fix ureal type encoding in abi

Author: Jan Xie

ethereum/abi.py

@@ -194,7 +194,7 @@ def encode_single(typ, arg):
         high, low = [int(x) for x in sub.split('x')]
         if not 0 <= arg < 2**high:
             raise ValueOutOfBounds(repr(arg))
-        return zpad(encode_int(arg * 2**low), 32)
+        return zpad(encode_int(int(arg * 2**low)), 32)
     # Signed reals: real<high>x<low>
     elif base == 'real':
         high, low = [int(x) for x in sub.split('x')]

ethereum/tests/test_abi.py

@@ -28,8 +28,13 @@ def test_abi_encode_single_int():
     with pytest.raises(abi.ValueOutOfBounds):
         assert abi.encode_single(['int', '8', []], 128)
 
+def test_abi_encode_single_ureal():
+    assert abi.encode_single(['ureal', '128x128', []], 0) == (b'\x00'*32)
+    assert abi.encode_single(['ureal', '128x128', []], 1.125) == (b'\x00'*15 + b'\x01\x20' + '\x00'*15)
+    assert abi.encode_single(['ureal', '128x128', []], 2**127-1) == (b'\x7f' + b'\xff'*15 + b'\x00'*16)
+
 def test_abi_encode_single_real():
-    assert abi.encode_single(['real', '128x128', []], 1.125) == (b'\x00'*15 + b'\x01' + b'\x20' + b'\x00'*15)
+    assert abi.encode_single(['real', '128x128', []], 1.125) == (b'\x00'*15 + b'\x01\x20' + b'\x00'*15)
     assert abi.encode_single(['real', '128x128', []], -1.125) == (b'\xff'*15 + b'\xfe' + b'\xe0' + b'\x00'*15)
 
 def test_abi_encode_single_hash():