Add specs for Error Tracking API

changelogs/unreleased/error-tracking-api.yml

+---
+title: Add API for getting sentry error tracking settings of a project
+merge_request: 21788
+author:
+type: added

spec/requests/api/error_tracking_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe API::ErrorTracking do
+  describe "GET sentry project settings" do
+    let(:admin) { create(:admin) }
+    let(:project_not_found_message) { "404 Project Not Found" }
+    let(:unauthorized_message) { "401 Unauthorized" }
+    let(:random_user) { create(:user) }
+    let(:project_error_tracking_setting) { create(:project_error_tracking_setting) }
+    let(:project) do
+      create(:project, :repository, creator: admin,
+        namespace: admin.namespace, error_tracking_setting: project_error_tracking_setting)
+    end
+
+    context 'when user has permission to view settings' do
+      it 'returns 200' do
+        get api("/projects/#{project.id}/error_tracking/sentry_project_settings", admin)
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(json_response["project_name"]).to eq(project_error_tracking_setting.project_name)
+        expect(json_response["sentry_external_url"]).to eq(project_error_tracking_setting.sentry_external_url)
+      end
+    end
+
+    context 'When user does not own the project' do
+      it 'returns 404' do
+        get api("/projects/#{project.id}/error_tracking/sentry_project_settings", random_user)
+        expect(response).to have_gitlab_http_status(404)
+        expect(json_response["message"]).to eq(project_not_found_message)
+      end
+    end
+
+    context 'When unauthenticated' do
+      it 'return 401' do
+        get api("/projects/#{project.id}/error_tracking/sentry_project_settings")
+        expect(response).to have_gitlab_http_status(401)
+        expect(json_response["message"]).to eq(unauthorized_message)
+      end
+    end
+  end
+end