diff --git a/models/fixtures/repository.yml b/models/fixtures/repository.yml
index d50b88c3013..873eb612c7b 100644
--- a/models/fixtures/repository.yml
+++ b/models/fixtures/repository.yml
@@ -105,3 +105,29 @@
   num_pulls: 0
   num_closed_pulls: 0
   is_mirror: false
+
+-
+  id: 10
+  owner_id: 12
+  lower_name: repo10
+  name: repo10
+  is_private: false
+  num_issues: 0
+  num_closed_issues: 0
+  num_pulls: 0
+  num_closed_pulls: 0
+  is_mirror: false
+  num_forks: 1
+
+-
+  id: 11
+  fork_id: 10
+  owner_id: 13
+  lower_name: repo11
+  name: repo11
+  is_private: false
+  num_issues: 0
+  num_closed_issues: 0
+  num_pulls: 0
+  num_closed_pulls: 0
+  is_mirror: false
diff --git a/models/fixtures/user.yml b/models/fixtures/user.yml
index 337fb54590d..8874498c916 100644
--- a/models/fixtures/user.yml
+++ b/models/fixtures/user.yml
@@ -164,3 +164,33 @@
   avatar_email: user11@example.com
   num_repos: 1
   is_active: true
+
+-
+  id: 12
+  lower_name: user12
+  name: user12
+  full_name: User 12
+  email: user12@example.com
+  passwd: password
+  type: 0 # individual
+  salt: salt
+  is_admin: false
+  avatar: avatar12
+  avatar_email: user12@example.com
+  num_repos: 1
+  is_active: true
+
+-
+  id: 13
+  lower_name: user13
+  name: user13
+  full_name: User 13
+  email: user13@example.com
+  passwd: password
+  type: 0 # individual
+  salt: salt
+  is_admin: false
+  avatar: avatar13
+  avatar_email: user13@example.com
+  num_repos: 1
+  is_active: true
diff --git a/models/repo_test.go b/models/repo_test.go
index 18da682059b..7c0e94a5aed 100644
--- a/models/repo_test.go
+++ b/models/repo_test.go
@@ -92,3 +92,36 @@ func TestUpdateRepositoryVisibilityChanged(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, true, act.IsPrivate)
 }
+
+func TestGetUserFork(t *testing.T) {
+	assert.NoError(t, PrepareTestDatabase())
+
+	// User13 has repo 11 forked from repo10
+	repo, err := GetRepositoryByID(10)
+	assert.NoError(t, err)
+	assert.NotNil(t, repo)
+	repo, err = repo.GetUserFork(13)
+	assert.NoError(t, err)
+	assert.NotNil(t, repo)
+
+	repo, err = GetRepositoryByID(9)
+	assert.NoError(t, err)
+	assert.NotNil(t, repo)
+	repo, err = repo.GetUserFork(13)
+	assert.NoError(t, err)
+	assert.Nil(t, repo)
+}
+
+func TestForkRepository(t *testing.T) {
+	assert.NoError(t, PrepareTestDatabase())
+
+	// User13 has repo 11 forked from repo10
+	repo, err := GetRepositoryByID(10)
+	assert.NoError(t, err)
+	assert.NotNil(t, repo)
+
+	repo, err = ForkRepository(&User{ID: 13}, repo, "test", "test")
+	assert.Nil(t, repo)
+	assert.Error(t, err)
+	assert.True(t, IsErrRepoAlreadyExist(err))
+}