contracts/stream_contract: update stream storage tests only

contracts/stream_contract/src/test.rs

@@ -63,6 +63,8 @@ fn test_create_multiple_streams_increments_counter() {
 
     assert_eq!(stream_id1, 1);
     assert_eq!(stream_id2, 2);
+    assert!(client.get_stream(&stream_id1).is_some());
+    assert!(client.get_stream(&stream_id2).is_some());
 }
 
 #[test]
@@ -158,6 +160,8 @@ fn test_top_up_stream_invalid_amount() {
 
     let contract_id = env.register(StreamContract, ());
     let client = StreamContractClient::new(&env, &contract_id);
+    let token_client = token::Client::new(&env, &token_address);
+    token_client.approve(&sender, &contract_id, &20_000, &1_000_000);
 
     let stream_id = client.create_stream(&sender, &recipient, &token_address, &10_000, &100);
 
@@ -219,6 +223,8 @@ fn test_top_up_stream_inactive() {
 
     let contract_id = env.register(StreamContract, ());
     let client = StreamContractClient::new(&env, &contract_id);
+    let token_client = token::Client::new(&env, &token_address);
+    token_client.approve(&sender, &contract_id, &20_000, &1_000_000);
 
     let stream_id = client.create_stream(&sender, &recipient, &token_address, &10_000, &100);
     client.cancel_stream(&sender, &stream_id);