TEST: Add test for unsupported operand unary op

Author: ubaidsk

tests/errors/test_operator_01.py

@@ -0,0 +1,11 @@
+from lpython import i32, dataclass
+
+@dataclass
+class A:
+    n: i32
+
+def main0():
+    a: A = A(10)
+    print(-a)
+
+main0()

tests/tests.toml

@@ -845,6 +845,10 @@ asr = true
 filename = "errors/test_pow4.py"
 asr = true
 
+[[test]]
+filename = "errors/test_operator_01.py"
+asr = true
+
 [[test]]
 filename = "errors/test_ord.py"
 asr = true