TEST: Add test for unsigned integer bitnot

Test taken from #2054

Author: ubaidsk

integration_tests/CMakeLists.txt

@@ -551,6 +551,7 @@ RUN(NAME test_max_min        LABELS cpython llvm c)
 RUN(NAME test_global         LABELS cpython llvm c)
 RUN(NAME test_global_decl    LABELS cpython llvm c)
 RUN(NAME test_integer_bitnot LABELS cpython llvm c wasm)
+RUN(NAME test_unsign_int_bitnot LABELS cpython llvm c)
 RUN(NAME test_ifexp          LABELS cpython llvm c)
 RUN(NAME test_unary_minus    LABELS cpython llvm c)
 RUN(NAME test_unary_plus     LABELS cpython llvm c)

integration_tests/test_unsign_int_bitnot.py

@@ -0,0 +1,22 @@
+from lpython import u16
+
+def foo(grp: u16) -> u16:
+    i: u16 = ~(u16(grp))
+
+    return i
+
+
+def foo2() -> u16:
+    i: u16 = ~(u16(0xffff))
+
+    return i
+
+def foo3() -> u16:
+    i: u16 = ~(u16(0xffff))
+
+    return ~i
+
+assert foo(u16(0)) == u16(0xffff)
+assert foo(u16(0xffff)) == u16(0)
+assert foo2() == u16(0)
+assert foo3() == u16(0xffff)