tests: Add tests for non-compliant behaviour.

These tests are intended to improve coverage and provide a record of
behaviour that's either not implemented or non-compliant to CPython.

tests/misc/non_compliant.py

+# tests for things that are not implemented, or have non-compliant behaviour
+
+import array
+
+# array deletion not implemented
+try:
+    a = array.array('b', (1, 2, 3))
+    del a[1]
+except TypeError:
+    print('TypeError')
+
+# slice with step!=1 not implemented
+try:
+    a = array.array('b', (1, 2, 3))
+    print(a[3:2:2])
+except NotImplementedError:
+    print('NotImplementedError')
+
+# should raise type error
+try:
+    print(set('12') >= '1')
+except TypeError:
+    print('TypeError')
+
+# should raise type error
+try:
+    print(set('12') <= '123')
+except TypeError:
+    print('TypeError')
+
+# uPy raises TypeError, shold be ValueError
+try:
+    '%c' % b'\x01\x02'
+except (TypeError, ValueError):
+    print('TypeError, ValueError')
+
+# attributes/subscr not implemented
+try:
+    print('{a[0]}'.format(a=[1, 2]))
+except NotImplementedError:
+    print('NotImplementedError')

tests/misc/non_compliant.py.exp

+TypeError
+NotImplementedError
+True
+True
+TypeError
+NotImplementedError