test: add test for css minimization

test/configCases/optimization/css-minimize/index.js

@@ -1,11 +1,10 @@
-import * as style from "./style.css";
+import "./style.css";
 
-it("should compile and load style on demand", done => {
-	expect(style).toEqual(nsObj({}));
+it("should compile", done => {
 	import("./style.css").then(x => {
 		expect(x).toEqual(nsObj({}));
 		const style = getComputedStyle(document.body);
-		expect(style.getPropertyValue("background")).toBe(" red");
+		expect(style.getPropertyValue("background")).toBe("red");
 		done();
 	}, done);
 });

test/configCases/optimization/css-minimize/webpack.config.js

@@ -1,11 +1,35 @@
+const Compilation = require("../../../../").Compilation;
+const Source = require("webpack-sources").Source;
+
 /** @type {import("../../../../").Configuration} */
 module.exports = {
 	target: "web",
-	mode: "production",
 	experiments: {
 		css: true
 	},
 	optimization: {
 		minimize: true
-	}
+	},
+	plugins: [
+		compiler => {
+			const files = {};
+			compiler.hooks.assetEmitted.tap(
+				"Test",
+				(file, { content, source, outputPath, compilation, targetPath }) => {
+					expect(Buffer.isBuffer(content)).toBe(true);
+					expect(source).toBeInstanceOf(Source);
+					expect(typeof outputPath).toBe("string");
+					expect(typeof targetPath).toBe("string");
+					expect(compilation).toBeInstanceOf(Compilation);
+					files[file] = content.toString("utf-8");
+				}
+			);
+			compiler.hooks.afterEmit.tap("Test", () => {
+				// css should be minimized
+				expect(files["bundle0.css"]).toMatchInlineSnapshot(
+					`"body{background:red}head{--webpack-179:_258}"`
+				);
+			});
+		}
+	]
 };