diff --git a/samples/client/petstore/php/OpenAPIClient-php/tests/EnumTestTest.php b/samples/client/petstore/php/OpenAPIClient-php/tests/EnumTestTest.php
index e1111d1223c..9cf55bd66de 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/tests/EnumTestTest.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/tests/EnumTestTest.php
@@ -11,9 +11,13 @@ class EnumTestTest extends TestCase
     {
         $this->assertSame(EnumTest::ENUM_STRING_UPPER, "UPPER");
         $this->assertSame(EnumTest::ENUM_STRING_LOWER, "lower");
-        $this->assertSame(EnumTest::ENUM_INTEGER_1, 1);
+        $this->assertSame(EnumTest::ENUM_STRING_EMPTY, "");
+        $this->assertSame(EnumTest::ENUM_STRING_REQUIRED_UPPER, "UPPER");
+        $this->assertSame(EnumTest::ENUM_STRING_REQUIRED_LOWER, "lower");
+        $this->assertSame(EnumTest::ENUM_STRING_REQUIRED_EMPTY, "");
+        $this->assertSame(EnumTest::ENUM_INTEGER_NUMBER_1, 1);
         $this->assertSame(EnumTest::ENUM_INTEGER_MINUS_1, -1);
-        $this->assertSame(EnumTest::ENUM_NUMBER_1_DOT_1, 1.1);
+        $this->assertSame(EnumTest::ENUM_NUMBER_NUMBER_1_DOT_1, 1.1);
         $this->assertSame(EnumTest::ENUM_NUMBER_MINUS_1_DOT_2, -1.2);
     }