1 files changed, 71 insertions, 0 deletions
diff --git a/spec/services/issuable/process_assignees_spec.rb b/spec/services/issuable/process_assignees_spec.rb
new file mode 100644
index 00000000000..876c84957cc
--- /dev/null
+++ b/spec/services/issuable/process_assignees_spec.rb
@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Issuable::ProcessAssignees do
+  describe '#execute' do
+    it 'returns assignee_ids when assignee_ids are specified' do
+      process = Issuable::ProcessAssignees.new(assignee_ids: %w(5 7 9),
+                                               add_assignee_ids: %w(2 4 6),
+                                               remove_assignee_ids: %w(4 7 11),
+                                               existing_assignee_ids: %w(1 3 9),
+                                               extra_assignee_ids: %w(2 5 12))
+      result = process.execute
+
+      expect(result.sort).to eq(%w(5 7 9).sort)
+    end
+
+    it 'combines other ids when assignee_ids is empty' do
+      process = Issuable::ProcessAssignees.new(assignee_ids: [],
+                                               add_assignee_ids: %w(2 4 6),
+                                               remove_assignee_ids: %w(4 7 11),
+                                               existing_assignee_ids: %w(1 3 11),
+                                               extra_assignee_ids: %w(2 5 12))
+      result = process.execute
+
+      expect(result.sort).to eq(%w(1 2 3 5 6 12).sort)
+    end
+
+    it 'combines other ids when assignee_ids is nil' do
+      process = Issuable::ProcessAssignees.new(assignee_ids: nil,
+                                               add_assignee_ids: %w(2 4 6),
+                                               remove_assignee_ids: %w(4 7 11),
+                                               existing_assignee_ids: %w(1 3 11),
+                                               extra_assignee_ids: %w(2 5 12))
+      result = process.execute
+
+      expect(result.sort).to eq(%w(1 2 3 5 6 12).sort)
+    end
+
+    it 'combines other ids when assignee_ids and add_assignee_ids are nil' do
+      process = Issuable::ProcessAssignees.new(assignee_ids: nil,
+                                               add_assignee_ids: nil,
+                                               remove_assignee_ids: %w(4 7 11),
+                                               existing_assignee_ids: %w(1 3 11),
+                                               extra_assignee_ids: %w(2 5 12))
+      result = process.execute
+
+      expect(result.sort).to eq(%w(1 2 3 5 12).sort)
+    end
+
+    it 'combines other ids when assignee_ids and remove_assignee_ids are nil' do
+      process = Issuable::ProcessAssignees.new(assignee_ids: nil,
+                                               add_assignee_ids: %w(2 4 6),
+                                               remove_assignee_ids: nil,
+                                               existing_assignee_ids: %w(1 3 11),
+                                               extra_assignee_ids: %w(2 5 12))
+      result = process.execute
+
+      expect(result.sort).to eq(%w(1 2 4 3 5 6 11 12).sort)
+    end
+
+    it 'combines ids when only add_assignee_ids and remove_assignee_ids are passed' do
+      process = Issuable::ProcessAssignees.new(assignee_ids: nil,
+                                               add_assignee_ids: %w(2 4 6),
+                                               remove_assignee_ids: %w(4 7 11))
+      result = process.execute
+
+      expect(result.sort).to eq(%w(2 6).sort)
+    end
+  end
+end