add test case

test/watchCases/plugins/automatic-prefetch-plugin-9485/0/delayed.js

@@ -0,0 +1 @@
+})]

test/watchCases/plugins/automatic-prefetch-plugin-9485/0/foo/0.js

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+module.exports = '0';

test/watchCases/plugins/automatic-prefetch-plugin-9485/0/foo/a.js

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+module.exports = "This ";

test/watchCases/plugins/automatic-prefetch-plugin-9485/0/foo/b.js

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+module.exports = "is only ";

test/watchCases/plugins/automatic-prefetch-plugin-9485/0/foo/c.js

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+module.exports = "a test";

test/watchCases/plugins/automatic-prefetch-plugin-9485/0/index.js

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+it("should watch for changes", function () {
+	if (+WATCH_STEP !== 3) expect(require("./delayed")).toBe(WATCH_STEP);
+	else expect(require("./delayed")).toBe("This is only a test." + WATCH_STEP);
+	if (+WATCH_STEP > 0) {
+		for (var m of STATS_JSON.modules.filter(m =>
+			/(a|b|c)\.js$/.test(m.identifier)
+		))
+			expect(m.issuer).toBe(null);
+	}
+});

test/watchCases/plugins/automatic-prefetch-plugin-9485/1/foo/1.js

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+module.exports = '1';

test/watchCases/plugins/automatic-prefetch-plugin-9485/2/foo/2.js

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+module.exports = '2';

test/watchCases/plugins/automatic-prefetch-plugin-9485/3/foo/3.js

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+var a = require("./a");
+var b = require("./b");
+var c = require("./c");
+
+module.exports = a + b + c + '.3';

test/watchCases/plugins/automatic-prefetch-plugin-9485/delayed.js

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+module.exports = function (source) {
+	expect(source).toMatch(/^\}\)\]/);
+	this.cacheable(false);
+	return new Promise(resolve => {
+		setTimeout(() => {
+			resolve("module.exports = require('./foo/' + WATCH_STEP);");
+		}, 500);
+	});
+};

test/watchCases/plugins/automatic-prefetch-plugin-9485/webpack.config.js

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+const path = require("path");
+const webpack = require("../../../../");
+
+/** @type {import("../../../../").Configuration} */
+module.exports = {
+	module: {
+		rules: [
+			{
+				test: /delayed/,
+				use: path.resolve(__dirname, "./delayed")
+			}
+		]
+	},
+	plugins: [new webpack.AutomaticPrefetchPlugin()]
+};