tests: Add new tests for ubinascii differences

.. some of these tests currently fail, but a subsequent commit will
fix them.

tests/extmod/ubinascii_a2b_base64.py

@@ -28,6 +28,9 @@ print(binascii.a2b_base64(b'Zm9v=='))
 print(binascii.a2b_base64(b'Zm9v==='))
 print(binascii.a2b_base64(b'Zm9v===YmFy'))
 
+# Unicode strings can be decoded
+print(binascii.a2b_base64(u'Zm9v===YmFy'))
+
 try:
     print(binascii.a2b_base64(b'abc'))
 except ValueError:

tests/extmod/ubinascii_b2a_base64.py

@@ -20,3 +20,7 @@ print(binascii.b2a_base64(b'\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f'))
 print(binascii.b2a_base64(b'\x7f\x80\xff'))
 print(binascii.b2a_base64(b'1234ABCDabcd'))
 print(binascii.b2a_base64(b'\x00\x00>')) # convert into '+'
+try:
+    print(binascii.b2a_base64(''))
+except TypeError:
+    print("TypeError")

tests/extmod/ubinascii_crc32.py

@@ -22,3 +22,7 @@ print(hex(binascii.crc32(b' over the lazy dog', binascii.crc32(b'The quick brown
 print(hex(binascii.crc32(b'\x00' * 16, binascii.crc32(b'\x00' * 16))))
 print(hex(binascii.crc32(b'\xff' * 16, binascii.crc32(b'\xff' * 16))))
 print(hex(binascii.crc32(bytes(range(16, 32)), binascii.crc32(bytes(range(16))))))
+try:
+    binascii.crc32('')
+except TypeError:
+    print("TypeError")

tests/extmod/ubinascii_hexlify.py

@@ -11,3 +11,7 @@ print(binascii.hexlify(b'\x00\x01\x02\x03\x04\x05\x06\x07'))
 print(binascii.hexlify(b'\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f'))
 print(binascii.hexlify(b'\x7f\x80\xff'))
 print(binascii.hexlify(b'1234ABCDabcd'))
+try:
+    binascii.hexlify('')
+except TypeError:
+    print("TypeError")

tests/extmod/ubinascii_unhexlify.py

@@ -12,6 +12,9 @@ print(binascii.unhexlify(b'08090a0b0c0d0e0f'))
 print(binascii.unhexlify(b'7f80ff'))
 print(binascii.unhexlify(b'313233344142434461626364'))
 
+# Unicode strings can be decoded
+print(binascii.unhexlify('313233344142434461626364'))
+
 try:
     a = binascii.unhexlify(b'0') # odd buffer length
 except ValueError: