diff --git a/test_libs/pyspec/eth2spec/phase1/state_transition.py b/test_libs/pyspec/eth2spec/phase1/state_transition.py
deleted file mode 100644
index 87b2e1c12..000000000
--- a/test_libs/pyspec/eth2spec/phase1/state_transition.py
+++ /dev/null
@@ -1,70 +0,0 @@
-from . import spec
-
-from .spec import (
-    BeaconState,
-    BeaconBlock,
-    Slot,
-)
-
-from eth2spec.phase0.state_transition import (
-    process_operation_type,
-    process_operations as process_operations_phase0,
-)
-
-
-def process_operations(state: BeaconState, block: BeaconBlock) -> None:
-    process_operations_phase0(state, block)
-
-    process_operation_type(
-        state,
-        block.body.custody_key_reveals,
-        spec.MAX_CUSTODY_KEY_REVEALS,
-        spec.process_custody_key_reveal,
-    )
-
-    process_operation_type(
-        state,
-        block.body.early_derived_secret_reveals,
-        spec.MAX_EARLY_DERIVED_SECRET_REVEALS,
-        spec.process_early_derived_secret_reveal,
-    )
-
-
-def process_block(state: BeaconState,
-                  block: BeaconBlock,
-                  verify_state_root: bool=False) -> None:
-    spec.process_block_header(state, block)
-    spec.process_randao(state, block)
-    spec.process_eth1_data(state, block)
-
-    process_operations(state, block)
-    if verify_state_root:
-        spec.verify_block_state_root(state, block)
-
-
-def process_epoch_transition(state: BeaconState) -> None:
-    spec.process_justification_and_finalization(state)
-    spec.process_crosslinks(state)
-    # TODO: Eligible
-    spec.process_rewards_and_penalties(state)
-    spec.process_registry_updates(state)
-    spec.process_reveal_deadlines(state)
-    spec.process_challenge_deadlines(state)
-    spec.process_slashings(state)
-    spec.process_final_updates(state)
-    spec.after_process_final_updates(state)
-
-
-def state_transition_to(state: BeaconState, up_to: Slot) -> BeaconState:
-    while state.slot < up_to:
-        spec.cache_state(state)
-        if (state.slot + 1) % spec.SLOTS_PER_EPOCH == 0:
-            process_epoch_transition(state)
-        spec.advance_slot(state)
-
-
-def state_transition(state: BeaconState,
-                     block: BeaconBlock,
-                     verify_state_root: bool=False) -> BeaconState:
-    state_transition_to(state, block.slot)
-    process_block(state, block, verify_state_root)