diff --git a/beacon-chain/core/epoch/spectest/BUILD.bazel b/beacon-chain/core/epoch/spectest/BUILD.bazel
index f8ab791d6..70ee62b87 100644
--- a/beacon-chain/core/epoch/spectest/BUILD.bazel
+++ b/beacon-chain/core/epoch/spectest/BUILD.bazel
@@ -26,6 +26,7 @@ go_test(
     ],
     deps = [
         "//beacon-chain/core/epoch:go_default_library",
+        "//beacon-chain/core/epoch/precompute:go_default_library",
         "//beacon-chain/core/helpers:go_default_library",
         "//proto/beacon/p2p/v1:go_default_library",
         "//shared/params/spectest:go_default_library",
@@ -55,6 +56,7 @@ go_test(
     ],
     deps = [
         "//beacon-chain/core/epoch:go_default_library",
+        "//beacon-chain/core/epoch/precompute:go_default_library",
         "//beacon-chain/core/helpers:go_default_library",
         "//proto/beacon/p2p/v1:go_default_library",
         "//shared/params/spectest:go_default_library",
diff --git a/beacon-chain/core/epoch/spectest/justification_and_finalization_test.go b/beacon-chain/core/epoch/spectest/justification_and_finalization_test.go
index edb33f82c..2df30f929 100644
--- a/beacon-chain/core/epoch/spectest/justification_and_finalization_test.go
+++ b/beacon-chain/core/epoch/spectest/justification_and_finalization_test.go
@@ -1,10 +1,12 @@
 package spectest
 
 import (
+	"context"
 	"path"
 	"testing"
 
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
 	"github.com/prysmaticlabs/prysm/shared/params/spectest"
@@ -22,6 +24,7 @@ func runJustificationAndFinalizationTests(t *testing.T, config string) {
 		t.Run(folder.Name(), func(t *testing.T) {
 			folderPath := path.Join(testsFolderPath, folder.Name())
 			testutil.RunEpochOperationTest(t, folderPath, processJustificationAndFinalizationWrapper)
+			testutil.RunEpochOperationTest(t, folderPath, processJustificationAndFinalizationPrecomputeWrapper)
 		})
 	}
 }
@@ -53,3 +56,19 @@ func processJustificationAndFinalizationWrapper(t *testing.T, state *pb.BeaconSt
 
 	return state, nil
 }
+
+func processJustificationAndFinalizationPrecomputeWrapper(t *testing.T, state *pb.BeaconState) (*pb.BeaconState, error) {
+	ctx := context.Background()
+	vp, bp := precompute.New(ctx, state)
+	_, bp, err := precompute.ProcessAttestations(ctx, state, vp, bp)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	state, err = precompute.ProcessJustificationAndFinalizationPreCompute(state, bp)
+	if err != nil {
+		t.Fatalf("could not process justification: %v", err)
+	}
+
+	return state, nil
+}
diff --git a/beacon-chain/core/epoch/spectest/slashings_test.go b/beacon-chain/core/epoch/spectest/slashings_test.go
index c9421cc2f..2916a3a04 100644
--- a/beacon-chain/core/epoch/spectest/slashings_test.go
+++ b/beacon-chain/core/epoch/spectest/slashings_test.go
@@ -1,10 +1,12 @@
 package spectest
 
 import (
+	"context"
 	"path"
 	"testing"
 
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute"
 	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
 	"github.com/prysmaticlabs/prysm/shared/params/spectest"
 	"github.com/prysmaticlabs/prysm/shared/testutil"
@@ -20,6 +22,7 @@ func runSlashingsTests(t *testing.T, config string) {
 		t.Run(folder.Name(), func(t *testing.T) {
 			folderPath := path.Join(testsFolderPath, folder.Name())
 			testutil.RunEpochOperationTest(t, folderPath, processSlashingsWrapper)
+			testutil.RunEpochOperationTest(t, folderPath, processSlashingsPrecomputeWrapper)
 		})
 	}
 }
@@ -31,3 +34,15 @@ func processSlashingsWrapper(t *testing.T, state *pb.BeaconState) (*pb.BeaconSta
 	}
 	return state, nil
 }
+
+func processSlashingsPrecomputeWrapper(t *testing.T, state *pb.BeaconState) (*pb.BeaconState, error) {
+	ctx := context.Background()
+	vp, bp := precompute.New(ctx, state)
+	_, bp, err := precompute.ProcessAttestations(ctx, state, vp, bp)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	state = precompute.ProcessSlashingsPrecompute(state, bp)
+	return state, nil
+}