tests: added test for imported classes usage

Author: arteevraina

integration_tests/CMakeLists.txt

@@ -798,6 +798,9 @@ RUN(NAME callback_03       LABELS cpython llvm c)
 
 RUN(NAME lambda_01         LABELS cpython llvm)
 
+RUN(NAME transaction_01    LABELS cpython llvm c)
+RUN(NAME transaction_02    LABELS cpython llvm c)
+
 # callback_04 is to test emulation. So just run with cpython
 RUN(NAME callback_04       IMPORT_PATH .. LABELS cpython)
 

integration_tests/transaction_01.py

@@ -0,0 +1,10 @@
+from lpython import dataclass
+
+@dataclass
+class Transaction:
+    date: str
+    name: str
+
+@dataclass
+class Transactions:
+    transactions: list[Transaction]

integration_tests/transaction_02.py

@@ -0,0 +1,4 @@
+from transaction_01 import Transactions, Transaction
+
+transactions: list[Transaction] = []
+asr: Transactions = Transactions(transactions=transactions)