Fix android tests

Author: mrober

firebase-sessions/src/androidTest/kotlin/com/google/firebase/sessions/FirebaseSessionsTests.kt

@@ -20,12 +20,10 @@ import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import com.google.common.truth.Truth.assertThat
 import com.google.firebase.Firebase
-import com.google.firebase.FirebaseApp
 import com.google.firebase.FirebaseOptions
 import com.google.firebase.initialize
 import com.google.firebase.sessions.settings.SessionsSettings
-import org.junit.After
-import org.junit.Before
+import org.junit.BeforeClass
 import org.junit.Test
 import org.junit.runner.RunWith
 
@@ -36,23 +34,6 @@ import org.junit.runner.RunWith
  */
 @RunWith(AndroidJUnit4::class)
 class FirebaseSessionsTests {
-  @Before
-  fun setUp() {
-    Firebase.initialize(
-      ApplicationProvider.getApplicationContext(),
-      FirebaseOptions.Builder()
-        .setApplicationId(APP_ID)
-        .setApiKey(API_KEY)
-        .setProjectId(PROJECT_ID)
-        .build()
-    )
-  }
-
-  @After
-  fun cleanUp() {
-    FirebaseApp.clearInstancesForTest()
-  }
-
   @Test
   fun firebaseSessionsDoesInitialize() {
     assertThat(FirebaseSessions.instance).isNotNull()
@@ -69,5 +50,18 @@ class FirebaseSessionsTests {
     private const val APP_ID = "1:1:android:1a"
     private const val API_KEY = "API-KEY-API-KEY-API-KEY-API-KEY-API-KEY"
     private const val PROJECT_ID = "PROJECT-ID"
+
+    @BeforeClass
+    @JvmStatic
+    fun setUp() {
+      Firebase.initialize(
+        ApplicationProvider.getApplicationContext(),
+        FirebaseOptions.Builder()
+          .setApplicationId(APP_ID)
+          .setApiKey(API_KEY)
+          .setProjectId(PROJECT_ID)
+          .build(),
+      )
+    }
   }
 }