1 files changed, 95 insertions, 0 deletions
diff --git a/spec/support/shared_examples/services/boards/lists_move_service_shared_examples.rb b/spec/support/shared_examples/services/boards/lists_move_service_shared_examples.rb
new file mode 100644
index 00000000000..bf84b912610
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+++ b/spec/support/shared_examples/services/boards/lists_move_service_shared_examples.rb
@@ -0,0 +1,95 @@
+# frozen_string_literal: true
+
+RSpec.shared_examples 'lists move service' do
+  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!(:closed)      { create(:closed_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(parent, user, position: nil)
+
+      service.execute(planning)
+
+      expect(current_list_positions).to eq [0, 1, 2, 3]
+    end
+
+    it 'keeps position of lists when new position is equal to old position' do
+      service = described_class.new(parent, 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 position is negative' do
+      service = described_class.new(parent, user, position: -1)
+
+      service.execute(planning)
+
+      expect(current_list_positions).to eq [0, 1, 2, 3]
+    end
+
+    it 'keeps position of lists when new position is equal to number of labels lists' do
+      service = described_class.new(parent, 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 position is greater than number of labels lists' do
+      service = described_class.new(parent, 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 position is equal to first position' do
+      service = described_class.new(parent, 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 position is equal to last position' do
+      service = described_class.new(parent, 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(parent, 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(parent, 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 closed' do
+    service = described_class.new(parent, user, position: 2)
+
+    service.execute(closed)
+
+    expect(current_list_positions).to eq [0, 1, 2, 3]
+  end
+
+  def current_list_positions
+    [planning, development, review, staging].map { |list| list.reload.position }
+  end
+end