tests: unflake wheel test, add more logs (#688)

playwright/src/test/java/com/microsoft/playwright/TestPageNetworkSizes.java

@@ -69,6 +69,7 @@ public class TestPageNetworkSizes extends TestBase {
       () -> page.evaluate("async () => fetch('./get').then(r => r.text())"));
     request.get();
     Sizes sizes = response.request().sizes();
+    assertEquals("abc134", response.text());
     assertEquals(6, sizes.responseBodySize);
     assertTrue(sizes.responseHeadersSize > 10);
   }

playwright/src/test/java/com/microsoft/playwright/TestWheel.java

@@ -41,8 +41,8 @@ public class TestWheel extends TestBase {
       "shiftKey", false,
       "altKey", false,
       "metaKey", false);
-    assertEquals(expected, page.evaluate("window.lastEvent"));
     page.waitForFunction("window.scrollY === 100");
+    assertEquals(expected, page.evaluate("window.lastEvent"));
   }
 
   @Test