add watch test case

test/watchCases/cache/loader-import-module/0/a.generate-json.js

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+export const value = 42;
+export * from "./imported.js";
+export { default as nested } from "./b.generate-json.js";
+export const random = Math.random();

test/watchCases/cache/loader-import-module/0/b.generate-json.js

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+export const value = 42;
+export * from "./imported.js";

test/watchCases/cache/loader-import-module/0/imported.js

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+export const a = "a";
+export const b = "b";

test/watchCases/cache/loader-import-module/0/index.js

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+import a from "./a.generate-json.js";
+import { value as unrelated } from "./unrelated";
+
+it("should have to correct values and validate on change", () => {
+	const step = +WATCH_STEP;
+	expect(a.value).toBe(42);
+	expect(a.a).toBe("a");
+	expect(a.nested.value).toBe(step < 3 ? 42 : 24);
+	expect(a.nested.a).toBe(step < 3 ? "a" : undefined);
+	expect(a.b).toBe(step < 1 ? "b" : undefined);
+	expect(a.nested.b).toBe(step < 1 ? "b" : undefined);
+	expect(a.c).toBe(step < 1 ? undefined : "c");
+	expect(a.nested.c).toBe(step < 1 || step >= 3 ? undefined : "c");
+	if (step !== 0) {
+		expect(STATE.random === a.random).toBe(step === 2);
+	}
+	STATE.random = a.random;
+});

test/watchCases/cache/loader-import-module/0/loader.js

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+exports.pitch = async function (remaining) {
+	const result = await this.importModule(
+		`${this.resourcePath}.webpack[javascript/auto]!=!${remaining}`
+	);
+	return JSON.stringify(result, null, 2);
+};

test/watchCases/cache/loader-import-module/0/unrelated.js

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+export const value = 42;

test/watchCases/cache/loader-import-module/1/imported.js

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+export const a = "a";
+export const c = "c";

test/watchCases/cache/loader-import-module/2/unrelated.js

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+export const value = 24;

test/watchCases/cache/loader-import-module/3/b.generate-json.js

@@ -0,0 +1 @@
+export const value = 24;

test/watchCases/cache/loader-import-module/webpack.config.js

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+/** @type {import("../../../../").Configuration} */
+module.exports = {
+	module: {
+		rules: [
+			{
+				test: /\.generate-json\.js$/,
+				use: "./loader",
+				type: "json"
+			}
+		]
+	}
+};