added opt in to tests

Author: David Motsonashvili

firebase-vertexai/src/test/java/com/google/firebase/vertexai/UnarySnapshotTests.kt

@@ -16,6 +16,7 @@
 
 package com.google.firebase.vertexai
 
+import com.google.firebase.vertexai.common.PublicPreviewAPI
 import com.google.firebase.vertexai.type.BlockReason
 import com.google.firebase.vertexai.type.ContentBlockedException
 import com.google.firebase.vertexai.type.FinishReason
@@ -54,6 +55,7 @@ import kotlinx.serialization.json.jsonPrimitive
 import org.json.JSONArray
 import org.junit.Test
 
+@OptIn(PublicPreviewAPI::class)
 internal class UnarySnapshotTests {
   private val testTimeout = 5.seconds
 

firebase-vertexai/src/test/java/com/google/firebase/vertexai/util/tests.kt

@@ -14,11 +14,14 @@
  * limitations under the License.
  */
 
+@file:OptIn(PublicPreviewAPI::class)
+
 package com.google.firebase.vertexai.util
 
 import com.google.firebase.vertexai.GenerativeModel
 import com.google.firebase.vertexai.ImagenModel
 import com.google.firebase.vertexai.common.APIController
+import com.google.firebase.vertexai.common.PublicPreviewAPI
 import com.google.firebase.vertexai.type.RequestOptions
 import io.kotest.matchers.collections.shouldNotBeEmpty
 import io.kotest.matchers.nulls.shouldNotBeNull