diff --git a/integration/sqliterepo.go b/integration/sqliterepo.go
index de419b6..a6d46b2 100644
--- a/integration/sqliterepo.go
+++ b/integration/sqliterepo.go
@@ -38,7 +38,7 @@ func (r SQLiteUserAgentRepository) migrate() error {
 	return err
 }
 
-func (r SQLiteUserAgentRepository) Create(useragent domain.UserAgent) (*domain.UserAgent, error) {
+func (r *SQLiteUserAgentRepository) Create(useragent domain.UserAgent) (*domain.UserAgent, error) {
 	var record, err = fromEntity(useragent)
 	if err != nil {
 
diff --git a/test/domain/services_test.go b/test/domain/services_test.go
index e6ada0d..343da46 100644
--- a/test/domain/services_test.go
+++ b/test/domain/services_test.go
@@ -10,7 +10,7 @@ import (
 
 
 var file_ref1 = domain.FileReference { "path1", "ua1" }
-//var file_ref2 = domain.FileReference { "path1", "ua2" }
+var file_ref2 = domain.FileReference { "path1", "ua2" }
 var file_ref3 = domain.FileReference { "path2", "ua1" }
 
 
@@ -61,7 +61,6 @@ func TestFileIsReadBack(t *testing.T) {
 
 	_ = s.SaveFile(file_ref1, infile, int64(infile.Len()))
 
-
 	outbogfile, _ := s.OpenOutFile(file_ref1)
 
 	outfile := bytes.NewBufferString("")
@@ -71,3 +70,25 @@ func TestFileIsReadBack(t *testing.T) {
 		t.Errorf("file corrupted")
 	}
 }
+
+
+func TestUAIsolation(t *testing.T) {
+	file_repo := mock.NewMockFileRepository()
+	ua_repo := mock.NewMockUserAgentRepository()
+	s := domain.NewBogFileService(ua_repo, file_repo, 1024, time.Hour)
+
+	ua1_file := bytes.NewBufferString("My bog data ua1")
+	ua2_file := bytes.NewBufferString("My bog data ua2")
+
+	_ = s.SaveFile(file_ref1, ua1_file, int64(ua1_file.Len()))
+	_ = s.SaveFile(file_ref2, ua2_file, int64(ua2_file.Len()))
+
+	outbogfile, _ := s.OpenOutFile(file_ref1)
+
+	outfile := bytes.NewBufferString("")
+	_, _ = outfile.ReadFrom(outbogfile)
+
+	if outfile.String() != "My bog data ua1" {
+		t.Errorf("file corrupted")
+	}
+}
diff --git a/test/mock/user_agent.go b/test/mock/user_agent.go
index 3020a49..79c4b04 100644
--- a/test/mock/user_agent.go
+++ b/test/mock/user_agent.go
@@ -12,7 +12,7 @@ type MockUserAgentRepository struct {
 	NextId int64
 }
 
-func NewMockUserAgentRepository() domain.UserAgentRepository{
+func NewMockUserAgentRepository() *MockUserAgentRepository {
 	r := new(MockUserAgentRepository)
 	r.NextId = 0
 	r.IdIdx = make(map[int64]*domain.UserAgent)
@@ -20,7 +20,7 @@ func NewMockUserAgentRepository() domain.UserAgentRepository{
 	return r
 }
 
-func (r MockUserAgentRepository) Create(useragent domain.UserAgent) (*domain.UserAgent, error) {
+func (r *MockUserAgentRepository) Create(useragent domain.UserAgent) (*domain.UserAgent, error) {
 	r.NextId += 1
 	useragent.ID = r.NextId
 
@@ -30,7 +30,7 @@ func (r MockUserAgentRepository) Create(useragent domain.UserAgent) (*domain.Use
 }
 
 
-func (r MockUserAgentRepository) All() ([]domain.UserAgent, error) {
+func (r *MockUserAgentRepository) All() ([]domain.UserAgent, error) {
 	v := make([]domain.UserAgent, 0, len(r.IdIdx))
 
 	for  _, value := range r.IdIdx {
@@ -40,7 +40,7 @@ func (r MockUserAgentRepository) All() ([]domain.UserAgent, error) {
 }
 
 
-func (r MockUserAgentRepository) GetByName(name string) (*domain.UserAgent, error) {
+func (r *MockUserAgentRepository) GetByName(name string) (*domain.UserAgent, error) {
 	useragent, exists := r.NameIdx[name]
 	if exists {
 		return useragent, nil
@@ -49,7 +49,7 @@ func (r MockUserAgentRepository) GetByName(name string) (*domain.UserAgent, erro
 }
 
 
-func (r MockUserAgentRepository) Update(id int64, useragent domain.UserAgent) (*domain.UserAgent, error) {
+func (r *MockUserAgentRepository) Update(id int64, useragent domain.UserAgent) (*domain.UserAgent, error) {
 	original := *r.IdIdx[id]
 	useragent.ID = id
 	r.IdIdx[id] = &useragent
@@ -58,7 +58,7 @@ func (r MockUserAgentRepository) Update(id int64, useragent domain.UserAgent) (*
 }
 
 
-func (r MockUserAgentRepository) Delete(id int64) error {
+func (r *MockUserAgentRepository) Delete(id int64) error {
 	original := *r.IdIdx[id]
 	delete(r.NameIdx, original.Name)
 	delete(r.IdIdx, original.ID)