1 files changed, 110 insertions, 0 deletions
diff --git a/spec/services/boards/lists/move_service_spec.rb b/spec/services/boards/lists/move_service_spec.rb
new file mode 100644
index 00000000000..3e9b7d07fc6
--- /dev/null
+++ b/spec/services/boards/lists/move_service_spec.rb
@@ -0,0 +1,110 @@
+require 'spec_helper'
+
+describe Boards::Lists::MoveService, services: true do
+  describe '#execute' do
+    let(:project) { create(:project_with_board) }
+    let(:board)   { project.board }
+    let(:user)    { create(:user) }
+
+    let!(:backlog)     { create(:backlog_list, board: board) }
+    let!(:planning)    { create(:list, board: board, position: 0) }
+    let!(:development) { create(:list, board: board, position: 1) }
+    let!(:review)      { create(:list, board: board, position: 2) }
+    let!(:staging)     { create(:list, board: board, position: 3) }
+    let!(:done)        { create(:done_list, board: board) }
+
+    context 'when list type is set to label' do
+      it 'keeps position of lists when new position is nil' do
+        service = described_class.new(project, user, position: nil)
+
+        service.execute(planning)
+
+        expect(current_list_positions).to eq [0, 1, 2, 3]
+      end
+
+      it 'keeps position of lists when new positon is equal to old position' do
+        service = described_class.new(project, user, position: planning.position)
+
+        service.execute(planning)
+
+        expect(current_list_positions).to eq [0, 1, 2, 3]
+      end
+
+      it 'keeps position of lists when new positon is negative' do
+        service = described_class.new(project, user, position: -1)
+
+        service.execute(planning)
+
+        expect(current_list_positions).to eq [0, 1, 2, 3]
+      end
+
+      it 'keeps position of lists when new positon is equal to number of labels lists' do
+        service = described_class.new(project, user, position: board.lists.label.size)
+
+        service.execute(planning)
+
+        expect(current_list_positions).to eq [0, 1, 2, 3]
+      end
+
+      it 'keeps position of lists when new positon is greater than number of labels lists' do
+        service = described_class.new(project, user, position: board.lists.label.size + 1)
+
+        service.execute(planning)
+
+        expect(current_list_positions).to eq [0, 1, 2, 3]
+      end
+
+      it 'increments position of intermediate lists when new positon is equal to first position' do
+        service = described_class.new(project, user, position: 0)
+
+        service.execute(staging)
+
+        expect(current_list_positions).to eq [1, 2, 3, 0]
+      end
+
+      it 'decrements position of intermediate lists when new positon is equal to last position' do
+        service = described_class.new(project, user, position: board.lists.label.last.position)
+
+        service.execute(planning)
+
+        expect(current_list_positions).to eq [3, 0, 1, 2]
+      end
+
+      it 'decrements position of intermediate lists when new position is greater than old position' do
+        service = described_class.new(project, user, position: 2)
+
+        service.execute(planning)
+
+        expect(current_list_positions).to eq [2, 0, 1, 3]
+      end
+
+      it 'increments position of intermediate lists when new position is lower than old position' do
+        service = described_class.new(project, user, position: 1)
+
+        service.execute(staging)
+
+        expect(current_list_positions).to eq [0, 2, 3, 1]
+      end
+    end
+
+    it 'keeps position of lists when list type is backlog' do
+      service = described_class.new(project, user, position: 2)
+
+      service.execute(backlog)
+
+      expect(current_list_positions).to eq [0, 1, 2, 3]
+    end
+
+    it 'keeps position of lists when list type is done' do
+      service = described_class.new(project, user, position: 2)
+
+      service.execute(done)
+
+      expect(current_list_positions).to eq [0, 1, 2, 3]
+    end
+  end
+
+  def current_list_positions
+    [planning, development, review, staging].map { |list| list.reload.position }
+  end
+end