diff --git a/schema/schema.spec.ts b/schema/schema.spec.ts
index 5f534a0..a087824 100644
--- a/schema/schema.spec.ts
+++ b/schema/schema.spec.ts
@@ -79,7 +79,7 @@ const cases: [string, TestCase][] = files
   .filter(([f, t]) => {
     if (t.skip) skipped.push([f, t]);
     if (t.invalid) invalid.push([f, t]);
-    return !t.skip && !t.invalid;
+    return !t.skip && !t.invalid && t.myst !== undefined;
   });
 
 describe('Valid Schema Tests', () => {