TEST: Add test for global unsigned int variable

Author: ubaidsk

integration_tests/CMakeLists.txt

@@ -428,6 +428,7 @@ RUN(NAME expr_20             LABELS cpython llvm c)
 RUN(NAME expr_01u            LABELS cpython llvm c NOFAST)
 RUN(NAME expr_02u            LABELS cpython llvm c NOFAST)
 RUN(NAME expr_03u            LABELS cpython llvm c NOFAST)
+RUN(NAME expr_04u            LABELS cpython llvm c)
 
 RUN(NAME loop_01             LABELS cpython llvm c)
 RUN(NAME loop_02             LABELS cpython llvm c wasm wasm_x86 wasm_x64)

integration_tests/expr_04u.py

@@ -0,0 +1,12 @@
+from lpython import u8, u16, u32, u64
+
+FLAG1 : u8 = u8(1) << u8(4)
+FLAG2 : u16 = u16(1) << u16(4)
+FLAG3: u32 = u32(1) << u32(4)
+FLAG4: u64 = u64(1) << u64(4)
+
+print(FLAG1, FLAG2, FLAG3, FLAG4)
+assert FLAG1 == u8(16)
+assert FLAG2 == u16(16)
+assert FLAG3 == u32(16)
+assert FLAG4 == u64(16)