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tests [![Build Status](https://travis-ci.org/ethereum/tests.svg?branch=develop)](https://travis-ci.org/ethereum/tests)
=====
-Common tests for all clients to test against. See the documentation http://ethereum-tests.readthedocs.io/
+Common tests for all clients to test against.
+
+Test Formats
+------------
+
+See descriptions of the different test formats in the official documentation at http://ethereum-tests.readthedocs.io/.
+
+*Note*:
+The format of BlockchainTests recently changed with the introduction of a new field ``sealEngine`` (values: ``NoProof`` | ``Ethash``), see related JSON Schema [change](https://github.com/ethereum/tests/commit/3be71ec3364a01fd4f2cb9b9fd086f3f69f0225c) or BlockchainTest format [docs](https://ethereum-tests.readthedocs.io/en/latest/test_types/blockchain_tests.html) for reference.
+
+This means that you can skip PoW validation for ``NoProof`` tests but also has the consequence that it is not possible to rely on/check ``PoW`` related block parameters for these tests any more.
Contents of this repository
---------------------------