diff --git a/tests/special-functions.rs b/tests/special-functions.rs
index 5f22f5f..b3ed40b 100644
--- a/tests/special-functions.rs
+++ b/tests/special-functions.rs
@@ -64,6 +64,11 @@ test!(
     "a {\n  color: calc('a');\n}\n",
     "a {\n  color: calc(\"a\");\n}\n"
 );
+test!(
+    calc_hash_no_interpolation,
+    "a {\n  color: calc(#);\n}\n",
+    "a {\n  color: calc(#);\n}\n"
+);
 test!(
     element_whitespace,
     "a {\n  color: element(       1      );\n}\n",
diff --git a/tests/url.rs b/tests/url.rs
index 9331327..bc97b61 100644
--- a/tests/url.rs
+++ b/tests/url.rs
@@ -142,6 +142,11 @@ test!(
     "a {\n  color: -webkit-url(https://google.com);\n}\n",
     "a {\n  color: url(https://google.com);\n}\n"
 );
+test!(
+    url_hash_no_interpolation,
+    "a {\n  color: url(#);\n}\n",
+    "a {\n  color: url(#);\n}\n"
+);
 error!(
     url_nothing_after_forward_slash_in_interpolation,
     "a { color: url(#{/", "Error: Expected expression."