test: add test

packages/rspack-cli/tests/build/issue-6214/entry.js

@@ -0,0 +1,2 @@
+const long_name_should_be_minified = process.env.NODE_ENV;
+console.log(long_name_should_be_minified);

packages/rspack-cli/tests/build/issue-6214/index.test.ts

@@ -0,0 +1,9 @@
+import { readFile, run } from "../../utils/test-utils";
+import { resolve } from "path";
+
+it("should not have `process.env.NODE_ENV` when optimization.nodeEnv has been set", async () => {
+	await run(__dirname, ["--mode", "production"]);
+	const mainJs = await readFile(resolve(__dirname, "dist/main.js"), "utf-8");
+	expect(mainJs).toContain("process.env.NODE_ENV");
+	expect(mainJs).not.toContain("long_name_should_be_minified");
+});

packages/rspack-cli/tests/build/issue-6214/rspack.config.js

@@ -0,0 +1,14 @@
+const path = require("path");
+
+/** @type {import('@rspack/cli').Configuration} */
+module.exports = {
+	mode: "development", // will be override to "production" by "--mode"
+	entry: "./entry.js",
+	output: {
+		clean: true,
+		path: path.resolve(__dirname, "dist")
+	},
+	optimization: {
+		nodeEnv: false
+	}
+};