WIP: add tests for enable extension parsing

Author: ErichDonGubler

naga/src/front/wgsl/parse/directive/enable_extension.rs

@@ -141,3 +141,15 @@ impl UnimplementedEnableExtension {
         }
     }
 }
+#[cfg(test)]
+mod test {
+    use strum::IntoEnumIterator as _;
+
+    use super::ImplementedEnableExtension;
+
+    fn valid() {
+        for extension in ImplementedEnableExtension::iter() {}
+    }
+
+    fn unimplemented() {}
+}