test: add sleep to try to lower flakyness of test (#8018)

Author: petebacondarwin

packages/wrangler/src/__tests__/api/startDevWorker/BundleController.test.ts

@@ -193,49 +193,47 @@ describe("BundleController", () => {
 			`);
 		});
 
-		test(
-			"custom build",
-			async ({ controller }) => {
-				await seed({
-					"random_dir/index.ts": dedent/* javascript */ `
+		test("custom build", async ({ controller }) => {
+			await seed({
+				"random_dir/index.ts": dedent/* javascript */ `
 				export default {
 					fetch(request, env, ctx) {
 						//comment
 						return new Response("hello custom build")
 					}
 				} satisfies ExportedHandler
 			`,
-				});
-				const config: Partial<StartDevWorkerOptions> = {
-					legacy: {},
-					name: "worker",
-					entrypoint: path.resolve("out.ts"),
-					projectRoot: path.resolve("."),
-					build: {
-						additionalModules: [],
-						processEntrypoint: false,
-						nodejsCompatMode: null,
-						bundle: true,
-						moduleRules: [],
-						custom: {
-							command: "cp random_dir/index.ts out.ts",
-							watch: "random_dir",
-						},
-						define: {},
-						format: "modules",
-						moduleRoot: path.resolve("."),
-						exports: [],
+			});
+			const config: Partial<StartDevWorkerOptions> = {
+				legacy: {},
+				name: "worker",
+				entrypoint: path.resolve("out.ts"),
+				projectRoot: path.resolve("."),
+				build: {
+					additionalModules: [],
+					processEntrypoint: false,
+					nodejsCompatMode: null,
+					bundle: true,
+					moduleRules: [],
+					custom: {
+						command: "cp random_dir/index.ts out.ts",
+						watch: "random_dir",
 					},
-				};
+					define: {},
+					format: "modules",
+					moduleRoot: path.resolve("."),
+					exports: [],
+				},
+			};
 
-				await controller.onConfigUpdate({
-					type: "configUpdate",
-					config: configDefaults(config),
-				});
+			await controller.onConfigUpdate({
+				type: "configUpdate",
+				config: configDefaults(config),
+			});
 
-				let ev = await waitForBundleComplete(controller);
-				expect(findSourceFile(ev.bundle.entrypointSource, "out.ts"))
-					.toMatchInlineSnapshot(`
+			let ev = await waitForBundleComplete(controller);
+			expect(findSourceFile(ev.bundle.entrypointSource, "out.ts"))
+				.toMatchInlineSnapshot(`
 				"// out.ts
 				var out_default = {
 				  fetch(request, env, ctx) {
@@ -244,19 +242,23 @@ describe("BundleController", () => {
 				};
 				"
 			`);
-				await seed({
-					"random_dir/index.ts": dedent/* javascript */ `
+
+			// Wait for a bit before we make a new change to the watched file
+			await sleep(500);
+
+			await seed({
+				"random_dir/index.ts": dedent/* javascript */ `
 					export default {
 						fetch(request, env, ctx) {
 							//comment
 							return new Response("hello custom build 2")
 						}
 					}
 				`,
-				});
-				ev = await waitForBundleComplete(controller);
-				expect(findSourceFile(ev.bundle.entrypointSource, "out.ts"))
-					.toMatchInlineSnapshot(`
+			});
+			ev = await waitForBundleComplete(controller);
+			expect(findSourceFile(ev.bundle.entrypointSource, "out.ts"))
+				.toMatchInlineSnapshot(`
 				"// out.ts
 				var out_default = {
 				  fetch(request, env, ctx) {
@@ -265,10 +267,7 @@ describe("BundleController", () => {
 				};
 				"
 			`);
-			},
-			// Extend this test's timeout as it keeps flaking on CI
-			{ timeout: 30_000 }
-		);
+		});
 	});
 
 	test("module aliasing", async ({ controller }) => {
@@ -575,3 +574,7 @@ describe("BundleController", () => {
 		});
 	});
 });
+
+function sleep(ms: number) {
+	return new Promise((resolve) => setTimeout(resolve, ms));
+}