diff --git a/src/pkg/extensions/extensions_test.go b/src/pkg/extensions/extensions_test.go
index 8b1412a28..9c0b6c97d 100644
--- a/src/pkg/extensions/extensions_test.go
+++ b/src/pkg/extensions/extensions_test.go
@@ -5,7 +5,6 @@ package extensions
 import (
 	"bytes"
 	"context"
-	"hash/crc32"
 	"io"
 	"testing"
 
@@ -15,78 +14,8 @@ import (
 
 	"github.com/alcionai/corso/src/internal/tester"
 	"github.com/alcionai/corso/src/pkg/backup/details"
-	"github.com/alcionai/corso/src/pkg/logger"
 )
 
-var _ CorsoItemExtension = &MockExtension{}
-
-type MockExtension struct {
-	numBytes    int
-	crc32       uint32
-	info        details.ItemInfo
-	extInfo     *details.ExtensionInfo
-	innerRc     io.ReadCloser
-	ctx         context.Context
-	failOnRead  bool
-	failOnClose bool
-}
-
-func (me *MockExtension) Read(p []byte) (int, error) {
-	if me.failOnRead {
-		return 0, clues.New("mock read error")
-	}
-
-	n, err := me.innerRc.Read(p)
-	if err != nil && err != io.EOF {
-		logger.CtxErr(me.ctx, err).Error("inner read error")
-		return n, err
-	}
-
-	me.numBytes += n
-	me.crc32 = crc32.Update(me.crc32, crc32.IEEETable, p[:n])
-
-	if err == io.EOF {
-		logger.Ctx(me.ctx).Debug("mock extension reached EOF")
-		me.extInfo.Data["numBytes"] = me.numBytes
-		me.extInfo.Data["crc32"] = me.crc32
-	}
-
-	return n, err
-}
-
-func (me *MockExtension) Close() error {
-	if me.failOnClose {
-		return clues.New("mock close error")
-	}
-
-	err := me.innerRc.Close()
-	if err != nil {
-		return err
-	}
-
-	me.extInfo.Data["numBytes"] = me.numBytes
-	me.extInfo.Data["crc32"] = me.crc32
-	logger.Ctx(me.ctx).Infow(
-		"mock extension closed",
-		"numBytes", me.numBytes, "crc32", me.crc32)
-
-	return nil
-}
-
-func NewMockExtension(
-	ctx context.Context,
-	rc io.ReadCloser,
-	info details.ItemInfo,
-	extInfo *details.ExtensionInfo,
-) (CorsoItemExtension, error) {
-	return &MockExtension{
-		ctx:     ctx,
-		innerRc: rc,
-		info:    info,
-		extInfo: extInfo,
-	}, nil
-}
-
 type ExtensionsUnitSuite struct {
 	tester.Suite
 }
@@ -120,14 +49,7 @@ func (suite *ExtensionsUnitSuite) TestAddItemExtensions() {
 		{
 			name: "happy path",
 			factories: []CorsoItemExtensionFactory{
-				func(
-					ctx context.Context,
-					rc io.ReadCloser,
-					info details.ItemInfo,
-					extInfo *details.ExtensionInfo,
-				) (CorsoItemExtension, error) {
-					return NewMockExtension(ctx, rc, info, extInfo)
-				},
+				NewMockExtension,
 			},
 			rc: testRc,
 			validateOutputs: func(
diff --git a/src/pkg/extensions/mock_extensions.go b/src/pkg/extensions/mock_extensions.go
new file mode 100644
index 000000000..d3d7a1834
--- /dev/null
+++ b/src/pkg/extensions/mock_extensions.go
@@ -0,0 +1,81 @@
+package extensions
+
+import (
+	"context"
+	"hash/crc32"
+	"io"
+
+	"github.com/alcionai/clues"
+
+	"github.com/alcionai/corso/src/pkg/backup/details"
+	"github.com/alcionai/corso/src/pkg/logger"
+)
+
+var _ CorsoItemExtension = &MockExtension{}
+
+type MockExtension struct {
+	numBytes    int
+	crc32       uint32
+	info        details.ItemInfo
+	extInfo     *details.ExtensionInfo
+	innerRc     io.ReadCloser
+	ctx         context.Context
+	failOnRead  bool
+	failOnClose bool
+}
+
+func (me *MockExtension) Read(p []byte) (int, error) {
+	if me.failOnRead {
+		return 0, clues.New("mock read error")
+	}
+
+	n, err := me.innerRc.Read(p)
+	if err != nil && err != io.EOF {
+		logger.CtxErr(me.ctx, err).Error("inner read error")
+		return n, err
+	}
+
+	me.numBytes += n
+	me.crc32 = crc32.Update(me.crc32, crc32.IEEETable, p[:n])
+
+	if err == io.EOF {
+		logger.Ctx(me.ctx).Debug("mock extension reached EOF")
+		me.extInfo.Data["numBytes"] = me.numBytes
+		me.extInfo.Data["crc32"] = me.crc32
+	}
+
+	return n, err
+}
+
+func (me *MockExtension) Close() error {
+	if me.failOnClose {
+		return clues.New("mock close error")
+	}
+
+	err := me.innerRc.Close()
+	if err != nil {
+		return err
+	}
+
+	me.extInfo.Data["numBytes"] = me.numBytes
+	me.extInfo.Data["crc32"] = me.crc32
+	logger.Ctx(me.ctx).Infow(
+		"mock extension closed",
+		"numBytes", me.numBytes, "crc32", me.crc32)
+
+	return nil
+}
+
+func NewMockExtension(
+	ctx context.Context,
+	rc io.ReadCloser,
+	info details.ItemInfo,
+	extInfo *details.ExtensionInfo,
+) (CorsoItemExtension, error) {
+	return &MockExtension{
+		ctx:     ctx,
+		innerRc: rc,
+		info:    info,
+		extInfo: extInfo,
+	}, nil
+}