moductypes: Add test for accessing UINT8 array.

tests/extmod/uctypes_bytearray.py

@@ -0,0 +1,15 @@
+import uctypes
+
+desc = {
+    "arr": (uctypes.ARRAY | 0, uctypes.UINT8 | 2),
+    "arr2": (uctypes.ARRAY | 2, uctypes.INT8 | 2),
+}
+
+data = bytearray(b"01234567")
+
+S = uctypes.struct(desc, uctypes.addressof(data), uctypes.LITTLE_ENDIAN)
+
+# Arrays of UINT8 are accessed as bytearrays
+print(S.arr)
+# But not INT8, because value range is different
+print(type(S.arr2))

tests/extmod/uctypes_bytearray.py.exp

@@ -0,0 +1,2 @@
+bytearray(b'01')
+<class 'struct'>