fix(testing): provide more descriptive error when the target project …

…does not have a serve target.

when trying to add cypress to a project that does not contain a serve target 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 error is throw 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/cypress-project.spec.ts

@@ -149,6 +149,22 @@ describe('schematic:cypress-project', () => {
       });
     });
 
+    it('should throw an error if the --project does not have a serve target', async () => {
+      const projectConf = readProjectConfiguration(tree, 'my-app');
+      delete projectConf.targets;
+      updateProjectConfiguration(tree, 'my-app', projectConf);
+
+      await expect(
+        cypressProjectGenerator(tree, {
+          name: 'my-app-e2e',
+          project: 'my-app',
+          linter: Linter.EsLint,
+        })
+      ).rejects.toThrow(
+        'Unable to find a serve target for the provided project, "my-app". Please define a serve target or provide a baseUrl via the --baseUrl flag.'
+      );
+    });
+
     it('should add update `workspace.json` file for a project with a defaultConfiguration', async () => {
       const originalProject = readProjectConfiguration(tree, 'my-app');
       originalProject.targets.serve.defaultConfiguration = 'development';

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

@@ -13,6 +13,7 @@ import {
   Tree,
   updateJson,
   ProjectConfiguration,
+  stripIndents,
 } from '@nrwl/devkit';
 import { Linter, lintProjectGenerator } from '@nrwl/linter';
 import { runTasksInSerial } from '@nrwl/workspace/src/utilities/run-tasks-in-serial';
@@ -82,6 +83,13 @@ function addProject(tree: Tree, options: CypressProjectSchema) {
     };
   } else if (options.project) {
     const project = readProjectConfiguration(tree, options.project);
+
+    if (!project.targets?.serve) {
+      throw new Error(
+        `Unable to find a serve target for the provided project, "${options.project}". Please define a serve target or provide a baseUrl via the --baseUrl flag.`
+      );
+    }
+
     const devServerTarget =
       project.targets.serve && project.targets.serve.defaultConfiguration
         ? `${options.project}:serve:${project.targets.serve.defaultConfiguration}`