diff --git a/tests/unit/Core/GPBGrpcRequestWrapperTest.php b/tests/unit/Core/GPBGrpcRequestWrapperTest.php
index bca540e613d9..b965e2dda5f4 100644
--- a/tests/unit/Core/GPBGrpcRequestWrapperTest.php
+++ b/tests/unit/Core/GPBGrpcRequestWrapperTest.php
@@ -65,6 +65,9 @@ function ($test, $options) use ($response, $requestOptions) {
 
     public function responseProvider()
     {
+        if ($this->shouldSkipGrpcTests()) {
+            return [];
+        }
         $expectedMessage = ['successful' => 'request'];
         $message = $this->prophesize(Message::class);
         $serializer = $this->prophesize(Serializer::class);
diff --git a/tests/unit/Spanner/BytesTest.php b/tests/unit/Spanner/BytesTest.php
index d91b19ccfd34..324456c1c678 100644
--- a/tests/unit/Spanner/BytesTest.php
+++ b/tests/unit/Spanner/BytesTest.php
@@ -18,14 +18,22 @@
 namespace Google\Cloud\Tests\Unit\Spanner;
 
 use Google\Cloud\Spanner\Bytes;
+use Google\Cloud\Tests\GrpcTestTrait;
 
 /**
  * @group spanner
  */
 class BytesTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     private $content = 'hello';
 
+    public function setUp()
+    {
+        $this->checkAndSkipGrpcTests();
+    }
+
     public function testGet()
     {
         $bytes = new Bytes($this->content);
diff --git a/tests/unit/Spanner/DatabaseTest.php b/tests/unit/Spanner/DatabaseTest.php
index 0f5a1a16660f..a4b1ef6cda3f 100644
--- a/tests/unit/Spanner/DatabaseTest.php
+++ b/tests/unit/Spanner/DatabaseTest.php
@@ -36,6 +36,7 @@
 use Google\Cloud\Spanner\Timestamp;
 use Google\Cloud\Spanner\Transaction;
 use Google\Cloud\Spanner\ValueMapper;
+use Google\Cloud\Tests\GrpcTestTrait;
 use Prophecy\Argument;
 
 /**
@@ -43,6 +44,8 @@
  */
 class DatabaseTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     const PROJECT = 'my-awesome-project';
     const DATABASE = 'my-database';
     const INSTANCE = 'my-instance';
@@ -58,6 +61,8 @@ class DatabaseTest extends \PHPUnit_Framework_TestCase
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
+
         $this->connection = $this->prophesize(ConnectionInterface::class);
         $this->instance = $this->prophesize(Instance::class);
         $this->sessionPool = $this->prophesize(SessionPoolInterface::class);
diff --git a/tests/unit/Spanner/DateTest.php b/tests/unit/Spanner/DateTest.php
index 9ccb45b8d717..e7e2034dbf51 100644
--- a/tests/unit/Spanner/DateTest.php
+++ b/tests/unit/Spanner/DateTest.php
@@ -18,17 +18,22 @@
 namespace Google\Cloud\Tests\Unit\Spanner;
 
 use Google\Cloud\Spanner\Date;
+use Google\Cloud\Tests\GrpcTestTrait;
 
 /**
  * @group spanner
  */
 class DateTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     private $dt;
     private $date;
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
+
         $this->dt = new \DateTime('1989-10-11');
         $this->date = new Date($this->dt);
     }
diff --git a/tests/unit/Spanner/InstanceConfigurationTest.php b/tests/unit/Spanner/InstanceConfigurationTest.php
index f8515a4a0d6c..e654d9687439 100644
--- a/tests/unit/Spanner/InstanceConfigurationTest.php
+++ b/tests/unit/Spanner/InstanceConfigurationTest.php
@@ -21,6 +21,7 @@
 use Google\Cloud\Spanner\Admin\Instance\V1\InstanceAdminClient;
 use Google\Cloud\Spanner\InstanceConfiguration;
 use Google\Cloud\Spanner\Connection\ConnectionInterface;
+use Google\Cloud\Tests\GrpcTestTrait;
 use Prophecy\Argument;
 
 /**
@@ -29,6 +30,8 @@
  */
 class InstanceConfigurationTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     const PROJECT_ID = 'test-project';
     const NAME = 'test-config';
 
@@ -37,6 +40,8 @@ class InstanceConfigurationTest extends \PHPUnit_Framework_TestCase
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
+
         $this->connection = $this->prophesize(ConnectionInterface::class);
         $this->configuration = \Google\Cloud\Dev\stub(InstanceConfiguration::class, [
             $this->connection->reveal(),
diff --git a/tests/unit/Spanner/InstanceTest.php b/tests/unit/Spanner/InstanceTest.php
index 7542546fafa7..e313e4dbc95b 100644
--- a/tests/unit/Spanner/InstanceTest.php
+++ b/tests/unit/Spanner/InstanceTest.php
@@ -29,6 +29,7 @@
 use Google\Cloud\Spanner\Database;
 use Google\Cloud\Spanner\Instance;
 use Google\Cloud\Spanner\Session\SessionPoolInterface;
+use Google\Cloud\Tests\GrpcTestTrait;
 use Prophecy\Argument;
 
 /**
@@ -37,6 +38,8 @@
  */
 class InstanceTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     const PROJECT_ID = 'test-project';
     const NAME = 'instance-name';
 
@@ -45,6 +48,8 @@ class InstanceTest extends \PHPUnit_Framework_TestCase
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
+
         $this->connection = $this->prophesize(ConnectionInterface::class);
         $this->instance = \Google\Cloud\Dev\stub(Instance::class, [
             $this->connection->reveal(),
diff --git a/tests/unit/Spanner/KeyRangeTest.php b/tests/unit/Spanner/KeyRangeTest.php
index 0b8703083455..291cd81203d8 100644
--- a/tests/unit/Spanner/KeyRangeTest.php
+++ b/tests/unit/Spanner/KeyRangeTest.php
@@ -18,16 +18,21 @@
 namespace Google\Cloud\Tests\Unit\Spanner;
 
 use Google\Cloud\Spanner\KeyRange;
+use Google\Cloud\Tests\GrpcTestTrait;
 
 /**
  * @group spanner
  */
 class KeyRangeTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     private $range;
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
+
         $this->range = new KeyRange;
     }
 
diff --git a/tests/unit/Spanner/OperationTest.php b/tests/unit/Spanner/OperationTest.php
index e1437da9aebe..90b208c4326c 100644
--- a/tests/unit/Spanner/OperationTest.php
+++ b/tests/unit/Spanner/OperationTest.php
@@ -29,6 +29,7 @@
 use Google\Cloud\Spanner\Timestamp;
 use Google\Cloud\Spanner\Transaction;
 use Google\Cloud\Spanner\ValueMapper;
+use Google\Cloud\Tests\GrpcTestTrait;
 use Prophecy\Argument;
 
 /**
@@ -36,6 +37,8 @@
  */
 class OperationTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     const SESSION = 'my-session-id';
     const TRANSACTION = 'my-transaction-id';
     const DATABASE = 'my-database';
@@ -47,6 +50,8 @@ class OperationTest extends \PHPUnit_Framework_TestCase
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
+
         $this->connection = $this->prophesize(ConnectionInterface::class);
 
         $this->operation = \Google\Cloud\Dev\stub(Operation::class, [
diff --git a/tests/unit/Spanner/SnapshotTest.php b/tests/unit/Spanner/SnapshotTest.php
index e846882c5f9a..db45dd5f553d 100644
--- a/tests/unit/Spanner/SnapshotTest.php
+++ b/tests/unit/Spanner/SnapshotTest.php
@@ -21,6 +21,7 @@
 use Google\Cloud\Spanner\Session\Session;
 use Google\Cloud\Spanner\Snapshot;
 use Google\Cloud\Spanner\Timestamp;
+use Google\Cloud\Tests\GrpcTestTrait;
 use Prophecy\Argument;
 
 /**
@@ -28,11 +29,15 @@
  */
 class SnapshotTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     private $timestamp;
     private $snapshot;
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
+
         $this->timestamp = new Timestamp(new \DateTime);
 
         $args = [
diff --git a/tests/unit/Spanner/TimestampTest.php b/tests/unit/Spanner/TimestampTest.php
index 62d35c94d8f7..dbafb0b24a3f 100644
--- a/tests/unit/Spanner/TimestampTest.php
+++ b/tests/unit/Spanner/TimestampTest.php
@@ -18,17 +18,22 @@
 namespace Google\Cloud\Tests\Unit\Spanner;
 
 use Google\Cloud\Spanner\Timestamp;
+use Google\Cloud\Tests\GrpcTestTrait;
 
 /**
  * @group spanner
  */
 class TimestampTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     private $dt;
     private $ts;
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
+
         $this->dt = new \DateTime('1989-10-11 08:58:00 +00:00');
         $this->ts = new Timestamp($this->dt);
     }
diff --git a/tests/unit/Spanner/TransactionConfigurationTraitTest.php b/tests/unit/Spanner/TransactionConfigurationTraitTest.php
index da1119bb9060..54a2bac77e85 100644
--- a/tests/unit/Spanner/TransactionConfigurationTraitTest.php
+++ b/tests/unit/Spanner/TransactionConfigurationTraitTest.php
@@ -21,12 +21,15 @@
 use Google\Cloud\Spanner\Session\SessionPoolInterface;
 use Google\Cloud\Spanner\Timestamp;
 use Google\Cloud\Spanner\TransactionConfigurationTrait;
+use Google\Cloud\Tests\GrpcTestTrait;
 
 /**
  * @group spanner
  */
 class TransactionConfigurationTraitTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     const TRANSACTION = 'my-transaction';
     const TIMESTAMP = '2017-01-09T18:05:22.534799Z';
     const NANOS = '534799';
@@ -38,6 +41,8 @@ class TransactionConfigurationTraitTest extends \PHPUnit_Framework_TestCase
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
+
         $this->impl = new TransactionConfigurationTraitImplementation;
         $this->ts = new Timestamp(new \DateTime(self::TIMESTAMP), self::NANOS);
         $this->duration = new Duration(10,1);
diff --git a/tests/unit/Spanner/TransactionTest.php b/tests/unit/Spanner/TransactionTest.php
index 744b3d337021..fbbb0d6a923a 100644
--- a/tests/unit/Spanner/TransactionTest.php
+++ b/tests/unit/Spanner/TransactionTest.php
@@ -28,6 +28,7 @@
 use Google\Cloud\Spanner\Timestamp;
 use Google\Cloud\Spanner\Transaction;
 use Google\Cloud\Spanner\ValueMapper;
+use Google\Cloud\Tests\GrpcTestTrait;
 use Prophecy\Argument;
 
 /**
@@ -35,6 +36,8 @@
  */
 class TransactionTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     const TIMESTAMP = '2017-01-09T18:05:22.534799Z';
 
     const PROJECT = 'my-awesome-project';
@@ -53,6 +56,8 @@ class TransactionTest extends \PHPUnit_Framework_TestCase
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
+
         $this->connection = $this->prophesize(ConnectionInterface::class);
         $this->operation = new Operation($this->connection->reveal(), false);
 
diff --git a/tests/unit/Spanner/TransactionTypeTest.php b/tests/unit/Spanner/TransactionTypeTest.php
index 491449f1739b..5c947c558bfd 100644
--- a/tests/unit/Spanner/TransactionTypeTest.php
+++ b/tests/unit/Spanner/TransactionTypeTest.php
@@ -30,6 +30,7 @@
 use Google\Cloud\Spanner\Timestamp;
 use Google\Cloud\Spanner\Transaction;
 use Google\Cloud\Spanner\V1\SpannerClient;
+use Google\Cloud\Tests\GrpcTestTrait;
 use Prophecy\Argument;
 
 /**
@@ -37,6 +38,8 @@
  */
 class TransactionTypeTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+
     use ResultTestTrait;
 
     const PROJECT = 'my-project';
@@ -51,6 +54,8 @@ class TransactionTypeTest extends \PHPUnit_Framework_TestCase
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
+
         $this->timestamp = (new \DateTimeImmutable)->format(Timestamp::FORMAT);
 
         $this->connection = $this->prophesize(ConnectionInterface::class);
diff --git a/tests/unit/Spanner/ValueMapperTest.php b/tests/unit/Spanner/ValueMapperTest.php
index 83f9efcf10a9..e1e02b089df2 100644
--- a/tests/unit/Spanner/ValueMapperTest.php
+++ b/tests/unit/Spanner/ValueMapperTest.php
@@ -24,18 +24,22 @@
 use Google\Cloud\Spanner\Result;
 use Google\Cloud\Spanner\Timestamp;
 use Google\Cloud\Spanner\ValueMapper;
+use Google\Cloud\Tests\GrpcTestTrait;
 
 /**
  * @group spanner
  */
 class ValueMapperTest extends \PHPUnit_Framework_TestCase
 {
+    use GrpcTestTrait;
+    
     const FORMAT_TEST_VALUE = 'abc';
 
     private $mapper;
 
     public function setUp()
     {
+        $this->checkAndSkipGrpcTests();
         $this->mapper = new ValueMapper(false);
     }