diff --git a/tests/test-global.twig b/tests/test-global.twig
index ff326cb..54baba8 100644
--- a/tests/test-global.twig
+++ b/tests/test-global.twig
@@ -11,3 +11,11 @@ global_var = {{ global_var }}
 {{ 'meow'|test_filter }}
 {{ test_function('the') }}
 {{ 'test' is test_test ? 'test works' : 'test does not work' }}
+
+{{ 'Mewow'|data_uri(mime="text/plain") }}
+{{ 'Mewow'|data_uri(mime="application/octet-stream") }}
+
+<div class="{{ html_classes('always', {
+    'shows-up': true,
+    'doesnt': false,
+}) }}">yay</div>
diff --git a/tests/test-loaded-render.html b/tests/test-loaded-render.html
index e997be0..76451e7 100644
--- a/tests/test-loaded-render.html
+++ b/tests/test-loaded-render.html
@@ -11,6 +11,11 @@ filter:meow
 func:the
 test works
 
+data:text/plain,Mewow
+data:application/octet-stream;base64,TWV3b3c=
+
+<div class="always shows-up">yay</div>
+
 this var is context
 simple set call
 applied with fuckery
diff --git a/tests/test-loaded-string.html b/tests/test-loaded-string.html
index 71cb5d6..c7a0434 100644
--- a/tests/test-loaded-string.html
+++ b/tests/test-loaded-string.html
@@ -11,6 +11,11 @@ filter:meow
 func:the
 test works
 
+data:text/plain,Mewow
+data:application/octet-stream;base64,TWV3b3c=
+
+<div class="always shows-up">yay</div>
+
 this var is context
 simple set call
 applied with fuckery
diff --git a/tests/test-rendered.html b/tests/test-rendered.html
index d75f623..2ac3baa 100644
--- a/tests/test-rendered.html
+++ b/tests/test-rendered.html
@@ -11,4 +11,9 @@ filter:meow
 func:the
 test works
 
+data:text/plain,Mewow
+data:application/octet-stream;base64,TWV3b3c=
+
+<div class="always shows-up">yay</div>
+
 this var is local