test for encoding hash in abi

Author: Jan Xie

ethereum/tests/test_abi.py

@@ -26,6 +26,10 @@ def test_abi_encode_single_int():
     with pytest.raises(abi.ValueOutOfBounds):
         assert abi.encode_single(['int', '8', []], 128)
 
+def test_abi_encode_single_hash():
+    assert abi.encode_single(['hash', '8', []], b'\x00'*8) == b'\x00'*32
+    assert abi.encode_single(['hash', '8', []], '00'*8) == b'\x00'*32
+
 # SETUP TESTS IN GLOBAL NAME SPACE
 def gen_func(filename, testname, testdata):
     return lambda: do_test_state(filename, testname, testdata)