diff --git a/tests/blockchain/eth/entities/actors/test_deployer.py b/tests/blockchain/eth/entities/actors/test_deployer.py
index e668aaf4e..2e147e37b 100644
--- a/tests/blockchain/eth/entities/actors/test_deployer.py
+++ b/tests/blockchain/eth/entities/actors/test_deployer.py
@@ -25,7 +25,8 @@ from nucypher.blockchain.eth.actors import Deployer
 from nucypher.blockchain.eth.interfaces import BlockchainDeployerInterface
 from nucypher.blockchain.eth.registry import InMemoryEthereumContractRegistry, InMemoryAllocationRegistry
 from nucypher.blockchain.eth.sol.compile import SolidityCompiler
-from nucypher.utilities.sandbox.blockchain import TesterBlockchain
+# Prevents TesterBlockchain to be picked up by py.test as a test class
+from nucypher.utilities.sandbox.blockchain import TesterBlockchain as _TesterBlockchain
 from nucypher.utilities.sandbox.constants import (
     ONE_YEAR_IN_SECONDS,
     USER_ESCROW_PROXY_DEPLOYMENT_SECRET,
@@ -45,7 +46,7 @@ def test_rapid_deployment(token_economics):
                                             registry=registry,
                                             provider_uri=TEST_PROVIDER_URI)
 
-    blockchain = TesterBlockchain(interface=interface, eth_airdrop=False, test_accounts=4)
+    blockchain = _TesterBlockchain(interface=interface, eth_airdrop=False, test_accounts=4)
     deployer_address = blockchain.etherbase_account
 
     deployer = Deployer(blockchain=blockchain, deployer_address=deployer_address)
diff --git a/tests/blockchain/eth/interfaces/test_chains.py b/tests/blockchain/eth/interfaces/test_chains.py
index 05e1f1299..555d41184 100644
--- a/tests/blockchain/eth/interfaces/test_chains.py
+++ b/tests/blockchain/eth/interfaces/test_chains.py
@@ -22,7 +22,8 @@ from nucypher.utilities.sandbox.constants import NUMBER_OF_ETH_TEST_ACCOUNTS, NU
 
 from nucypher.blockchain.eth.interfaces import BlockchainDeployerInterface
 from nucypher.blockchain.eth.registry import InMemoryEthereumContractRegistry
-from nucypher.utilities.sandbox.blockchain import TesterBlockchain
+# Prevents TesterBlockchain to be picked up by py.test as a test class
+from nucypher.utilities.sandbox.blockchain import TesterBlockchain as _TesterBlockchain
 
 
 @pytest.fixture()
@@ -31,7 +32,7 @@ def another_testerchain(solidity_compiler):
     deployer_interface = BlockchainDeployerInterface(compiler=solidity_compiler,
                                                      registry=memory_registry,
                                                      provider_uri=TEST_PROVIDER_URI)
-    testerchain = TesterBlockchain(interface=deployer_interface,
+    testerchain = _TesterBlockchain(interface=deployer_interface,
                                    test_accounts=2*NUMBER_OF_ETH_TEST_ACCOUNTS,
                                    eth_airdrop=True)
     deployer_interface.deployer_address = testerchain.etherbase_account
diff --git a/tests/cli/test_deploy.py b/tests/cli/test_deploy.py
index b60089cf2..dafcaec68 100644
--- a/tests/cli/test_deploy.py
+++ b/tests/cli/test_deploy.py
@@ -19,7 +19,8 @@ from nucypher.blockchain.eth.registry import AllocationRegistry, EthereumContrac
 from nucypher.blockchain.eth.sol.compile import SolidityCompiler
 from nucypher.cli.deploy import deploy
 from nucypher.config.constants import DEFAULT_CONFIG_ROOT
-from nucypher.utilities.sandbox.blockchain import TesterBlockchain
+# Prevents TesterBlockchain to be picked up by py.test as a test class
+from nucypher.utilities.sandbox.blockchain import TesterBlockchain as _TesterBlockchain
 from nucypher.utilities.sandbox.constants import (
     TEST_PROVIDER_URI,
     MOCK_REGISTRY_FILEPATH,
@@ -42,7 +43,7 @@ def make_testerchain(provider_uri, solidity_compiler):
 
     # Destroy existing blockchain
     BlockchainInterface.disconnect()
-    TesterBlockchain.sever_connection()
+    _TesterBlockchain.sever_connection()
 
     registry = EthereumContractRegistry(registry_filepath=MOCK_REGISTRY_FILEPATH)
     deployer_interface = BlockchainDeployerInterface(compiler=solidity_compiler,
@@ -50,7 +51,7 @@ def make_testerchain(provider_uri, solidity_compiler):
                                                      provider_uri=provider_uri)
 
     # Create new blockchain
-    testerchain = TesterBlockchain(interface=deployer_interface,
+    testerchain = _TesterBlockchain(interface=deployer_interface,
                                    eth_airdrop=True,
                                    free_transactions=False,
                                    poa=True)
@@ -320,7 +321,7 @@ def test_nucypher_deploy_allocation_contracts(click_runner,
                                               mock_allocation_infile,
                                               token_economics):
 
-    TesterBlockchain.sever_connection()
+    _TesterBlockchain.sever_connection()
     Agency.clear()
 
     if os.path.isfile(MOCK_ALLOCATION_REGISTRY_FILEPATH):