fix(testing): provide more descriptive message when the target projec…

…t does not have targets defined.

when trying to add cypress to a project that does not contain targets the project will error
out because of a null reference.
Now when trying to add to a project without a serve target a more
descriptive message is logged stating to add a serve target or use the --baseUrl flag
Note: a future
update should add the parameter to override what target to use if so desired.

ISSUES CLOSED: #9756

packages/cypress/src/generators/cypress-project/__snapshots__/cypress-project.spec.ts.snap

@@ -1,5 +1,20 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`schematic:cypress-project Cypress Project --project should not throw an error when --project does not have targets 1`] = `
+Object {
+  "configurations": Object {
+    "production": Object {
+      "devServerTarget": "my-app:serve:production",
+    },
+  },
+  "executor": "@nrwl/cypress:cypress",
+  "options": Object {
+    "cypressConfig": "apps/my-app-e2e/cypress.json",
+    "devServerTarget": "my-app:serve",
+  },
+}
+`;
+
 exports[`schematic:cypress-project Cypress Project nested should set right path names in \`tsconfig.e2e.json\` 1`] = `
 Object {
   "compilerOptions": Object {

packages/cypress/src/generators/cypress-project/cypress-project.spec.ts

@@ -413,6 +413,21 @@ describe('schematic:cypress-project', () => {
           expect(projectConfig.tags).toEqual([]);
         });
       });
+
+      it('should not throw an error when --project does not have targets', async () => {
+        const projectConf = readProjectConfiguration(tree, 'my-app');
+        delete projectConf.targets;
+
+        updateProjectConfiguration(tree, 'my-app', projectConf);
+        await cypressProjectGenerator(tree, {
+          name: 'my-app-e2e',
+          project: 'my-app',
+          linter: Linter.EsLint,
+        });
+
+        const projectConfig = readProjectConfiguration(tree, 'my-app-e2e');
+        expect(projectConfig.targets['e2e']).toMatchSnapshot();
+      });
     });
 
     describe('--linter', () => {

packages/cypress/src/generators/cypress-project/cypress-project.ts

@@ -13,6 +13,8 @@ import {
   Tree,
   updateJson,
   ProjectConfiguration,
+  stripIndents,
+  logger,
 } from '@nrwl/devkit';
 import { Linter, lintProjectGenerator } from '@nrwl/linter';
 import { runTasksInSerial } from '@nrwl/workspace/src/utilities/run-tasks-in-serial';
@@ -82,8 +84,15 @@ function addProject(tree: Tree, options: CypressProjectSchema) {
     };
   } else if (options.project) {
     const project = readProjectConfiguration(tree, options.project);
+
+    if (!project.targets) {
+      logger.warn(stripIndents`
+      NOTE: Project, "${options.project}", does not have any targets defined and a baseUrl was not provided. Nx will use  
+      "${options.project}:serve" as the devServerTarget. But you may need to define this target within the project, "${options.project}".
+      `);
+    }
     const devServerTarget =
-      project.targets.serve && project.targets.serve.defaultConfiguration
+      project.targets?.serve && project.targets?.serve?.defaultConfiguration
         ? `${options.project}:serve:${project.targets.serve.defaultConfiguration}`
         : `${options.project}:serve`;
     e2eProjectConfig = {