chore(tests): async await instead of setTimeout (#496)

test/metrics/eventLoopLagTest.js

@@ -16,53 +16,57 @@ describe('eventLoopLag', () => {
 		expect(await register.getMetricsAsJSON()).toHaveLength(0);
 		eventLoopLag();
 
-		setTimeout(async () => {
-			const metrics = await register.getMetricsAsJSON();
-			expect(metrics).toHaveLength(8);
-
-			expect(metrics[0].help).toEqual('Lag of event loop in seconds.');
-			expect(metrics[0].type).toEqual('gauge');
-			expect(metrics[0].name).toEqual('nodejs_eventloop_lag_seconds');
-
-			expect(metrics[1].help).toEqual('The minimum recorded event loop delay.');
-			expect(metrics[1].type).toEqual('gauge');
-			expect(metrics[1].name).toEqual('nodejs_eventloop_lag_min_seconds');
-
-			expect(metrics[2].help).toEqual('The maximum recorded event loop delay.');
-			expect(metrics[2].type).toEqual('gauge');
-			expect(metrics[2].name).toEqual('nodejs_eventloop_lag_max_seconds');
-
-			expect(metrics[3].help).toEqual(
-				'The mean of the recorded event loop delays.',
-			);
-			expect(metrics[3].type).toEqual('gauge');
-			expect(metrics[3].name).toEqual('nodejs_eventloop_lag_mean_seconds');
-
-			expect(metrics[4].help).toEqual(
-				'The standard deviation of the recorded event loop delays.',
-			);
-			expect(metrics[4].type).toEqual('gauge');
-			expect(metrics[4].name).toEqual('nodejs_eventloop_lag_stddev_seconds');
-
-			expect(metrics[5].help).toEqual(
-				'The 50th percentile of the recorded event loop delays.',
-			);
-			expect(metrics[5].type).toEqual('gauge');
-			expect(metrics[5].name).toEqual('nodejs_eventloop_lag_p50_seconds');
-
-			expect(metrics[6].help).toEqual(
-				'The 90th percentile of the recorded event loop delays.',
-			);
-			expect(metrics[6].type).toEqual('gauge');
-			expect(metrics[6].name).toEqual('nodejs_eventloop_lag_p90_seconds');
-
-			expect(metrics[7].help).toEqual(
-				'The 99th percentile of the recorded event loop delays.',
-			);
-			expect(metrics[7].type).toEqual('gauge');
-			expect(metrics[7].name).toEqual('nodejs_eventloop_lag_p99_seconds');
-
-			done();
-		}, 5);
+		await wait(5);
+
+		const metrics = await register.getMetricsAsJSON();
+		expect(metrics).toHaveLength(8);
+
+		expect(metrics[0].help).toEqual('Lag of event loop in seconds.');
+		expect(metrics[0].type).toEqual('gauge');
+		expect(metrics[0].name).toEqual('nodejs_eventloop_lag_seconds');
+
+		expect(metrics[1].help).toEqual('The minimum recorded event loop delay.');
+		expect(metrics[1].type).toEqual('gauge');
+		expect(metrics[1].name).toEqual('nodejs_eventloop_lag_min_seconds');
+
+		expect(metrics[2].help).toEqual('The maximum recorded event loop delay.');
+		expect(metrics[2].type).toEqual('gauge');
+		expect(metrics[2].name).toEqual('nodejs_eventloop_lag_max_seconds');
+
+		expect(metrics[3].help).toEqual(
+			'The mean of the recorded event loop delays.',
+		);
+		expect(metrics[3].type).toEqual('gauge');
+		expect(metrics[3].name).toEqual('nodejs_eventloop_lag_mean_seconds');
+
+		expect(metrics[4].help).toEqual(
+			'The standard deviation of the recorded event loop delays.',
+		);
+		expect(metrics[4].type).toEqual('gauge');
+		expect(metrics[4].name).toEqual('nodejs_eventloop_lag_stddev_seconds');
+
+		expect(metrics[5].help).toEqual(
+			'The 50th percentile of the recorded event loop delays.',
+		);
+		expect(metrics[5].type).toEqual('gauge');
+		expect(metrics[5].name).toEqual('nodejs_eventloop_lag_p50_seconds');
+
+		expect(metrics[6].help).toEqual(
+			'The 90th percentile of the recorded event loop delays.',
+		);
+		expect(metrics[6].type).toEqual('gauge');
+		expect(metrics[6].name).toEqual('nodejs_eventloop_lag_p90_seconds');
+
+		expect(metrics[7].help).toEqual(
+			'The 99th percentile of the recorded event loop delays.',
+		);
+		expect(metrics[7].type).toEqual('gauge');
+		expect(metrics[7].name).toEqual('nodejs_eventloop_lag_p99_seconds');
+
+		done();
 	});
 });
+
+async function wait(ms) {
+	await new Promise(resolve => setTimeout(resolve, ms));
+}