--- a/tests/src/.outdated/substrate/substrate-api.ts
+++ b/tests/src/.outdated/substrate/substrate-api.ts
@@ -71,6 +71,7 @@
 
 export async function getApiConnection(settings: ApiOptions | undefined = undefined): Promise<ApiPromise> {
   settings = settings || defaultApiOptions();
+  if(!settings.provider) throw new Error('provider was not set');
   const api = new ApiPromise(settings);
 
   if (api) {
--- a/tests/src/eth/createCollection.test.ts
+++ b/tests/src/eth/createCollection.test.ts
@@ -217,7 +217,8 @@
       const collection = helper.nft.getCollectionObject(collectionId);
       const data = (await collection.getData())!;
 
-      expect(collectionCountAfter - collectionCountBefore).to.be.eq(1);
+      // Parallel test safety
+      expect(collectionCountAfter - collectionCountBefore).to.be.gte(1);
       expect(collectionId).to.be.eq(collectionCountAfter);
       expect(data.name).to.be.eq(name);
       expect(data.description).to.be.eq(description);
--- a/tests/src/util/playgrounds/unique.dev.ts
+++ b/tests/src/util/playgrounds/unique.dev.ts
@@ -278,6 +278,7 @@
   }
 
   async connect(wsEndpoint: string, _listeners?: any): Promise<void> {
+    if(!wsEndpoint) throw new Error('wsEndpoint was not set');
     const wsProvider = new WsProvider(wsEndpoint);
     this.api = new ApiPromise({
       provider: wsProvider,
--- a/tests/src/util/playgrounds/unique.ts
+++ b/tests/src/util/playgrounds/unique.ts
@@ -492,6 +492,7 @@
   }
 
   static async detectNetworkByWsEndpoint(wsEndpoint: string): Promise<TNetworks> {
+    if(!wsEndpoint) throw new Error('wsEndpoint was not set');
     const api = new ApiPromise({provider: new WsProvider(wsEndpoint)});
     await api.isReady;
 
@@ -507,6 +508,7 @@
     network: TNetworks;
   }> {
     if(typeof network === 'undefined' || network === null) network = 'opal';
+    if(!wsEndpoint) throw new Error('wsEndpoint was not set');
     const supportedRPC = {
       opal: {
         unique: require('@unique-nft/opal-testnet-types/definitions').unique.rpc,