tests/extmod: Add some uctypes tests to improve coverage of that module.

tests/extmod/uctypes_bytearray.py

@@ -17,3 +17,6 @@ S = uctypes.struct(uctypes.addressof(data), desc, uctypes.LITTLE_ENDIAN)
 print(S.arr)
 # But not INT8, because value range is different
 print(type(S.arr2))
+
+# convert to buffer
+print(bytearray(S))

tests/extmod/uctypes_bytearray.py.exp

@@ -1,2 +1,3 @@
 bytearray(b'01')
 <class 'struct'>
+bytearray(b'0123')

tests/extmod/uctypes_byteat.py

@@ -0,0 +1,10 @@
+try:
+    import uctypes
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+data = bytearray(b'01234567')
+
+print(uctypes.bytes_at(uctypes.addressof(data), 4)) 
+print(uctypes.bytearray_at(uctypes.addressof(data), 4)) 

tests/extmod/uctypes_byteat.py.exp

@@ -0,0 +1,2 @@
+b'0123'
+bytearray(b'0123')

tests/extmod/uctypes_error.py

@@ -0,0 +1,37 @@
+# test general errors with uctypes
+
+try:
+    import uctypes
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+data = bytearray(b"01234567")
+
+# del subscr not supported
+S = uctypes.struct(uctypes.addressof(data), {}) 
+try:
+    del S[0]
+except TypeError:
+    print('TypeError')
+
+# list is an invalid descriptor
+S = uctypes.struct(uctypes.addressof(data), []) 
+try:
+    S.x 
+except TypeError:
+    print('TypeError')
+
+# can't access attribute with invalid descriptor
+S = uctypes.struct(uctypes.addressof(data), {'x':[]})
+try:
+    S.x 
+except TypeError:
+    print('TypeError')
+
+# can't assign to aggregate
+S = uctypes.struct(uctypes.addressof(data), {'x':(uctypes.ARRAY | 0, uctypes.INT8 | 2)})
+try:
+    S.x = 1 
+except TypeError:
+    print('TypeError')

tests/extmod/uctypes_error.py.exp

@@ -0,0 +1,4 @@
+TypeError
+TypeError
+TypeError
+TypeError

tests/extmod/uctypes_sizeof.py

@@ -40,3 +40,8 @@ assert uctypes.sizeof(S.arr4) == 6
 print(uctypes.sizeof(S.sub))
 assert uctypes.sizeof(S.sub) == 1
 
+# invalid descriptor
+try:
+    print(uctypes.sizeof([]))
+except TypeError:
+    print("TypeError")

tests/extmod/uctypes_sizeof.py.exp

@@ -4,3 +4,4 @@
 TypeError
 6
 1
+TypeError

tests/extmod/uctypes_sizeof_float.py

@@ -0,0 +1,8 @@
+try:
+    import uctypes
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+print(uctypes.sizeof({'f':uctypes.FLOAT32}))
+print(uctypes.sizeof({'f':uctypes.FLOAT64}))

tests/extmod/uctypes_sizeof_float.py.exp

@@ -0,0 +1,2 @@
+4
+8