Add a test for overloading

Author: Smit-create

integration_tests/test_generics_01.py

@@ -0,0 +1,30 @@
+from ltypes import overload
+
+@overload
+def foo(a: int, b: int) -> int:
+    return a*b
+
+@overload
+def foo(a: int) -> int:
+    return a**2
+
+@overload
+def foo(a: str) -> str:
+    return "lpython-" + a
+
+@overload
+def test(a: int) -> int:
+    return a + 10
+
+@overload
+def test(a: bool) -> int:
+    if a:
+        return 10
+    return -10
+
+
+assert foo(2) == 4
+assert foo(2, 10) == 20
+assert foo("hello") == "lpython-hello"
+assert test(10) == 20
+assert test(False) == -test(True) and test(True) == 10