1 files changed, 98 insertions, 0 deletions
diff --git a/spec/requests/api/graphql/boards/board_list_query_spec.rb b/spec/requests/api/graphql/boards/board_list_query_spec.rb
new file mode 100644
index 00000000000..dec7ca715f2
--- /dev/null
+++ b/spec/requests/api/graphql/boards/board_list_query_spec.rb
@@ -0,0 +1,98 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Querying a Board list' do
+  include GraphqlHelpers
+
+  let_it_be(:current_user) { create(:user) }
+  let_it_be(:project) { create(:project) }
+  let_it_be(:board) { create(:board, resource_parent: project) }
+  let_it_be(:label) { create(:label, project: project, name: 'foo') }
+  let_it_be(:list) { create(:list, board: board, label: label) }
+  let_it_be(:issue1) { create(:issue, project: project, labels: [label]) }
+  let_it_be(:issue2) { create(:issue, project: project, labels: [label], assignees: [current_user]) }
+
+  let(:filters) { {} }
+  let(:query) do
+    graphql_query_for(
+      :board_list,
+      { id: list.to_global_id.to_s, issueFilters: filters },
+      %w[title issuesCount]
+    )
+  end
+
+  subject { graphql_data['boardList'] }
+
+  before do
+    post_graphql(query, current_user: current_user)
+  end
+
+  context 'when the user has access to the list' do
+    before_all do
+      project.add_guest(current_user)
+    end
+
+    it_behaves_like 'a working graphql query'
+
+    it { is_expected.to include({ 'issuesCount' => 2, 'title' => list.title }) }
+
+    context 'with matching issue filters' do
+      let(:filters) { { assigneeUsername: current_user.username } }
+
+      it 'filters issues metadata' do
+        is_expected.to include({ 'issuesCount' => 1, 'title' => list.title })
+      end
+    end
+
+    context 'with unmatching issue filters' do
+      let(:filters) { { assigneeUsername: 'foo' } }
+
+      it 'filters issues metadata' do
+        is_expected.to include({ 'issuesCount' => 0, 'title' => list.title })
+      end
+    end
+  end
+
+  context 'when the user does not have access to the list' do
+    it { is_expected.to be_nil }
+  end
+
+  context 'when ID argument is missing' do
+    let(:query) do
+      graphql_query_for('boardList', {}, 'title')
+    end
+
+    it 'raises an exception' do
+      expect(graphql_errors).to include(a_hash_including('message' => "Field 'boardList' is missing required arguments: id"))
+    end
+  end
+
+  context 'when list ID is not found' do
+    let(:query) do
+      graphql_query_for('boardList', { id: "gid://gitlab/List/#{non_existing_record_id}" }, 'title')
+    end
+
+    it { is_expected.to be_nil }
+  end
+
+  it 'does not have an N+1 performance issue' do
+    a, b = create_list(:list, 2, board: board)
+    ctx = { current_user: current_user }
+    project.add_guest(current_user)
+
+    baseline = graphql_query_for(:board_list, { id: global_id_of(a) }, 'title')
+    query = <<~GQL
+      query {
+        a: #{query_graphql_field(:board_list, { id: global_id_of(a) }, 'title')}
+        b: #{query_graphql_field(:board_list, { id: global_id_of(b) }, 'title')}
+      }
+    GQL
+
+    control = ActiveRecord::QueryRecorder.new do
+      run_with_clean_state(baseline, context: ctx)
+    end
+
+    expect { run_with_clean_state(query, context: ctx) }.not_to exceed_query_limit(control)
+  end
+end