diff --git a/tests/integration/generate_fixtures/common.py b/tests/integration/generate_fixtures/common.py
index 7f3cdfa947..871cf8719b 100644
--- a/tests/integration/generate_fixtures/common.py
+++ b/tests/integration/generate_fixtures/common.py
@@ -219,7 +219,7 @@ def mine_block(web3):
 def mine_transaction_hash(web3, txn_hash):
     start_time = time.time()
     web3.geth.miner.start(1)
-    while time.time() < start_time + 240:
+    while time.time() < start_time + 120:
         try:
             receipt = web3.eth.getTransactionReceipt(txn_hash)
         except TransactionNotFound:
diff --git a/tests/integration/generate_fixtures/parity.py b/tests/integration/generate_fixtures/parity.py
index c9d44e4758..eec2cd34af 100644
--- a/tests/integration/generate_fixtures/parity.py
+++ b/tests/integration/generate_fixtures/parity.py
@@ -29,11 +29,8 @@
                 "minimumDifficulty": "0x020000",
                 "difficultyBoundDivisor": "0x0800",
                 "durationLimit": "0x0d",
-                #  "blockReward": "0x4563918244F40000",  # homestead
-                #  "blockReward": "0x29a2241af62c0000",  # byzantium
                 "blockReward": "0x1bc16d674ec80000",  # constantinople
                 "difficultyBombDelays": {
-                    #  "0x0": "0x2dc6c0",  # byzantium
                     "0x0": "0x1e8480",
                 },
                 "homesteadTransition": 0,
diff --git a/tests/integration/test_ethereum_tester.py b/tests/integration/test_ethereum_tester.py
index 07a6e3d78b..6497e66f51 100644
--- a/tests/integration/test_ethereum_tester.py
+++ b/tests/integration/test_ethereum_tester.py
@@ -153,11 +153,6 @@ def revert_contract(web3, revert_contract_factory, revert_contract_deploy_txn_ha
     return revert_contract_factory(contract_address)
 
 
-@pytest.fixture(scope="module")
-def revert_contract_address(revert_contract, address_conversion_func):
-    return address_conversion_func(revert_contract.address)
-
-
 UNLOCKABLE_PRIVATE_KEY = '0x392f63a79b1ff8774845f3fa69de4a13800a59e7083f5187f1558f0797ad0f01'
 
 
@@ -332,12 +327,6 @@ def test_eth_chainId(self, web3):
     def test_eth_getTransactionReceipt_mined(self, web3, block_with_txn, mined_txn_hash):
         super().test_eth_getTransactionReceipt_mined(web3, block_with_txn, mined_txn_hash)
 
-    def test_eth_call_revert_with_msg(self, web3, revert_contract, unlocked_account) -> None:
-        super().test_eth_call_revert_with_msg(web3, revert_contract, unlocked_account)
-
-    def test_eth_estimateGas_revert_with_msg(self, web3, revert_contract, unlocked_account) -> None:
-        super().test_eth_estimateGas_revert_with_msg(web3, revert_contract, unlocked_account)
-
 
 class TestEthereumTesterVersionModule(VersionModuleTest):
     pass
diff --git a/tests/integration/tester.zip b/tests/integration/tester.zip
deleted file mode 100644
index e5f2b58457..0000000000
Binary files a/tests/integration/tester.zip and /dev/null differ
diff --git a/web3/_utils/method_formatters.py b/web3/_utils/method_formatters.py
index b195f5ea7f..eb1df9eb8d 100644
--- a/web3/_utils/method_formatters.py
+++ b/web3/_utils/method_formatters.py
@@ -502,13 +502,11 @@ def get_revert_reason(response: RPCResponse) -> str:
 
     See also https://solidity.readthedocs.io/en/v0.6.3/control-structures.html#revert
     """
-    assert 'error' in response
     if not isinstance(response['error'], dict):
         return None
 
-    data = response['error'].get('data', '')
-
     # Parity/OpenEthereum case:
+    data = response['error'].get('data', '')
     if data.startswith('Reverted '):
         # "Reverted", function selector and offset are always the same for revert errors
         prefix = 'Reverted 0x08c379a00000000000000000000000000000000000000000000000000000000000000020'  # noqa: 501