1 files changed, 65 insertions, 0 deletions
diff --git a/spec/migrations/add_foreign_keys_to_todos_spec.rb b/spec/migrations/add_foreign_keys_to_todos_spec.rb
new file mode 100644
index 00000000000..4a22bd6f342
--- /dev/null
+++ b/spec/migrations/add_foreign_keys_to_todos_spec.rb
@@ -0,0 +1,65 @@
+require 'spec_helper'
+require Rails.root.join('db', 'migrate', '20180201110056_add_foreign_keys_to_todos.rb')
+
+describe AddForeignKeysToTodos, :migration do
+  let(:todos) { table(:todos) }
+
+  let(:project) { create(:project) }
+  let(:user) { create(:user) }
+
+  context 'add foreign key on user_id' do
+    let!(:todo_with_user) { create_todo(user_id: user.id) }
+    let!(:todo_without_user) { create_todo(user_id: 4711) }
+
+    it 'removes orphaned todos without corresponding user' do
+      expect { migrate! }.to change { Todo.count }.from(2).to(1)
+    end
+
+    it 'does not remove entries with valid user_id' do
+      expect { migrate! }.not_to change { todo_with_user.reload }
+    end
+  end
+
+  context 'add foreign key on author_id' do
+    let!(:todo_with_author) { create_todo(author_id: user.id) }
+    let!(:todo_with_invalid_author) { create_todo(author_id: 4711) }
+
+    it 'removes orphaned todos by author_id' do
+      expect { migrate! }.to change { Todo.count }.from(2).to(1)
+    end
+
+    it 'does not touch author_id for valid entries' do
+      expect { migrate! }.not_to change { todo_with_author.reload }
+    end
+  end
+
+  context 'add foreign key on note_id' do
+    let(:note) { create(:note) }
+    let!(:todo_with_note) { create_todo(note_id: note.id) }
+    let!(:todo_with_invalid_note) { create_todo(note_id: 4711) }
+    let!(:todo_without_note) { create_todo(note_id: nil) }
+
+    it 'deletes todo if note_id is set but does not exist in notes table' do
+      expect { migrate! }.to change { Todo.count }.from(3).to(2)
+    end
+
+    it 'does not touch entry if note_id is nil' do
+      expect { migrate! }.not_to change { todo_without_note.reload }
+    end
+
+    it 'does not touch note_id for valid entries' do
+      expect { migrate! }.not_to change { todo_with_note.reload }
+    end
+  end
+
+  def create_todo(**opts)
+    todos.create!(
+      project_id: project.id,
+      user_id: user.id,
+      author_id: user.id,
+      target_type: '',
+      action: 0,
+      state: '', **opts
+    )
+  end
+end