run capella slot sanity tests in CI (#4295)

tests/consensus_spec/capella/all_capella_fixtures.nim

@@ -11,7 +11,7 @@ import
   ./test_fixture_fork,
   ./test_fixture_operations,
   ./test_fixture_sanity_blocks,
-  #./test_fixture_sanity_slots,   # TODO needs forked
+  ./test_fixture_sanity_slots,
   ./test_fixture_ssz_consensus_objects,
   ./test_fixture_state_transition_epoch
   #./test_fixture_transition      # TODO needs forked

tests/consensus_spec/capella/test_fixture_sanity_slots.nim

@@ -0,0 +1,55 @@
+# beacon_chain
+# Copyright (c) 2022 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+{.used.}
+
+import
+  # Standard library
+  os, strutils,
+  # Beacon chain internals
+  ../../../beacon_chain/spec/[forks, state_transition],
+  ../../../beacon_chain/spec/datatypes/capella,
+  # Test utilities
+  ../../testutil,
+  ../fixtures_utils,
+  ../../helpers/debug_state
+
+const SanitySlotsDir = SszTestsDir/const_preset/"capella"/"sanity"/"slots"/"pyspec_tests"
+
+proc runTest(identifier: string) =
+  let
+    testDir = SanitySlotsDir / identifier
+    num_slots = readLines(testDir / "slots.yaml", 2)[0].parseInt.uint64
+
+  proc `testImpl _ slots _ identifier`() =
+    test "Slots - " & identifier:
+      var
+        preState = newClone(parseTest(
+          testDir/"pre.ssz_snappy", SSZ, capella.BeaconState))
+        fhPreState = (ref ForkedHashedBeaconState)(
+          capellaData: capella.HashedBeaconState(
+            data: preState[], root: hash_tree_root(preState[])),
+          kind: BeaconStateFork.Capella)
+        cache = StateCache()
+        info = ForkedEpochInfo()
+      let postState = newClone(parseTest(
+        testDir/"post.ssz_snappy", SSZ, capella.BeaconState))
+
+      check:
+        process_slots(
+          defaultRuntimeConfig, fhPreState[],
+          getStateField(fhPreState[], slot) + num_slots, cache, info, {}).isOk()
+
+        getStateRoot(fhPreState[]) == postState[].hash_tree_root()
+      let newPreState = newClone(fhPreState.capellaData.data)
+      reportDiff(newPreState, postState)
+
+  `testImpl _ slots _ identifier`()
+
+suite "EF - Capella - Sanity - Slots " & preset():
+  for kind, path in walkDir(SanitySlotsDir, relative = true, checkDir = true):
+    runTest(path)