--- a/tests/src/substrate/substrate-api.ts
+++ b/tests/src/substrate/substrate-api.ts
@@ -22,6 +22,14 @@
   settings = settings || defaultApiOptions();
   let api: ApiPromise = new ApiPromise(settings);
 
+  // TODO: Remove, this is temporary: Filter unneeded API output 
+  // (Jaco promised it will be removed in the next version)
+  const consoleErr = console.error;
+  console.error = (message: string) => {
+    if (message.includes("StorageChangeSet:: WebSocket is not connected") || message.includes("2021-")) {}
+    else consoleErr(message);
+  };
+
   try {
     await promisifySubstrate(api, async () => {
       if(api) {
@@ -31,6 +39,7 @@
     })();
   } finally {
     await api.disconnect();
+    console.error = consoleErr;
   }
 }