fix test failure by updating expected pre-populated messsge count to 1

app/src/androidTest/java/com/google/android/samples/socialite/data/AppDatabaseTest.kt

@@ -46,7 +46,7 @@ class AppDatabaseTest {
         for (detail in chatDetails) {
             assertThat(detail.attendees).hasSize(1)
             val messages = db.messageDao().loadAll(detail.chatWithLastMessage.id)
-            assertThat(messages).hasSize(2)
+            assertThat(messages).hasSize(1)
         }
     }
 }

app/src/androidTest/java/com/google/android/samples/socialite/data/ChatDaoTest.kt

@@ -35,7 +35,7 @@ class ChatDaoTest {
         for (detail in chatDetails) {
             assertThat(detail.attendees).hasSize(1)
             val messages = db.messageDao().loadAll(detail.chatWithLastMessage.id)
-            assertThat(messages).hasSize(2)
+            assertThat(messages).hasSize(1)
         }
     }
 }

app/src/androidTest/java/com/google/android/samples/socialite/repository/ChatRepositoryTest.kt

@@ -46,7 +46,7 @@ class ChatRepositoryTest {
     fun findMessages() = runTest {
         val repository = createTestRepository()
         repository.findMessages(1L).test {
-            assertThat(awaitItem()).hasSize(2)
+            assertThat(awaitItem()).hasSize(1)
         }
     }
 }

app/src/androidTest/java/com/google/android/samples/socialite/ui/chat/ChatViewModelTest.kt

@@ -38,7 +38,7 @@ class ChatViewModelTest {
             assertThat(awaitNotNull().firstContact.name).isEqualTo("Cat")
         }
         viewModel.messages.test {
-            assertThat(awaitNotEmpty()).hasSize(2)
+            assertThat(awaitNotEmpty()).hasSize(1)
         }
     }
 }