diff --git a/internal/ap/extract_test.go b/internal/ap/ap_test.go
similarity index 91%
rename from internal/ap/extract_test.go
rename to internal/ap/ap_test.go
index deb5ec041..105bc1fcf 100644
--- a/internal/ap/extract_test.go
+++ b/internal/ap/ap_test.go
@@ -184,7 +184,7 @@ func addressable5() ap.Addressable {
 	return note
 }
 
-type ExtractTestSuite struct {
+type APTestSuite struct {
 	suite.Suite
 	document1         vocab.ActivityStreamsDocument
 	attachment1       vocab.ActivityStreamsAttachmentProperty
@@ -196,7 +196,36 @@ type ExtractTestSuite struct {
 	addressable5      ap.Addressable
 }
 
-func (suite *ExtractTestSuite) SetupTest() {
+func (suite *APTestSuite) jsonToType(rawJson string) (vocab.Type, map[string]interface{}) {
+	var raw map[string]interface{}
+	err := json.Unmarshal([]byte(rawJson), &raw)
+	if err != nil {
+		panic(err)
+	}
+
+	t, err := streams.ToType(context.Background(), raw)
+	if err != nil {
+		panic(err)
+	}
+
+	return t, raw
+}
+
+func (suite *APTestSuite) typeToJson(t vocab.Type) string {
+	m, err := ap.Serialize(t)
+	if err != nil {
+		suite.FailNow(err.Error())
+	}
+
+	b, err := json.MarshalIndent(m, "", "  ")
+	if err != nil {
+		suite.FailNow(err.Error())
+	}
+
+	return string(b)
+}
+
+func (suite *APTestSuite) SetupTest() {
 	suite.document1 = document1()
 	suite.attachment1 = attachment1()
 	suite.noteWithMentions1 = noteWithMentions1()
diff --git a/internal/ap/error.go b/internal/ap/error.go
deleted file mode 100644
index ef27d5ac7..000000000
--- a/internal/ap/error.go
+++ /dev/null
@@ -1,35 +0,0 @@
-// GoToSocial
-// Copyright (C) GoToSocial Authors admin@gotosocial.org
-// SPDX-License-Identifier: AGPL-3.0-or-later
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package ap
-
-import "fmt"
-
-// ErrWrongType indicates that we tried to resolve a type into
-// an interface that it's not compatible with, eg a Person into
-// a Statusable.
-type ErrWrongType struct {
-	wrapped error
-}
-
-func (err *ErrWrongType) Error() string {
-	return fmt.Sprintf("wrong received type: %v", err.wrapped)
-}
-
-func newErrWrongType(err error) error {
-	return &ErrWrongType{wrapped: err}
-}
diff --git a/internal/ap/extractattachments_test.go b/internal/ap/extractattachments_test.go
index e3a40c7bb..3d5fc7e89 100644
--- a/internal/ap/extractattachments_test.go
+++ b/internal/ap/extractattachments_test.go
@@ -26,7 +26,7 @@
 )
 
 type ExtractAttachmentsTestSuite struct {
-	ExtractTestSuite
+	APTestSuite
 }
 
 func (suite *ExtractAttachmentsTestSuite) TestExtractAttachmentMissingURL() {
diff --git a/internal/ap/extractcontent_test.go b/internal/ap/extractcontent_test.go
index d4b4808ab..590d1b931 100644
--- a/internal/ap/extractcontent_test.go
+++ b/internal/ap/extractcontent_test.go
@@ -25,7 +25,7 @@
 )
 
 type ExtractContentTestSuite struct {
-	ExtractTestSuite
+	APTestSuite
 }
 
 func (suite *ExtractContentTestSuite) TestExtractContent1() {
diff --git a/internal/ap/extractmentions_test.go b/internal/ap/extractmentions_test.go
index 2f1929c9a..fbfee34f5 100644
--- a/internal/ap/extractmentions_test.go
+++ b/internal/ap/extractmentions_test.go
@@ -25,7 +25,7 @@
 )
 
 type ExtractMentionsTestSuite struct {
-	ExtractTestSuite
+	APTestSuite
 }
 
 func (suite *ExtractMentionsTestSuite) TestExtractMentions() {
diff --git a/internal/ap/extractsensitive_test.go b/internal/ap/extractsensitive_test.go
index f486877f8..ce5571680 100644
--- a/internal/ap/extractsensitive_test.go
+++ b/internal/ap/extractsensitive_test.go
@@ -25,7 +25,7 @@
 )
 
 type ExtractSensitiveTestSuite struct {
-	ExtractTestSuite
+	APTestSuite
 }
 
 func (suite *ExtractMentionsTestSuite) TestExtractSensitive() {
diff --git a/internal/ap/extractvisibility_test.go b/internal/ap/extractvisibility_test.go
index 24fb50ec3..3c894f4a5 100644
--- a/internal/ap/extractvisibility_test.go
+++ b/internal/ap/extractvisibility_test.go
@@ -26,7 +26,7 @@
 )
 
 type ExtractVisibilityTestSuite struct {
-	ExtractTestSuite
+	APTestSuite
 }
 
 func (suite *ExtractVisibilityTestSuite) TestExtractVisibilityPublic() {
diff --git a/internal/ap/normalize_test.go b/internal/ap/normalize_test.go
index 2c9a1907a..cde807f21 100644
--- a/internal/ap/normalize_test.go
+++ b/internal/ap/normalize_test.go
@@ -18,48 +18,16 @@
 package ap_test
 
 import (
-	"context"
-	"encoding/json"
 	"testing"
 
 	"github.com/stretchr/testify/suite"
-	"github.com/superseriousbusiness/activity/streams"
 	"github.com/superseriousbusiness/activity/streams/vocab"
 	"github.com/superseriousbusiness/gotosocial/internal/ap"
 	"github.com/superseriousbusiness/gotosocial/testrig"
 )
 
 type NormalizeTestSuite struct {
-	suite.Suite
-}
-
-func (suite *NormalizeTestSuite) jsonToType(rawJson string) (vocab.Type, map[string]interface{}) {
-	var raw map[string]interface{}
-	err := json.Unmarshal([]byte(rawJson), &raw)
-	if err != nil {
-		panic(err)
-	}
-
-	t, err := streams.ToType(context.Background(), raw)
-	if err != nil {
-		panic(err)
-	}
-
-	return t, raw
-}
-
-func (suite *NormalizeTestSuite) typeToJson(t vocab.Type) string {
-	m, err := ap.Serialize(t)
-	if err != nil {
-		suite.FailNow(err.Error())
-	}
-
-	b, err := json.MarshalIndent(m, "", "  ")
-	if err != nil {
-		suite.FailNow(err.Error())
-	}
-
-	return string(b)
+	APTestSuite
 }
 
 func (suite *NormalizeTestSuite) getStatusable() (vocab.ActivityStreamsNote, map[string]interface{}) {
diff --git a/internal/ap/resolve.go b/internal/ap/resolve.go
index ef4d0b50f..a9955be3f 100644
--- a/internal/ap/resolve.go
+++ b/internal/ap/resolve.go
@@ -20,10 +20,10 @@
 import (
 	"context"
 	"encoding/json"
-	"fmt"
 
 	"github.com/superseriousbusiness/activity/streams"
 	"github.com/superseriousbusiness/activity/streams/vocab"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 )
 
 // ResolveStatusable tries to resolve the given bytes into an ActivityPub Statusable representation.
@@ -33,12 +33,12 @@
 func ResolveStatusable(ctx context.Context, b []byte) (Statusable, error) {
 	rawStatusable := make(map[string]interface{})
 	if err := json.Unmarshal(b, &rawStatusable); err != nil {
-		return nil, fmt.Errorf("ResolveStatusable: error unmarshalling bytes into json: %w", err)
+		return nil, gtserror.Newf("error unmarshalling bytes into json: %w", err)
 	}
 
 	t, err := streams.ToType(ctx, rawStatusable)
 	if err != nil {
-		return nil, fmt.Errorf("ResolveStatusable: error resolving json into ap vocab type: %w", err)
+		return nil, gtserror.Newf("error resolving json into ap vocab type: %w", err)
 	}
 
 	var (
@@ -68,8 +68,8 @@ func ResolveStatusable(ctx context.Context, b []byte) (Statusable, error) {
 	}
 
 	if !ok {
-		err = fmt.Errorf("ResolveStatusable: could not resolve %T to Statusable", t)
-		return nil, newErrWrongType(err)
+		err = gtserror.Newf("could not resolve %T to Statusable", t)
+		return nil, gtserror.SetWrongType(err)
 	}
 
 	NormalizeIncomingContent(statusable, rawStatusable)
@@ -87,12 +87,12 @@ func ResolveStatusable(ctx context.Context, b []byte) (Statusable, error) {
 func ResolveAccountable(ctx context.Context, b []byte) (Accountable, error) {
 	rawAccountable := make(map[string]interface{})
 	if err := json.Unmarshal(b, &rawAccountable); err != nil {
-		return nil, fmt.Errorf("ResolveAccountable: error unmarshalling bytes into json: %w", err)
+		return nil, gtserror.Newf("error unmarshalling bytes into json: %w", err)
 	}
 
 	t, err := streams.ToType(ctx, rawAccountable)
 	if err != nil {
-		return nil, fmt.Errorf("ResolveAccountable: error resolving json into ap vocab type: %w", err)
+		return nil, gtserror.Newf("error resolving json into ap vocab type: %w", err)
 	}
 
 	var (
@@ -114,8 +114,8 @@ func ResolveAccountable(ctx context.Context, b []byte) (Accountable, error) {
 	}
 
 	if !ok {
-		err = fmt.Errorf("ResolveAccountable: could not resolve %T to Accountable", t)
-		return nil, newErrWrongType(err)
+		err = gtserror.Newf("could not resolve %T to Accountable", t)
+		return nil, gtserror.SetWrongType(err)
 	}
 
 	NormalizeIncomingSummary(accountable, rawAccountable)
diff --git a/internal/ap/resolve_test.go b/internal/ap/resolve_test.go
new file mode 100644
index 000000000..efb56b1c4
--- /dev/null
+++ b/internal/ap/resolve_test.go
@@ -0,0 +1,52 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package ap_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/superseriousbusiness/gotosocial/internal/ap"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+type ResolveTestSuite struct {
+	APTestSuite
+}
+
+func (suite *ResolveTestSuite) TestResolveDocumentAsStatusable() {
+	b := []byte(suite.typeToJson(suite.document1))
+
+	statusable, err := ap.ResolveStatusable(context.Background(), b)
+	suite.NoError(err)
+	suite.NotNil(statusable)
+}
+
+func (suite *ResolveTestSuite) TestResolveDocumentAsAccountable() {
+	b := []byte(suite.typeToJson(suite.document1))
+
+	accountable, err := ap.ResolveAccountable(context.Background(), b)
+	suite.True(gtserror.WrongType(err))
+	suite.EqualError(err, "ResolveAccountable: could not resolve *typedocument.ActivityStreamsDocument to Accountable")
+	suite.Nil(accountable)
+}
+
+func TestResolveTestSuite(t *testing.T) {
+	suite.Run(t, &ResolveTestSuite{})
+}
diff --git a/internal/gtserror/error.go b/internal/gtserror/error.go
index 6eaa3db63..85dc0d54c 100644
--- a/internal/gtserror/error.go
+++ b/internal/gtserror/error.go
@@ -40,26 +40,35 @@
 	TypeSMTP ErrorType = "smtp" // smtp (mail)
 )
 
-// Unretrievable ...
+// Unretrievable checks error for a stored "unretrievable" flag.
+//
+// Unretrievable indicates that a call to retrieve a resource
+// (account, status, etc) could not be fulfilled, either because
+// it was not found locally, or because some prerequisite remote
+// resource call failed, making it impossible to return the item.
 func Unretrievable(err error) bool {
 	_, ok := errors.Value(err, unrtrvableKey).(struct{})
 	return ok
 }
 
-// SetUnretrievable ...
+// SetUnretrievable will wrap the given error to store an "unretrievable"
+// flag, returning wrapped error. See "Unretrievable" for example use-cases.
 func SetUnretrievable(err error) error {
 	return errors.WithValue(err, unrtrvableKey, struct{}{})
 }
 
-// WrongType ...
+// WrongType checks error for a stored "wrong type" flag. Wrong type
+// indicates that an ActivityPub URI returned a type we weren't expecting:
+// Statusable instead of Accountable, or vice versa, for example.
 func WrongType(err error) bool {
 	_, ok := errors.Value(err, wrongTypeKey).(struct{})
 	return ok
 }
 
-// SetWrongType ...
+// SetWrongType will wrap the given error to store a "wrong type" flag,
+// returning wrapped error. See "WrongType" for example use-cases.
 func SetWrongType(err error) error {
-	return errors.WithValue(err, unrtrvableKey, struct{}{})
+	return errors.WithValue(err, wrongTypeKey, struct{}{})
 }
 
 // StatusCode checks error for a stored status code value. For example