diff --git a/core/tests/Drupal/Tests/Core/Template/TwigExtensionTest.php b/core/tests/Drupal/Tests/Core/Template/TwigExtensionTest.php
index 4e790d8..7b359de 100644
--- a/core/tests/Drupal/Tests/Core/Template/TwigExtensionTest.php
+++ b/core/tests/Drupal/Tests/Core/Template/TwigExtensionTest.php
@@ -100,7 +100,7 @@ public function testEscaping($template, $expected) {
     ]);
     $twig->addExtension($this->systemUnderTest);
 
-    $name = sprintf('__string_template__%s', hash('sha256', uniqid(mt_rand(), TRUE), FALSE));
+    $name = '__string_template_test__';
     $nodes = $twig->parse($twig->tokenize(new \Twig_Source($template, $name)));
 
     $this->assertSame($expected, $nodes->getNode('body')
@@ -155,7 +155,7 @@ public function testActiveTheme() {
       ->method('getActiveTheme')
       ->willReturn($active_theme);
 
-    $name = sprintf('__string_template__%s', hash('sha256', uniqid(mt_rand(), TRUE), FALSE));
+    $name = '__string_template_test__';
     $loader = new \Twig_Loader_Array([$name => '{{ active_theme() }}']);
     $twig = new \Twig_Environment($loader);
     $twig->addExtension($this->systemUnderTest);
@@ -193,7 +193,7 @@ public function testActiveThemePath() {
       ->method('getActiveTheme')
       ->willReturn($active_theme);
 
-    $name = sprintf('__string_template__%s', hash('sha256', uniqid(mt_rand(), TRUE), FALSE));
+    $name = '__string_template_test__';
     $loader = new \Twig_Loader_Array([$name => '{{ active_theme_path() }}']);
     $twig = new \Twig_Environment($loader);
     $twig->addExtension($this->systemUnderTest);
@@ -355,7 +355,7 @@ public function testRenderVarWithGeneratedLink() {
    * @covers ::createAttribute
    */
   public function testCreateAttribute() {
-    $name = sprintf('__string_template__%s', hash('sha256', uniqid(mt_rand(), TRUE), FALSE));
+    $name = '__string_template_test_1__';
     $loader = new \Twig_Loader_Array([$name => "{% for iteration in iterations %}<div{{ create_attribute(iteration) }}></div>{% endfor %}"]);
     $twig = new \Twig_Environment($loader);
     $twig->addExtension($this->systemUnderTest);
@@ -370,7 +370,7 @@ public function testCreateAttribute() {
     $this->assertEquals($expected, $result);
 
     // Test default creation of empty attribute object and using its method.
-    $name = sprintf('__string_template__%s', hash('sha256', uniqid(mt_rand(), TRUE), FALSE));
+    $name = '__string_template_test_2__';
     $loader = new \Twig_Loader_Array(array($name => "<div{{ create_attribute().addClass('meow') }}></div>"));
     $twig->setLoader($loader);
     $result = $twig->render($name);