diff --git a/Core/tests/Unit/ServiceBuilderTest.php b/Core/tests/Unit/ServiceBuilderTest.php
index 3667628bb29..494d65fb418 100644
--- a/Core/tests/Unit/ServiceBuilderTest.php
+++ b/Core/tests/Unit/ServiceBuilderTest.php
@@ -20,7 +20,6 @@
 use Google\Cloud\Core\ServiceBuilder;
 use Google\Cloud\Core\Testing\CheckForClassTrait;
 use Google\Cloud\Core\Testing\GrpcTestTrait;
-use Google\Cloud\Datastore\DatastoreClient;
 use Google\Cloud\Firestore\FirestoreClient;
 use Google\Cloud\Language\LanguageClient;
 use Google\Cloud\Logging\LoggingClient;
@@ -161,9 +160,6 @@ public function serviceProvider()
             [
                 'bigQuery',
                 BigQueryClient::class
-            ], [
-                'datastore',
-                DatastoreClient::class
             ], [
                 'firestore',
                 FirestoreClient::class,
diff --git a/Datastore/tests/Unit/DatastoreClientTest.php b/Datastore/tests/Unit/DatastoreClientTest.php
index 2e60bf15916..d7bf1072074 100644
--- a/Datastore/tests/Unit/DatastoreClientTest.php
+++ b/Datastore/tests/Unit/DatastoreClientTest.php
@@ -23,6 +23,7 @@
 use Google\Cloud\Core\RequestHandler;
 use Google\Cloud\Core\Testing\DatastoreOperationRefreshTrait;
 use Google\Cloud\Core\Testing\GrpcTestTrait;
+use Google\Cloud\Core\Testing\Snippet\Fixtures;
 use Google\Cloud\Core\Testing\TestHelpers;
 use Google\Cloud\Core\Timestamp;
 use Google\Cloud\Datastore\Blob;
@@ -30,7 +31,6 @@
 use Google\Cloud\Datastore\Entity;
 use Google\Cloud\Datastore\GeoPoint;
 use Google\Cloud\Datastore\Key;
-use Google\Cloud\Datastore\Query\Aggregation;
 use Google\Cloud\Datastore\Query\AggregationQuery;
 use Google\Cloud\Datastore\Query\AggregationQueryResult;
 use Google\Cloud\Datastore\Query\GqlQuery;
@@ -40,7 +40,6 @@
 use Google\Cloud\Datastore\Transaction;
 use Google\Cloud\Datastore\V1\CommitRequest\Mode;
 use PHPUnit\Framework\TestCase;
-use Prophecy\Argument;
 use Prophecy\PhpUnit\ProphecyTrait;
 
 /**
@@ -63,7 +62,10 @@ class DatastoreClientTest extends TestCase
     public function setUp(): void
     {
         $this->client = TestHelpers::stub(DatastoreClient::class, [
-            ['projectId' => self::PROJECT]
+            [
+                'projectId' => self::PROJECT,
+                'credentials' => Fixtures::KEYFILE_STUB_FIXTURE()
+            ]
         ], [
             'operation'
         ]);
diff --git a/Datastore/tests/Unit/TransactionTest.php b/Datastore/tests/Unit/TransactionTest.php
index a2c404d1dd5..efbc0881dec 100644
--- a/Datastore/tests/Unit/TransactionTest.php
+++ b/Datastore/tests/Unit/TransactionTest.php
@@ -132,38 +132,6 @@ public function testLookup(callable $transaction)
         $this->assertEquals($this->key->keyObject(), $res->key()->keyObject());
     }
 
-    public function testLookupWithReadTime()
-    {
-        $time = new Timestamp(new \DateTime());
-
-        $this->mockSendRequest(
-            'lookup',
-            [
-                'readOptions' => [
-                    'readTime' => $time,
-                    'transaction' => self::TRANSACTION,
-                ],
-                'keys' => [$this->key->keyObject()],
-            ],
-            [
-                'found' => [
-                    [
-                        'entity' => $this->entityArray($this->key)
-                    ]
-                ]
-            ],
-            0
-        );
-
-        $transaction = $this->readOnly;
-        $this->refreshOperation($transaction,$this->requestHandler->reveal(), [
-            'projectId' => self::PROJECT
-        ]);
-
-        $res = $transaction->lookup($this->key, ['readTime' => $time]);
-        $this->assertInstanceOf(Entity::class, $res);
-    }
-
     /**
      * @dataProvider transactionProvider
      */