Begin conversion

public/app/core/specs/backend_srv.jest.ts

+import { BackendSrv } from 'app/core/services/backend_srv';
+jest.mock('app/core/store');
+
+describe('backend_srv', function() {
+  let _httpBackend = options => {
+    if (options.method === 'GET' && options.url === 'gateway-error') {
+      return Promise.reject({ status: 502 });
+    } else if (options.method === 'POST') {
+      // return Promise.resolve({});
+    }
+    return Promise.resolve({});
+  };
+
+  let _backendSrv = new BackendSrv(_httpBackend, {}, {}, {}, {});
+
+  //   beforeEach(angularMocks.module('grafana.core'));
+  //   beforeEach(angularMocks.module('grafana.services'));
+  //   beforeEach(
+  //     angularMocks.inject(function($httpBackend, $http, backendSrv) {
+  //       _httpBackend = $httpBackend;
+  //       _backendSrv = backendSrv;
+  //     })
+  //   );
+
+  describe('when handling errors', function() {
+    it('should return the http status code', function(done) {
+      //   _httpBackend.whenGET('gateway-error').respond(502);
+      _backendSrv
+        .datasourceRequest({
+          url: 'gateway-error',
+        })
+        .catch(function(err) {
+          expect(err.status).toBe(502);
+          done();
+        });
+      //   _httpBackend.flush();
+    });
+  });
+});