xfailing test stubs for not yet implemented PoW and BC json tests

Author: heikoheiko

ethereum/tests/test_blockchain.py

@@ -0,0 +1,11 @@
+import os
+import pytest
+import ethereum.testutils as testutils
+
+fixtures = testutils.get_tests_from_file_or_dir(
+    os.path.join(testutils.fixture_path, 'BlockChainTests'))
+
+
+@pytest.mark.xfail
+def test_blockchain():
+    raise Exception('not implemented error')

ethereum/tests/test_ethash.py

@@ -0,0 +1,11 @@
+import os
+import pytest
+import ethereum.testutils as testutils
+
+fixtures = testutils.get_tests_from_file_or_dir(
+    os.path.join(testutils.fixture_path, 'PoWTests'))
+
+
+@pytest.mark.xfail
+def test_pow():
+    raise Exception('not implemented error')