+const webpack = require("../..");
+const expectNoDeprecations = require("../helpers/expectNoDeprecations");
 
-const pluginDir = path.join(__dirname, "js", "BannerPlugin");
+const pluginDir = path.join(testDirectory, "js", "BannerPlugin");
 const outputDir = path.join(pluginDir, "output");
 
 expectNoDeprecations();
@@ -42,15 +43,15 @@ describe("BannerPlugin", () => {
 			expect(footerFileResults[0]).toBe("/*! banner is a string */");
 			fs.writeFileSync(entry2File, "2", "utf8");
 			compiler.run((err, stats) => {
-				const { assets } = /** @type {import("../").Stats} */ (stats).toJson();
-				const assetsList = /** @type {import("../").StatsAsset[]} */ (assets);
+				const { assets } = /** @type {import("../../").Stats} */ (stats).toJson();
+				const assetsList = /** @type {import("../../").StatsAsset[]} */ (assets);
 				expect(
-					/** @type {import("../").StatsAsset} */ (
+					/** @type {import("../../").StatsAsset} */ (
 						assetsList.find((as) => as.name === "entry1.js")
 					).emitted
 				).toBe(false);
 				expect(
-					/** @type {import("../").StatsAsset} */ (
+					/** @type {import("../../").StatsAsset} */ (
 						assetsList.find((as) => as.name === "entry2.js")
 					).emitted
 				).toBe(true);
 
@@ -1,29 +1,30 @@
 "use strict";
 
-require("./helpers/warmup-webpack");
+require("../helpers/warmup-webpack");
 
 const path = require("path");
+const testDirectory = path.resolve(__dirname, "..");
 const fs = require("graceful-fs");
 const { Volume, createFsFromVolume } = require("memfs");
 /** @type {(path: string, callback: (err?: unknown) => void) => void} */
 const rimraf = require("rimraf");
-const expectNoDeprecations = require("./helpers/expectNoDeprecations");
+const expectNoDeprecations = require("../helpers/expectNoDeprecations");
 
 /**
- * @param {import("../").Configuration} config config
- * @returns {import("../").Compiler} compiler
+ * @param {import("../../").Configuration} config config
+ * @returns {import("../../").Compiler} compiler
  */
 const createCompiler = (config) => {
-	const webpack = require("..");
+	const webpack = require("../..");
 
-	const compiler = /** @type {import("../").Compiler} */ (webpack(config));
+	const compiler = /** @type {import("../../").Compiler} */ (webpack(config));
 	compiler.outputFileSystem = /** @type {EXPECTED_ANY} */ (
 		createFsFromVolume(new Volume())
 	);
 	return compiler;
 };
 
-const tempFolderPath = path.join(__dirname, "ChangesAndRemovalsTemp");
+const tempFolderPath = path.join(testDirectory, "ChangesAndRemovalsTemp");
 const tempFilePath = path.join(tempFolderPath, "temp-file.js");
 const tempFile2Path = path.join(tempFolderPath, "temp-file2.js");
 
@@ -37,7 +38,7 @@ const createSingleCompiler = () =>
 	});
 
 /**
- * @param {import("../").Compiler} compiler compiler
+ * @param {import("../../").Compiler} compiler compiler
  * @param {() => void} action action
  */
 const onceDone = (compiler, action) => {
@@ -50,7 +51,7 @@ const onceDone = (compiler, action) => {
 };
 
 /**
- * @param {import("../").Compiler} compiler compiler
+ * @param {import("../../").Compiler} compiler compiler
  * @returns {{ removed: string[] | undefined, modified: string[] | undefined }} changes
  */
 const getChanges = (compiler) => {
@@ -127,7 +128,7 @@ describe("ChangesAndRemovals", () => {
 				});
 			})
 		);
-		const watcher = /** @type {import("../").Watching} */ (
+		const watcher = /** @type {import("../../").Watching} */ (
 			compiler.watch({ aggregateTimeout: 200 }, (err) => {
 				if (err) done(err);
 			})
@@ -140,7 +141,7 @@ describe("ChangesAndRemovals", () => {
 
 	it("should track modified files when they've been modified", (done) => {
 		const compiler = createSingleCompiler();
-		/** @type {import("../").Watching | null} */
+		/** @type {import("../../").Watching | null} */
 		let watcher = null;
 
 		compiler.hooks.watchRun.tap("ChangesAndRemovalsTest", (compiler) => {
@@ -154,7 +155,7 @@ describe("ChangesAndRemovals", () => {
 			watcher = null;
 		});
 
-		watcher = /** @type {import("../").Watching} */ (
+		watcher = /** @type {import("../../").Watching} */ (
 			compiler.watch({ aggregateTimeout: 200 }, (err) => {
 				if (err) done(err);
 			})
@@ -167,7 +168,7 @@ describe("ChangesAndRemovals", () => {
 
 	itSkipBun("should track removed file when removing file", (done) => {
 		const compiler = createSingleCompiler();
-		/** @type {import("../").Watching | null} */
+		/** @type {import("../../").Watching | null} */
 		let watcher = null;
 
 		compiler.hooks.watchRun.tap("ChangesAndRemovalsTest", (compiler) => {
@@ -181,7 +182,7 @@ describe("ChangesAndRemovals", () => {
 			watcher = null;
 		});
 
-		watcher = /** @type {import("../").Watching} */ (
+		watcher = /** @type {import("../../").Watching} */ (
 			compiler.watch({ aggregateTimeout: 200 }, (err) => {
 				if (err) done(err);
 			})
 
@@ -1,18 +1,19 @@
 "use strict";
 
-require("./helpers/warmup-webpack");
+require("../helpers/warmup-webpack");
 
 const path = require("path");
+const testDirectory = path.resolve(__dirname, "..");
 const { Volume, createFsFromVolume } = require("memfs");
 
-/** @typedef {import("../").Compilation} Compilation */
-/** @typedef {import("../").Compiler} Compiler */
-/** @typedef {import("../").Module} Module */
-/** @typedef {import("../").NormalModule} NormalModule */
-/** @typedef {import("../").Stats} Stats */
-/** @typedef {import("../").WebpackPluginInstance} WebpackPluginInstance */
+/** @typedef {import("../../").Compilation} Compilation */
+/** @typedef {import("../../").Compiler} Compiler */
+/** @typedef {import("../../").Module} Module */
+/** @typedef {import("../../").NormalModule} NormalModule */
+/** @typedef {import("../../").Stats} Stats */
+/** @typedef {import("../../").WebpackPluginInstance} WebpackPluginInstance */
 
-const CONTEXT = path.join(__dirname, "fixtures");
+const CONTEXT = path.join(testDirectory, "fixtures");
 
 // One fixture per nesting level, so every level owns a module instance no other
 // level shares — a shared instance is cleaned up by whichever level is reached.
@@ -26,7 +27,7 @@ const LEVEL_ENTRIES = ["./a.js", "./b.js", "./main1.js", "./main2.js"];
  */
 const nestedChildPlugin = (depth) => ({
 	apply(compiler) {
-		const webpack = require("..");
+		const webpack = require("../..");
 
 		compiler.hooks.make.tapAsync(
 			"NestedChildPlugin",
@@ -105,12 +106,12 @@ const collectLevels = (compilation, level, out) => {
 /**
  * Runs one compilation and hands the compiler and stats to the caller before
  * closing it.
- * @param {import("../").Configuration} options webpack options
+ * @param {import("../../").Configuration} options webpack options
  * @returns {Promise<{ compiler: Compiler, stats: Stats, close: () => Promise<void> }>} the finished build
  */
 const build = (options) =>
 	new Promise((resolve, reject) => {
-		const webpack = require("..");
+		const webpack = require("../..");
 
 		const compiler = webpack({
 			mode: "production",
@@ -119,7 +120,7 @@ const build = (options) =>
 			...options
 		});
 		compiler.outputFileSystem =
-			/** @type {import("../").OutputFileSystem} */
+			/** @type {import("../../").OutputFileSystem} */
 			(/** @type {unknown} */ (createFsFromVolume(new Volume())));
 		compiler.run((err, stats) => {
 			if (err) return reject(err);
@@ -140,12 +141,12 @@ const build = (options) =>
 
 /**
  * Runs one watch build and resolves once the compiler has gone idle.
- * @param {import("../").Configuration} options webpack options
+ * @param {import("../../").Configuration} options webpack options
  * @returns {Promise<{ compiler: Compiler, stats: Stats, close: () => Promise<void> }>} the finished build
  */
 const watchOnce = (options) =>
 	new Promise((resolve, reject) => {
-		const webpack = require("..");
+		const webpack = require("../..");
 
 		const compiler = webpack({
 			mode: "production",
@@ -154,10 +155,10 @@ const watchOnce = (options) =>
 			...options
 		});
 		compiler.outputFileSystem =
-			/** @type {import("../").OutputFileSystem} */
+			/** @type {import("../../").OutputFileSystem} */
 			(/** @type {unknown} */ (createFsFromVolume(new Volume())));
 		let settled = false;
-		const watching = /** @type {import("../").Watching} */ (
+		const watching = /** @type {import("../../").Watching} */ (
 			compiler.watch({ aggregateTimeout: 10 }, (err, stats) => {
 				if (settled) return;
 				settled = true;
@@ -193,7 +194,7 @@ describe("Compilation release", () => {
 
 		// what the next build does before it starts
 		const internalCompiler =
-			/** @type {import("../lib/Compiler")} */
+			/** @type {import("../../lib/Compiler")} */
 			(/** @type {unknown} */ (compiler));
 
 		internalCompiler._cleanupLastCompilation();
@@ -217,7 +218,7 @@ describe("Compilation release", () => {
 			output: { path: "/" }
 		});
 		const internalCompiler =
-			/** @type {import("../lib/Compiler")} */
+			/** @type {import("../../lib/Compiler")} */
 			(/** @type {unknown} */ (compiler));
 
 		expect(stats.compilation.modules.size).toBeGreaterThan(0);
Original file line number	Diff line number	Diff line change
`@@ -287,16 +287,16 @@ export default defineConfig([`
`287`	`287`	`}`
`288`	`288`	`},`
`289`	`289`	`{`
`290`		`- files: ["test/Compiler-filesystem-caching.test.js"],`
	`290`	`+ files: ["test/unitCases/Compiler-filesystem-caching.unittest.js"],`
`291`	`291`	`languageOptions: {`
`292`	`292`	`ecmaVersion: 2022`
`293`	`293`	`}`
`294`	`294`	`},`
`295`	`295`	`{`
`296`	`296`	`files: [`
`297`	`297`	`"test/configCases/{dll-plugin-entry,dll-plugin-side-effects,dll-plugin}/**/webpack.config.js",`
`298`		`- "test/NodeTemplatePlugin.test.js",`
`299`		`- "test/PersistentCaching.test.js"`
	`298`	`+ "test/unitCases/NodeTemplatePlugin.unittest.js",`
	`299`	`+ "test/unitCases/PersistentCaching.unittest.js"`
`300`	`300`	`],`
`301`	`301`	`rules: {`
`302`	`302`	`"import/extensions": "off",`