1 files changed, 796 insertions, 0 deletions

diff --git a/spec/requests/api/issues/issues_spec.rb b/spec/requests/api/issues/issues_spec.rb
new file mode 100644
index 00000000000..9b9cc778fb3
--- /dev/null
+++ b/spec/requests/api/issues/issues_spec.rb
@@ -0,0 +1,796 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe API::Issues do
+  set(:user) { create(:user) }
+  set(:project) do
+    create(:project, :public, creator_id: user.id, namespace: user.namespace)
+  end
+
+  let(:user2)       { create(:user) }
+  let(:non_member)  { create(:user) }
+  set(:guest)       { create(:user) }
+  set(:author)      { create(:author) }
+  set(:assignee)    { create(:assignee) }
+  let(:admin)       { create(:user, :admin) }
+  let(:issue_title)       { 'foo' }
+  let(:issue_description) { 'closed' }
+  let!(:closed_issue) do
+    create :closed_issue,
+           author: user,
+           assignees: [user],
+           project: project,
+           state: :closed,
+           milestone: milestone,
+           created_at: generate(:past_time),
+           updated_at: 3.hours.ago,
+           closed_at: 1.hour.ago
+  end
+  let!(:confidential_issue) do
+    create :issue,
+           :confidential,
+           project: project,
+           author: author,
+           assignees: [assignee],
+           created_at: generate(:past_time),
+           updated_at: 2.hours.ago
+  end
+  let!(:issue) do
+    create :issue,
+           author: user,
+           assignees: [user],
+           project: project,
+           milestone: milestone,
+           created_at: generate(:past_time),
+           updated_at: 1.hour.ago,
+           title: issue_title,
+           description: issue_description
+  end
+  set(:label) do
+    create(:label, title: 'label', color: '#FFAABB', project: project)
+  end
+  let!(:label_link) { create(:label_link, label: label, target: issue) }
+  let(:milestone) { create(:milestone, title: '1.0.0', project: project) }
+  set(:empty_milestone) do
+    create(:milestone, title: '2.0.0', project: project)
+  end
+  let!(:note) { create(:note_on_issue, author: user, project: project, noteable: issue) }
+
+  let(:no_milestone_title) { 'None' }
+  let(:any_milestone_title) { 'Any' }
+
+  before(:all) do
+    project.add_reporter(user)
+    project.add_guest(guest)
+  end
+
+  before do
+    stub_licensed_features(multiple_issue_assignees: false, issue_weights: false)
+  end
+
+  shared_examples 'issues statistics' do
+    it 'returns issues statistics' do
+      get api("/issues_statistics", user), params: params
+
+      expect(response).to have_gitlab_http_status(200)
+      expect(json_response['statistics']).not_to be_nil
+      expect(json_response['statistics']['counts']['all']).to eq counts[:all]
+      expect(json_response['statistics']['counts']['closed']).to eq counts[:closed]
+      expect(json_response['statistics']['counts']['opened']).to eq counts[:opened]
+    end
+  end
+
+  describe 'GET /issues' do
+    context 'when unauthenticated' do
+      it 'returns an array of all issues' do
+        get api('/issues'), params: { scope: 'all' }
+
+        expect(response).to have_http_status(200)
+        expect(json_response).to be_an Array
+      end
+
+      it 'returns authentication error without any scope' do
+        get api('/issues')
+
+        expect(response).to have_http_status(401)
+      end
+
+      it 'returns authentication error when scope is assigned-to-me' do
+        get api('/issues'), params: { scope: 'assigned-to-me' }
+
+        expect(response).to have_http_status(401)
+      end
+
+      it 'returns authentication error when scope is created-by-me' do
+        get api('/issues'), params: { scope: 'created-by-me' }
+
+        expect(response).to have_http_status(401)
+      end
+
+      it 'returns an array of issues matching state in milestone' do
+        get api('/issues'), params: { milestone: 'foo', scope: 'all' }
+
+        expect(response).to have_http_status(200)
+        expect_paginated_array_response([])
+      end
+
+      it 'returns an array of issues matching state in milestone' do
+        get api('/issues'), params: { milestone: milestone.title, scope: 'all' }
+
+        expect(response).to have_http_status(200)
+        expect_paginated_array_response([issue.id, closed_issue.id])
+      end
+
+      context 'issues_statistics' do
+        it 'returns authentication error without any scope' do
+          get api('/issues_statistics')
+
+          expect(response).to have_http_status(401)
+        end
+
+        it 'returns authentication error when scope is assigned_to_me' do
+          get api('/issues_statistics'), params: { scope: 'assigned_to_me' }
+
+          expect(response).to have_http_status(401)
+        end
+
+        it 'returns authentication error when scope is created_by_me' do
+          get api('/issues_statistics'), params: { scope: 'created_by_me' }
+
+          expect(response).to have_http_status(401)
+        end
+
+        context 'no state is treated as all state' do
+          let(:params) { {} }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'statistics when all state is passed' do
+          let(:params) { { state: :all } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'closed state is treated as all state' do
+          let(:params) { { state: :closed } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'opened state is treated as all state' do
+          let(:params) { { state: :opened } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'when filtering by milestone and no state treated as all state' do
+          let(:params) { { milestone: milestone.title } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'when filtering by milestone and all state' do
+          let(:params) { { milestone: milestone.title, state: :all } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'when filtering by milestone and closed state treated as all state' do
+          let(:params) { { milestone: milestone.title, state: :closed } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'when filtering by milestone and opened state treated as all state' do
+          let(:params) { { milestone: milestone.title, state: :opened } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'sort does not affect statistics ' do
+          let(:params) { { state: :opened, order_by: 'updated_at' } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+      end
+    end
+
+    context 'when authenticated' do
+      it 'returns an array of issues' do
+        get api('/issues', user)
+
+        expect_paginated_array_response([issue.id, closed_issue.id])
+        expect(json_response.first['title']).to eq(issue.title)
+        expect(json_response.last).to have_key('web_url')
+      end
+
+      it 'returns an array of closed issues' do
+        get api('/issues', user), params: { state: :closed }
+
+        expect_paginated_array_response(closed_issue.id)
+      end
+
+      it 'returns an array of opened issues' do
+        get api('/issues', user), params: { state: :opened }
+
+        expect_paginated_array_response(issue.id)
+      end
+
+      it 'returns an array of all issues' do
+        get api('/issues', user), params: { state: :all }
+
+        expect_paginated_array_response([issue.id, closed_issue.id])
+      end
+
+      it 'returns issues assigned to me' do
+        issue2 = create(:issue, assignees: [user2], project: project)
+
+        get api('/issues', user2), params: { scope: 'assigned_to_me' }
+
+        expect_paginated_array_response(issue2.id)
+      end
+
+      it 'returns issues assigned to me (kebab-case)' do
+        issue2 = create(:issue, assignees: [user2], project: project)
+
+        get api('/issues', user2), params: { scope: 'assigned-to-me' }
+
+        expect_paginated_array_response(issue2.id)
+      end
+
+      it 'returns issues authored by the given author id' do
+        issue2 = create(:issue, author: user2, project: project)
+
+        get api('/issues', user), params: { author_id: user2.id, scope: 'all' }
+
+        expect_paginated_array_response(issue2.id)
+      end
+
+      it 'returns issues assigned to the given assignee id' do
+        issue2 = create(:issue, assignees: [user2], project: project)
+
+        get api('/issues', user), params: { assignee_id: user2.id, scope: 'all' }
+
+        expect_paginated_array_response(issue2.id)
+      end
+
+      it 'returns issues authored by the given author id and assigned to the given assignee id' do
+        issue2 = create(:issue, author: user2, assignees: [user2], project: project)
+
+        get api('/issues', user), params: { author_id: user2.id, assignee_id: user2.id, scope: 'all' }
+
+        expect_paginated_array_response(issue2.id)
+      end
+
+      it 'returns issues with no assignee' do
+        issue2 = create(:issue, author: user2, project: project)
+
+        get api('/issues', user), params: { assignee_id: 0, scope: 'all' }
+
+        expect_paginated_array_response(issue2.id)
+      end
+
+      it 'returns issues with no assignee' do
+        issue2 = create(:issue, author: user2, project: project)
+
+        get api('/issues', user), params: { assignee_id: 'None', scope: 'all' }
+
+        expect_paginated_array_response(issue2.id)
+      end
+
+      it 'returns issues with any assignee' do
+        # This issue without assignee should not be returned
+        create(:issue, author: user2, project: project)
+
+        get api('/issues', user), params: { assignee_id: 'Any', scope: 'all' }
+
+        expect_paginated_array_response([issue.id, confidential_issue.id, closed_issue.id])
+      end
+
+      it 'returns only confidential issues' do
+        get api('/issues', user), params: { confidential: true, scope: 'all' }
+
+        expect_paginated_array_response(confidential_issue.id)
+      end
+
+      it 'returns only public issues' do
+        get api('/issues', user), params: { confidential: false }
+
+        expect_paginated_array_response([issue.id, closed_issue.id])
+      end
+
+      it 'returns issues reacted by the authenticated user' do
+        issue2 = create(:issue, project: project, author: user, assignees: [user])
+        create(:award_emoji, awardable: issue2, user: user2, name: 'star')
+        create(:award_emoji, awardable: issue, user: user2, name: 'thumbsup')
+
+        get api('/issues', user2), params: { my_reaction_emoji: 'Any', scope: 'all' }
+
+        expect_paginated_array_response([issue2.id, issue.id])
+      end
+
+      it 'returns issues not reacted by the authenticated user' do
+        issue2 = create(:issue, project: project, author: user, assignees: [user])
+        create(:award_emoji, awardable: issue2, user: user2, name: 'star')
+
+        get api('/issues', user2), params: { my_reaction_emoji: 'None', scope: 'all' }
+
+        expect_paginated_array_response([issue.id, closed_issue.id])
+      end
+
+      it 'returns issues matching given search string for title' do
+        get api('/issues', user), params: { search: issue.title }
+
+        expect_paginated_array_response(issue.id)
+      end
+
+      it 'returns issues matching given search string for title and scoped in title' do
+        get api('/issues', user), params: { search: issue.title, in: 'title' }
+
+        expect_paginated_array_response(issue.id)
+      end
+
+      it 'returns an empty array if no issue matches given search string for title and scoped in description' do
+        get api('/issues', user), params: { search: issue.title, in: 'description' }
+
+        expect_paginated_array_response([])
+      end
+
+      it 'returns issues matching given search string for description' do
+        get api('/issues', user), params: { search: issue.description }
+
+        expect_paginated_array_response(issue.id)
+      end
+
+      context 'filtering before a specific date' do
+        let!(:issue2) { create(:issue, project: project, author: user, created_at: Date.new(2000, 1, 1), updated_at: Date.new(2000, 1, 1)) }
+
+        it 'returns issues created before a specific date' do
+          get api('/issues?created_before=2000-01-02T00:00:00.060Z', user)
+
+          expect_paginated_array_response(issue2.id)
+        end
+
+        it 'returns issues updated before a specific date' do
+          get api('/issues?updated_before=2000-01-02T00:00:00.060Z', user)
+
+          expect_paginated_array_response(issue2.id)
+        end
+      end
+
+      context 'filtering after a specific date' do
+        let!(:issue2) { create(:issue, project: project, author: user, created_at: 1.week.from_now, updated_at: 1.week.from_now) }
+
+        it 'returns issues created after a specific date' do
+          get api("/issues?created_after=#{issue2.created_at}", user)
+
+          expect_paginated_array_response(issue2.id)
+        end
+
+        it 'returns issues updated after a specific date' do
+          get api("/issues?updated_after=#{issue2.updated_at}", user)
+
+          expect_paginated_array_response(issue2.id)
+        end
+      end
+
+      context 'filter by labels or label_name param' do
+        context 'N+1' do
+          let(:label_b) { create(:label, title: 'foo', project: project) }
+          let(:label_c) { create(:label, title: 'bar', project: project) }
+
+          before do
+            create(:label_link, label: label_b, target: issue)
+            create(:label_link, label: label_c, target: issue)
+          end
+          it 'tests N+1' do
+            control = ActiveRecord::QueryRecorder.new do
+              get api('/issues', user), params: { labels: [label.title, label_b.title, label_c.title] }
+            end
+
+            label_d = create(:label, title: 'dar', project: project)
+            label_e = create(:label, title: 'ear', project: project)
+            create(:label_link, label: label_d, target: issue)
+            create(:label_link, label: label_e, target: issue)
+
+            expect do
+              get api('/issues', user), params: { labels: [label.title, label_b.title, label_c.title] }
+            end.not_to exceed_query_limit(control)
+            expect(issue.labels.count).to eq(5)
+          end
+        end
+
+        it 'returns an array of labeled issues' do
+          get api('/issues', user), params: { labels: label.title }
+
+          expect_paginated_array_response(issue.id)
+          expect(json_response.first['labels']).to eq([label.title])
+        end
+
+        it 'returns an array of labeled issues with labels param as array' do
+          get api('/issues', user), params: { labels: [label.title] }
+
+          expect_paginated_array_response(issue.id)
+          expect(json_response.first['labels']).to eq([label.title])
+        end
+
+        context 'with labeled issues' do
+          let(:label_b) { create(:label, title: 'foo', project: project) }
+          let(:label_c) { create(:label, title: 'bar', project: project) }
+
+          before do
+            create(:label_link, label: label_b, target: issue)
+            create(:label_link, label: label_c, target: issue)
+
+            get api('/issues', user), params: params
+          end
+
+          it_behaves_like 'labeled issues with labels and label_name params'
+        end
+
+        it 'returns an empty array if no issue matches labels' do
+          get api('/issues', user), params: { labels: 'foo,bar' }
+
+          expect_paginated_array_response([])
+        end
+
+        it 'returns an empty array if no issue matches labels with labels param as array' do
+          get api('/issues', user), params: { labels: %w(foo bar) }
+
+          expect_paginated_array_response([])
+        end
+
+        it 'returns an array of labeled issues matching given state' do
+          get api('/issues', user), params: { labels: label.title, state: :opened }
+
+          expect_paginated_array_response(issue.id)
+          expect(json_response.first['labels']).to eq([label.title])
+          expect(json_response.first['state']).to eq('opened')
+        end
+
+        it 'returns an array of labeled issues matching given state with labels param as array' do
+          get api('/issues', user), params: { labels: [label.title], state: :opened }
+
+          expect_paginated_array_response(issue.id)
+          expect(json_response.first['labels']).to eq([label.title])
+          expect(json_response.first['state']).to eq('opened')
+        end
+
+        it 'returns an empty array if no issue matches labels and state filters' do
+          get api('/issues', user), params: { labels: label.title, state: :closed }
+
+          expect_paginated_array_response([])
+        end
+
+        it 'returns an array of issues with any label' do
+          get api('/issues', user), params: { labels: IssuesFinder::FILTER_ANY }
+
+          expect_paginated_array_response(issue.id)
+        end
+
+        it 'returns an array of issues with any label with labels param as array' do
+          get api('/issues', user), params: { labels: [IssuesFinder::FILTER_ANY] }
+
+          expect_paginated_array_response(issue.id)
+        end
+
+        it 'returns an array of issues with no label' do
+          get api('/issues', user), params: { labels: IssuesFinder::FILTER_NONE }
+
+          expect_paginated_array_response(closed_issue.id)
+        end
+
+        it 'returns an array of issues with no label with labels param as array' do
+          get api('/issues', user), params: { labels: [IssuesFinder::FILTER_NONE] }
+
+          expect_paginated_array_response(closed_issue.id)
+        end
+
+        it 'returns an array of issues with no label when using the legacy No+Label filter' do
+          get api('/issues', user), params: { labels: 'No Label' }
+
+          expect_paginated_array_response(closed_issue.id)
+        end
+
+        it 'returns an array of issues with no label when using the legacy No+Label filter with labels param as array' do
+          get api('/issues', user), params: { labels: ['No Label'] }
+
+          expect_paginated_array_response(closed_issue.id)
+        end
+      end
+
+      it 'returns an empty array if no issue matches milestone' do
+        get api("/issues?milestone=#{empty_milestone.title}", user)
+
+        expect_paginated_array_response([])
+      end
+
+      it 'returns an empty array if milestone does not exist' do
+        get api('/issues?milestone=foo', user)
+
+        expect_paginated_array_response([])
+      end
+
+      it 'returns an array of issues in given milestone' do
+        get api("/issues?milestone=#{milestone.title}", user)
+
+        expect_paginated_array_response([issue.id, closed_issue.id])
+      end
+
+      it 'returns an array of issues in given milestone_title param' do
+        get api("/issues?milestone_title=#{milestone.title}", user)
+
+        expect_paginated_array_response([issue.id, closed_issue.id])
+      end
+
+      it 'returns an array of issues matching state in milestone' do
+        get api("/issues?milestone=#{milestone.title}&state=closed", user)
+
+        expect_paginated_array_response(closed_issue.id)
+      end
+
+      it 'returns an array of issues with no milestone' do
+        get api("/issues?milestone=#{no_milestone_title}", author)
+
+        expect_paginated_array_response(confidential_issue.id)
+      end
+
+      it 'returns an array of issues with no milestone using milestone_title param' do
+        get api("/issues?milestone_title=#{no_milestone_title}", author)
+
+        expect_paginated_array_response(confidential_issue.id)
+      end
+
+      it 'returns an array of issues found by iids' do
+        get api('/issues', user), params: { iids: [closed_issue.iid] }
+
+        expect_paginated_array_response(closed_issue.id)
+      end
+
+      it 'returns an empty array if iid does not exist' do
+        get api('/issues', user), params: { iids: [0] }
+
+        expect_paginated_array_response([])
+      end
+
+      context 'without sort params' do
+        it 'sorts by created_at descending by default' do
+          get api('/issues', user)
+
+          expect_paginated_array_response([issue.id, closed_issue.id])
+        end
+
+        context 'with 2 issues with same created_at' do
+          let!(:closed_issue2) do
+            create :closed_issue,
+                   author: user,
+                   assignees: [user],
+                   project: project,
+                   milestone: milestone,
+                   created_at: closed_issue.created_at,
+                   updated_at: 1.hour.ago,
+                   title: issue_title,
+                   description: issue_description
+          end
+
+          it 'page breaks first page correctly' do
+            get api('/issues?per_page=2', user)
+
+            expect_paginated_array_response([issue.id, closed_issue2.id])
+          end
+
+          it 'page breaks second page correctly' do
+            get api('/issues?per_page=2&page=2', user)
+
+            expect_paginated_array_response([closed_issue.id])
+          end
+        end
+      end
+
+      it 'sorts ascending when requested' do
+        get api('/issues?sort=asc', user)
+
+        expect_paginated_array_response([closed_issue.id, issue.id])
+      end
+
+      it 'sorts by updated_at descending when requested' do
+        get api('/issues?order_by=updated_at', user)
+
+        issue.touch(:updated_at)
+
+        expect_paginated_array_response([issue.id, closed_issue.id])
+      end
+
+      it 'sorts by updated_at ascending when requested' do
+        get api('/issues?order_by=updated_at&sort=asc', user)
+
+        issue.touch(:updated_at)
+
+        expect_paginated_array_response([closed_issue.id, issue.id])
+      end
+
+      it 'matches V4 response schema' do
+        get api('/issues', user)
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(response).to match_response_schema('public_api/v4/issues')
+      end
+
+      it 'returns a related merge request count of 0 if there are no related merge requests' do
+        get api('/issues', user)
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(response).to match_response_schema('public_api/v4/issues')
+        expect(json_response.first).to include('merge_requests_count' => 0)
+      end
+
+      it 'returns a related merge request count > 0 if there are related merge requests' do
+        create(:merge_requests_closing_issues, issue: issue)
+
+        get api('/issues', user)
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(response).to match_response_schema('public_api/v4/issues')
+        expect(json_response.first).to include('merge_requests_count' => 1)
+      end
+
+      context 'issues_statistics' do
+        context 'no state is treated as all state' do
+          let(:params) { {} }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'statistics when all state is passed' do
+          let(:params) { { state: :all } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'closed state is treated as all state' do
+          let(:params) { { state: :closed } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'opened state is treated as all state' do
+          let(:params) { { state: :opened } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'when filtering by milestone and no state treated as all state' do
+          let(:params) { { milestone: milestone.title } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'when filtering by milestone and all state' do
+          let(:params) { { milestone: milestone.title, state: :all } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'when filtering by milestone and closed state treated as all state' do
+          let(:params) { { milestone: milestone.title, state: :closed } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'when filtering by milestone and opened state treated as all state' do
+          let(:params) { { milestone: milestone.title, state: :opened } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+
+        context 'sort does not affect statistics ' do
+          let(:params) { { state: :opened, order_by: 'updated_at' } }
+          let(:counts) { { all: 2, closed: 1, opened: 1 } }
+
+          it_behaves_like 'issues statistics'
+        end
+      end
+
+      context 'filtering by assignee_username' do
+        let(:another_assignee) { create(:assignee) }
+        let!(:issue1) { create(:issue, author: user2, project: project, created_at: 3.days.ago) }
+        let!(:issue2) { create(:issue, author: user2, project: project, created_at: 2.days.ago) }
+        let!(:issue3) { create(:issue, author: user2, assignees: [assignee, another_assignee], project: project, created_at: 1.day.ago) }
+
+        it 'returns issues with by assignee_username' do
+          get api("/issues", user), params: { assignee_username: [assignee.username], scope: 'all' }
+
+          expect(issue3.reload.assignees.pluck(:id)).to match_array([assignee.id, another_assignee.id])
+          expect_paginated_array_response([confidential_issue.id, issue3.id])
+        end
+
+        it 'returns issues by assignee_username as string' do
+          get api("/issues", user), params: { assignee_username: assignee.username, scope: 'all' }
+
+          expect(issue3.reload.assignees.pluck(:id)).to match_array([assignee.id, another_assignee.id])
+          expect_paginated_array_response([confidential_issue.id, issue3.id])
+        end
+
+        it 'returns error when multiple assignees are passed' do
+          get api("/issues", user), params: { assignee_username: [assignee.username, another_assignee.username], scope: 'all' }
+
+          expect(response).to have_gitlab_http_status(400)
+          expect(json_response["error"]).to include("allows one value, but found 2")
+        end
+
+        it 'returns error when assignee_username and assignee_id are passed together' do
+          get api("/issues", user), params: { assignee_username: [assignee.username], assignee_id: another_assignee.id, scope: 'all' }
+
+          expect(response).to have_gitlab_http_status(400)
+          expect(json_response["error"]).to include("mutually exclusive")
+        end
+      end
+    end
+  end
+
+  describe 'DELETE /projects/:id/issues/:issue_iid' do
+    it 'rejects a non member from deleting an issue' do
+      delete api("/projects/#{project.id}/issues/#{issue.iid}", non_member)
+      expect(response).to have_gitlab_http_status(403)
+    end
+
+    it 'rejects a developer from deleting an issue' do
+      delete api("/projects/#{project.id}/issues/#{issue.iid}", author)
+      expect(response).to have_gitlab_http_status(403)
+    end
+
+    context 'when the user is project owner' do
+      let(:owner)     { create(:user) }
+      let(:project)   { create(:project, namespace: owner.namespace) }
+
+      it 'deletes the issue if an admin requests it' do
+        delete api("/projects/#{project.id}/issues/#{issue.iid}", owner)
+
+        expect(response).to have_gitlab_http_status(204)
+      end
+
+      it_behaves_like '412 response' do
+        let(:request) { api("/projects/#{project.id}/issues/#{issue.iid}", owner) }
+      end
+    end
+
+    context 'when issue does not exist' do
+      it 'returns 404 when trying to move an issue' do
+        delete api("/projects/#{project.id}/issues/123", user)
+
+        expect(response).to have_gitlab_http_status(404)
+      end
+    end
+
+    it 'returns 404 when using the issue ID instead of IID' do
+      delete api("/projects/#{project.id}/issues/#{issue.id}", user)
+
+      expect(response).to have_gitlab_http_status(404)
+    end
+  end
+
+  describe 'time tracking endpoints' do
+    let(:issuable) { issue }
+
+    include_examples 'time tracking endpoints', 'issue'
+  end
+end