diff --git a/spec/libsass-todo-issues/issue_151/expected_output.css b/spec/libsass-todo-issues/issue_151/expected_output.css
new file mode 100644
index 0000000000..be9aebf06e
--- /dev/null
+++ b/spec/libsass-todo-issues/issue_151/expected_output.css
@@ -0,0 +1,20 @@
+div.colors {
+  background: gray;
+  background: saturate(red);
+  background: cyan;
+  background: 1;
+  color: #666666;
+  color: saturate(#369);
+  color: #cc9966;
+  color: 1;
+}
+
+div.numbers {
+  filter: grayscale(30%);
+  filter: saturate(30%);
+  filter: invert(30%);
+  -webkit-filter: grayscale(0.3);
+  -webkit-filter: saturate(0.3);
+  -webkit-filter: invert(0.3);
+}
+
diff --git a/spec/libsass-todo-issues/issue_151/input.scss b/spec/libsass-todo-issues/issue_151/input.scss
new file mode 100644
index 0000000000..d2e764736a
--- /dev/null
+++ b/spec/libsass-todo-issues/issue_151/input.scss
@@ -0,0 +1,19 @@
+div.colors {
+  background: grayscale(red);
+  background: saturate(red);
+  background: invert(red);
+  background: alpha(red);
+  color: grayscale(#369);
+  color: saturate(#369);
+  color: invert(#369);
+  color: alpha(#369);
+}
+
+div.numbers {
+  filter: grayscale(30%);
+  filter: saturate(30%);
+  filter: invert(30%);
+  -webkit-filter: grayscale(0.3);
+  -webkit-filter: saturate(0.3);
+  -webkit-filter: invert(0.3);
+}