refactor: fix import cycle for mock resolver

pkg/attest/verify_test.go

@@ -34,7 +34,7 @@ func TestVerifyAttestations(t *testing.T) {
 	env := new(attestation.Envelope)
 	err = json.Unmarshal(ex, env)
 	assert.NoError(t, err)
-	resolver := &test.MockResolver{
+	resolver := &oci.MockResolver{
 		Envs: []*attestation.Envelope{env},
 	}
 

pkg/mirror/mirror_test.go

@@ -96,9 +96,9 @@ func TestSavingReferrers(t *testing.T) {
 	err = SaveReferrers(manifest, output)
 	require.NoError(t, err)
 
-	reg := &test.MockRegistryResolver{
+	reg := &oci.MockRegistryResolver{
 		Subject:      subject,
-		MockResolver: &test.MockResolver{},
+		MockResolver: &oci.MockResolver{},
 		ImageNameStr: indexName,
 	}
 	require.NoError(t, err)

pkg/oci/mock.go

@@ -0,0 +1,50 @@
+package oci
+
+import (
+	"context"
+
+	"github.com/docker/attest/pkg/attestation"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+)
+
+type MockResolver struct {
+	Envs []*attestation.Envelope
+}
+
+func (r MockResolver) Attestations(_ context.Context, _ string) ([]*attestation.Envelope, error) {
+	return r.Envs, nil
+}
+
+func (r MockResolver) ImageName(_ context.Context) (string, error) {
+	return "library/alpine:latest", nil
+}
+
+func (r MockResolver) ImageDescriptor(_ context.Context) (*v1.Descriptor, error) {
+	digest, err := v1.NewHash("sha256:da8b190665956ea07890a0273e2a9c96bfe291662f08e2860e868eef69c34620")
+	if err != nil {
+		return nil, err
+	}
+	return &v1.Descriptor{
+		Digest:    digest,
+		Size:      1234,
+		MediaType: "application/vnd.oci.image.manifest.v1+json",
+	}, nil
+}
+
+func (r MockResolver) ImagePlatform(_ context.Context) (*v1.Platform, error) {
+	return ParsePlatform("linux/amd64")
+}
+
+type MockRegistryResolver struct {
+	Subject      *v1.Descriptor
+	ImageNameStr string
+	*MockResolver
+}
+
+func (r *MockRegistryResolver) ImageDescriptor(_ context.Context) (*v1.Descriptor, error) {
+	return r.Subject, nil
+}
+
+func (r *MockRegistryResolver) ImageName(_ context.Context) (string, error) {
+	return r.ImageNameStr, nil
+}

pkg/policy/policy_test.go

@@ -38,7 +38,7 @@ func TestRegoEvaluator_Evaluate(t *testing.T) {
 
 	re := policy.NewRegoEvaluator(true)
 
-	defaultResolver := test.MockResolver{
+	defaultResolver := oci.MockResolver{
 		Envs: []*attestation.Envelope{loadAttestation(t, ExampleAttestation)},
 	}