chore: add tests to block "s-a-dev" in subdomain names

tests/domains.test.js

@@ -102,3 +102,15 @@ t("Users are limited to one single character subdomain", (t) => {
 
     t.pass();
 });
+
+t("Subdomain names should not contain 'is-a-dev'", (t) => {
+    files.forEach((file) => {
+        const subdomain = file.replace(/\.json$/, "");
+        const baseName = subdomain.split(".").pop();
+
+        t.false(
+            baseName.toLowerCase().includes("is-a-dev"),
+            `${file}: Subdomain name cannot contain 'is-a-dev'`
+        );
+    });
+});