firebase-perf: Apply Legacy Looper mode for some TransportManagerTest tests

Looks like some tests of TransportManagerTest are flaky, and from local
experience Legacy Looper mode might can help it.

Signed-off-by: utzcoz <[email protected]>

Author: utzcoz

firebase-perf/src/test/java/com/google/firebase/perf/transport/TransportManagerTest.java

@@ -68,6 +68,7 @@
 import org.mockito.verification.VerificationMode;
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.annotation.Config;
+import org.robolectric.annotation.LooperMode;
 import org.robolectric.shadows.ShadowPackageManager;
 
 /** Unit tests for {@link TransportManager}. */
@@ -151,6 +152,7 @@ public void validNetworkMetric_transportNotInitialized_getLoggedAfterInitializat
   }
 
   @Test
+  @LooperMode(LooperMode.Mode.LEGACY)
   public void validGaugeMetric_transportNotInitialized_getLoggedAfterInitialization() {
     initializeTransport(false);
     GaugeMetric validGauge = createValidGaugeMetric();
@@ -1145,6 +1147,7 @@ public void logNetworkMetric_globalCustomAttributesAreAdded() {
   }
 
   @Test
+  @LooperMode(LooperMode.Mode.LEGACY)
   public void logGaugeMetric_globalCustomAttributesAreNotAdded() {
     FirebasePerformance.getInstance().putAttribute("test_key1", "test_value1");
     FirebasePerformance.getInstance().putAttribute("test_key2", "test_value2");