Update tests.yml

Author: gagdiez

.github/workflows/tests.yml

@@ -24,11 +24,11 @@ jobs:
         run: cd integration-tests && cargo run --example integration-tests
       - name: Run unit tests
         run: >
-             cd market-contract && cargo test
-             cd ../nft-contract && cargo test
-             cd ../nft-contract-approval && cargo test
-             cd ../nft-contract-basic && cargo test
-             cd ../nft-contract-events && cargo test
-             cd ../nft-contract-royalty && cargo test
-             cd ../nft-contract-skeleton && cargo test
+             cd market-contract && cargo test &&
+             cd ../nft-contract && cargo test &&
+             cd ../nft-contract-approval && cargo test &&
+             cd ../nft-contract-basic && cargo test &&
+             cd ../nft-contract-events && cargo test &&
+             cd ../nft-contract-royalty && cargo test &&
+             cd ../nft-contract-skeleton && cargo test &&
              cd ../nft-series && cargo test