Improve cancel in SubscriberInputStreamTests

spring-web/src/test/java/org/springframework/http/client/SubscriberInputStreamTests.java

@@ -133,21 +133,24 @@ class SubscriberInputStreamTests {
 	}
 
 	@Test
-	void cancel() throws InterruptedException, IOException {
-		CountDownLatch latch = new CountDownLatch(1);
+	void cancel() throws Exception {
+		CountDownLatch latch1 = new CountDownLatch(1);
+		CountDownLatch latch2 = new CountDownLatch(1);
 
 		Flow.Publisher<byte[]> publisher = new OutputStreamPublisher<>(
 				out -> {
-					assertThatIOException().isThrownBy(() -> {
-						out.write(FOO);
-						out.flush();
-						out.write(BAR);
-						out.flush();
-						out.write(BAZ);
-						out.flush();
-					}).withMessage("Subscription has been terminated");
-					latch.countDown();
-
+					assertThatIOException()
+							.isThrownBy(() -> {
+								out.write(FOO);
+								out.flush();
+								out.write(BAR);
+								out.flush();
+								latch1.countDown();
+								out.write(BAZ);
+								out.flush();
+							})
+							.withMessage("Subscription has been terminated");
+					latch2.countDown();
 				}, this.byteMapper, this.executor, null);
 
 		List<byte[]> discarded = new ArrayList<>();
@@ -158,10 +161,11 @@ class SubscriberInputStreamTests {
 
 			assertThat(is.read(chunk)).isEqualTo(3);
 			assertThat(chunk).containsExactly(FOO);
-		}
 
-		latch.await();
+			latch1.await();
+		}
 
+		latch2.await();
 		assertThat(discarded).containsExactly("bar".getBytes(UTF_8));
 	}