test: add test case to pr-16701

test/configCases/inner-graph/pr-18342/common/index.js

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+import pure from './pure'
+
+export default () => {
+	pure()
+}

test/configCases/inner-graph/pr-18342/common/pure.js

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+function pure() {
+	console.log('pureFn');
+}
+
+export default pure

test/configCases/inner-graph/pr-18342/entry1/index.js

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+import common from "../common";
+
+it("entry1 should compile and run", () => {
+	common()
+	console.log('entry1');
+	expect(true).toBe(true)
+});

test/configCases/inner-graph/pr-18342/entry2/index.js

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+it("entry2 should compile and run", () => {
+	import(/* webpackChunkName: "chunk-reason-webpackChunkName" */'../common').then(common => {
+		common.default()
+		console.log('entry2');
+		expect(true).toBe(true)
+	})
+});

test/configCases/inner-graph/pr-18342/entry3/a.js

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+export default 'a'

test/configCases/inner-graph/pr-18342/entry3/index.js

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+it("entry3 should compile and run", () => {
+	import(/* webpackChunkName: "chunk-reason-webpackChunkName" */'./a.js').then(a => {
+    console.log(a.default);
+		console.log('entry3');
+		expect(true).toBe(true)
+	})
+});

test/configCases/inner-graph/pr-18342/test.config.js

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+const findOutputFiles = require("../../../helpers/findOutputFiles");
+
+module.exports = {
+	findBundle(_, options) {
+		const files = findOutputFiles(options, new RegExp(`^entry`));
+		return files;
+	}
+};

test/configCases/inner-graph/pr-18342/webpack.config.js

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+module.exports = {
+	target: ["node"],
+	entry: {
+		entry1: ["./entry1/index.js"],
+		entry2: ["./entry2/index.js"],
+		entry3: ["./entry3/index.js"]
+	},
+	output: {
+		filename: "[name].js",
+		chunkFilename: "[name].chunk.js"
+	},
+	optimization: {
+		minimize: false,
+		runtimeChunk: true,
+		splitChunks: {
+			chunks: "initial",
+			cacheGroups: {
+				pureFn: {
+					test: /pure/,
+					enforce: true,
+					name: "chunk-reason-split-chunks"
+				}
+			}
+		}
+	}
+};