test new state machine class and new chain class are well defined

tests/eth2/beacon/chains/test_chains.py

@@ -0,0 +1,13 @@
+import pytest
+from eth2.beacon.chains.testnet import TestnetChain
+
+
+@pytest.mark.parametrize(
+    "chain_klass",
+    (
+        TestnetChain,
+    )
+)
+def test_chain_class_well_defined(chain_klass):
+    chain = chain_klass(None)
+    assert chain.sm_configuration is not ()

tests/eth2/beacon/state_machines/forks/test_fork_classes.py

@@ -0,0 +1,13 @@
+import pytest
+from eth2.beacon.state_machines.forks.xiao_long_bao import XiaoLongBaoStateMachine
+
+
+@pytest.mark.parametrize(
+    "sm_klass",
+    (
+        XiaoLongBaoStateMachine,
+    )
+)
+def test_sm_class_well_defined(sm_klass):
+    state_machine = sm_klass(chaindb=None, block=None)
+    assert state_machine.get_block_class()