Start working on tests

x-pack/plugins/watcher/server/routes/api/indices/register_get_index_patterns_route.test.ts

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+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { kibanaResponseFactory } from 'src/core/server';
+import { createMockRouter, MockRouter, routeHandlerContextMock } from './__mocks__/routes.mock';
+import { createRequestMock } from './__mocks__/request.mock';
+import { handleEsError } from '../../../shared_imports';
+
+jest.mock('../lib/es_version_precheck', () => ({
+  versionCheckHandlerWrapper: (a: any) => a,
+}));
+
+import { registerGetIndexPatternsRoute } from './register_get_index_patterns_route';
+
+/**
+ * Since these route callbacks are so thin, these serve simply as integration tests
+ * to ensure they're wired up to the lib functions correctly.
+ */
+describe('GET index patterns API', () => {
+  let mockRouter: MockRouter;
+  let routeDependencies: any;
+
+  beforeEach(() => {
+    mockRouter = createMockRouter();
+    routeDependencies = {
+      router: mockRouter,
+      lib: { handleEsError },
+    };
+    registerSystemIndicesMigrationRoutes(routeDependencies);
+  });
+
+  afterEach(() => {
+    jest.resetAllMocks();
+  });
+
+  describe('GET /api/watcher/indices/index_patterns', () => {
+    it('returns system indices migration status', async () => {
+      (
+        routeHandlerContextMock.core.elasticsearch.client.asCurrentUser.transport
+          .request as jest.Mock
+      ).mockResolvedValue({
+        body: mockedResponse,
+      });
+
+      const resp = await routeDependencies.router.getHandler({
+        method: 'get',
+        pathPattern: '/api/upgrade_assistant/system_indices_migration',
+      })(routeHandlerContextMock, createRequestMock(), kibanaResponseFactory);
+
+      expect(resp.status).toEqual(200);
+      expect(
+        routeHandlerContextMock.core.elasticsearch.client.asCurrentUser.transport.request
+      ).toHaveBeenCalledWith({
+        method: 'GET',
+        path: '/_migration/system_features',
+      });
+      expect(resp.payload).toEqual({
+        ...mockedResponse,
+        features: mockedResponse.features.filter(
+          (feature) => feature.migration_status !== 'NO_MIGRATION_NEEDED'
+        ),
+      });
+    });
+
+    it('returns an error if it throws', async () => {
+      (
+        routeHandlerContextMock.core.elasticsearch.client.asCurrentUser.transport
+          .request as jest.Mock
+      ).mockRejectedValue(new Error('scary error!'));
+      await expect(
+        routeDependencies.router.getHandler({
+          method: 'get',
+          pathPattern: '/api/upgrade_assistant/system_indices_migration',
+        })(routeHandlerContextMock, createRequestMock(), kibanaResponseFactory)
+      ).rejects.toThrow('scary error!');
+    });
+  });
+});