Test string contains string

.gitignore

@@ -76,6 +76,9 @@ ENV/
 # IDE
 .vscode/
 
+# System
+.DS_Store
+
 # Dev utils
 dev.py
 dump_golden.py

liquid/golden/if_tag.py

@@ -339,11 +339,38 @@
         error=False,
         strict=False,
     ),
+    Case(
+        description="string contains string",
+        template="{% if 'hello' contains 'llo' %}TRUE{% else %}FALSE{% endif %}",
+        expect="TRUE",
+        globals={},
+        partials={},
+        error=False,
+        strict=False,
+    ),
     Case(
         description="string contains int",
         template="{% if 'hel9lo' contains 9 %}TRUE{% else %}FALSE{% endif %}",
         expect="TRUE",
-        globals={"x": {}},
+        globals={},
+        partials={},
+        error=False,
+        strict=False,
+    ),
+    Case(
+        description="string contains string from context",
+        template="{% if 'hello' contains s %}TRUE{% else %}FALSE{% endif %}",
+        expect="TRUE",
+        globals={"s": "llo"},
+        partials={},
+        error=False,
+        strict=False,
+    ),
+    Case(
+        description="context string contains string from context",
+        template="{% if t contains s %}TRUE{% else %}FALSE{% endif %}",
+        expect="TRUE",
+        globals={"s": "llo", "t": "hello"},
         partials={},
         error=False,
         strict=False,