allow testing genesis with Altair (#2866)

The mocking framework was limited to chain configurations that do not
include Altair at genesis. This patch extends it so that genesis states
can be generated that are already upgraded to Altair. This is useful for
tests such as eth2spec/test/altair/unittests/test_sync_protocol.py.

tests/mocking/mock_genesis.nim

@@ -10,22 +10,33 @@
 
 import
   # Specs
-  ../../beacon_chain/spec/datatypes/phase0,
+  ../../beacon_chain/spec/[beaconstate, forks, state_transition],
-  ../../beacon_chain/spec/[beaconstate],
   # Internals
   ../../beacon_chain/interop,
   # Mocking procs
   ./mock_deposits
 
-proc initGenesisState*(num_validators: uint64): phase0.HashedBeaconState =
+proc initGenesisState*(
+    num_validators: uint64 = 8'u64 * SLOTS_PER_EPOCH,
+    beaconStateFork: BeaconStateFork = forkPhase0): ref ForkedHashedBeaconState =
   let deposits = mockGenesisBalancedDeposits(
       validatorCount = num_validators,
       amountInEth = 32, # We create canonical validators with 32 Eth
       flags = {}
     )
 
-  initialize_hashed_beacon_state_from_eth1(
+  var cfg = defaultRuntimeConfig
-    defaultRuntimeConfig, eth1BlockHash, 0, deposits, {})
+  if beaconStateFork >= forkAltair:
+    cfg.ALTAIR_FORK_EPOCH = GENESIS_EPOCH
+
+  result = (ref ForkedHashedBeaconState)(
+    beaconStateFork: forkPhase0,
+    hbsPhase0: initialize_hashed_beacon_state_from_eth1(
+      cfg, eth1BlockHash, 0, deposits, {}))
+
+  maybeUpgradeStateToAltair(cfg, result[])
+
+  doAssert result.beaconStateFork == beaconStateFork
 
 when isMainModule:
   # Smoke test

tests/spec_block_processing/test_process_attestation.nim

@@ -23,8 +23,7 @@ import
 suite "[Unit - Spec - Block processing] Attestations " & preset():
 
   const NumValidators = uint64(8) * SLOTS_PER_EPOCH
-  let genesisState = (ref ForkedHashedBeaconState)(
+  let genesisState = initGenesisState(NumValidators)
-    hbsPhase0: initGenesisState(NumValidators), beaconStateFork: forkPhase0)
 
   doAssert getStateField(genesisState[], validators).lenu64 == NumValidators
 

tests/spec_block_processing/test_process_deposits.nim

@@ -16,7 +16,7 @@ import
   # Standard library
   std/math,
   # Specs
-  ../../beacon_chain/spec/[state_transition_block],
+  ../../beacon_chain/spec/[forks, state_transition_block],
   ../../beacon_chain/spec/datatypes/base,
   # Internals
   # Mock helpers
@@ -26,7 +26,7 @@ import
 suite "[Unit - Spec - Block processing] Deposits " & preset():
 
   const NumValidators = uint64 5 * SLOTS_PER_EPOCH
-  let genesisState = newClone(initGenesisState(NumValidators))
+  let genesisState = newClone(initGenesisState(NumValidators).hbsPhase0)
   doAssert genesisState.data.validators.lenu64 == NumValidators
 
   template valid_deposit(deposit_amount: uint64, name: string): untyped =

tests/spec_epoch_processing/test_process_justification_and_finalization.nim

@@ -218,8 +218,7 @@ proc payload =
     echo "   Finalization rules are detailed at https://github.com/protolambda/eth2-docs#justification-and-finalization"
 
     const NumValidators = uint64(8) * SLOTS_PER_EPOCH
-    let genesisState = (ref ForkedHashedBeaconState)(
+    let genesisState = initGenesisState(NumValidators)
-      hbsPhase0: initGenesisState(NumValidators), beaconStateFork: forkPhase0)
     doAssert getStateField(genesisState[], validators).lenu64 == NumValidators
 
     setup: