1 files changed, 3 insertions, 1 deletions
diff --git a/php/tests/well_known_test.php b/php/tests/well_known_test.php
index 1e8c4f42..6a788df2 100644
--- a/php/tests/well_known_test.php
+++ b/php/tests/well_known_test.php
@@ -42,6 +42,7 @@ class WellKnownTest extends TestBase {
     public function testEmpty()
     {
         $msg = new GPBEmpty();
+        $this->assertTrue($msg instanceof \Google\Protobuf\Internal\Message);
     }
 
     public function testImportDescriptorProto()
@@ -312,11 +313,12 @@ class WellKnownTest extends TestBase {
         $from = new DateTime('2011-01-01T15:03:01.012345UTC');
         $timestamp->fromDateTime($from);
         $this->assertEquals($from->format('U'), $timestamp->getSeconds());
-        $this->assertSame(0, $timestamp->getNanos());
+        $this->assertEquals(1000 * $from->format('u'), $timestamp->getNanos());
 
         $to = $timestamp->toDateTime();
         $this->assertSame(\DateTime::class, get_class($to));
         $this->assertSame($from->format('U'), $to->format('U'));
+        $this->assertSame($from->format('u'), $to->format('u'));
     }
 
     public function testType()