diff --git a/tests/Phug/Adapter/FileAdapterTest.php b/tests/Phug/Adapter/FileAdapterTest.php
index c728497..86df144 100644
--- a/tests/Phug/Adapter/FileAdapterTest.php
+++ b/tests/Phug/Adapter/FileAdapterTest.php
@@ -509,6 +509,37 @@ public function testCacheErrorTrace()
         static::emptyDirectory($directory);
     }
 
+    /**
+     * @covers \Phug\Renderer\Adapter\FileAdapter::<public>
+     * @covers \Phug\Renderer\Adapter\FileAdapter::cache
+     * @covers \Phug\Renderer\Adapter\FileAdapter::cacheFileContents
+     */
+    public function testCacheRenderString()
+    {
+        $directory = sys_get_temp_dir().'/pug'.mt_rand(0, 99999999);
+        static::emptyDirectory($directory);
+        if (!file_exists($directory)) {
+            mkdir($directory);
+        }
+        $options = [
+            'debug'         => true,
+            'cache_dir'     => $directory,
+        ];
+        $lastError = null;
+        $renderer = new Renderer($options);
+
+
+        $html = $renderer->render('p Hello');
+
+        self::assertSame('<p>Hello</p>', $html);
+
+        $html = $renderer->render('div Bye');
+
+        self::assertSame('<div>Bye</div>', $html);
+
+        static::emptyDirectory($directory);
+    }
+
     /**
      * @covers                \Phug\Renderer\Partial\FileSystemTrait::scanDirectory
      * @covers                \Phug\Renderer\Partial\CacheTrait::getCacheAdapter
diff --git a/tests/Phug/RendererTest.php b/tests/Phug/RendererTest.php
index 30d53d0..9c4fdfa 100644
--- a/tests/Phug/RendererTest.php
+++ b/tests/Phug/RendererTest.php
@@ -1018,7 +1018,8 @@ public function testExtendsUndefinedCall()
         }
 
         $renderer = new Renderer([
-            'pretty' => true,
+            'color_support' => false,
+            'pretty'        => true,
         ]);
 
         $renderer->renderFile(__DIR__.'/../call-undefined/extends-call-undefined.pug');
@@ -1037,7 +1038,8 @@ public function testUndefinedCallInBlock()
         }
 
         $renderer = new Renderer([
-            'pretty' => true,
+            'color_support' => false,
+            'pretty'        => true,
         ]);
 
         $renderer->renderFile(__DIR__.'/../call-undefined/call-undefined-in-block.pug');
@@ -1119,4 +1121,22 @@ public function testConsecutiveRenders()
 
         $this->assertSameLines(file_get_contents(__DIR__.'/../cases/comments.html'), $html);
     }
+
+    /**
+     * @throws RendererException
+     */
+    public function testConsecutiveStringRenders()
+    {
+        $renderer = new Renderer([
+            'debug' => false,
+        ]);
+
+        $html = $renderer->render('p Hello');
+
+        $this->assertSameLines('<p>Hello</p>', $html);
+
+        $html = $renderer->render('div Bye');
+
+        $this->assertSameLines('<div>Bye</div>', $html);
+    }
 }