fix(testing): allow removing projects in standalone apps

packages/workspace/src/generators/remove/lib/__fixtures__/jest-project.config.ts

@@ -0,0 +1,15 @@
+/* eslint-disable */
+export default {
+  displayName: 'node-app',
+  preset: './jest.preset.js',
+  testEnvironment: 'node',
+  transform: {
+    '^.+\\.[tj]s$': ['ts-jest', { tsconfig: '<rootDir>/tsconfig.spec.json' }],
+  },
+  moduleFileExtensions: ['ts', 'js', 'html'],
+  coverageDirectory: './coverage/node-app',
+  testMatch: [
+    '<rootDir>/src/**/__tests__/**/*.[jt]s?(x)',
+    '<rootDir>/src/**/*(*.)@(spec|test).[jt]s?(x)',
+  ],
+};

packages/workspace/src/generators/remove/lib/__snapshots__/update-jest-config.spec.ts.snap

@@ -33,6 +33,25 @@ exports[`updateRootJestConfig should delete lib project ref from root jest confi
 "
 `;
 
+exports[`updateRootJestConfig should delete project if root jest config is not a multi-project config 1`] = `
+"/* eslint-disable */
+export default {
+  displayName: 'node-app',
+  preset: './jest.preset.js',
+  testEnvironment: 'node',
+  transform: {
+    '^.+\\\\\\\\.[tj]s$': ['ts-jest', { tsconfig: '<rootDir>/tsconfig.spec.json' }],
+  },
+  moduleFileExtensions: ['ts', 'js', 'html'],
+  coverageDirectory: './coverage/node-app',
+  testMatch: [
+    '<rootDir>/src/**/__tests__/**/*.[jt]s?(x)',
+    '<rootDir>/src/**/*(*.)@(spec|test).[jt]s?(x)',
+  ],
+};
+"
+`;
+
 exports[`updateRootJestConfig should not delete lib project ref from root jest config if there is no project jest config 1`] = `
 "module.exports = {
   projects: [

packages/workspace/src/generators/remove/lib/update-jest-config.spec.ts

@@ -30,7 +30,7 @@ describe('updateRootJestConfig', () => {
 
     tree.write(
       'jest.config.ts',
-      readFileSync(join(__dirname, './test-files/jest.config.ts'), 'utf-8')
+      readFileSync(join(__dirname, './__fixtures__/jest.config.ts'), 'utf-8')
     );
   });
 
@@ -71,4 +71,20 @@ describe('updateRootJestConfig', () => {
 
     expect(rootJestConfig).toMatchSnapshot();
   });
+
+  it('should delete project if root jest config is not a multi-project config', () => {
+    tree.write(
+      'jest.config.ts',
+      readFileSync(
+        join(__dirname, './__fixtures__/jest-project.config.ts'),
+        'utf-8'
+      )
+    );
+
+    updateJestConfig(tree, schema, readProjectConfiguration(tree, 'my-lib'));
+
+    const rootJestConfig = tree.read('jest.config.ts', 'utf-8');
+
+    expect(rootJestConfig).toMatchSnapshot();
+  });
 });

packages/workspace/src/generators/remove/lib/update-jest-config.ts

@@ -21,6 +21,15 @@ function isUsingUtilityFunction(host: Tree) {
   return host.read('jest.config.ts').toString().includes('getJestProjects()');
 }
 
+/**
+ * in a standalone project, the root jest.config.ts is a project config instead
+ * of multi-project config.
+ * in that case we do not need to edit it to remove it
+ **/
+function isMonorepoConfig(tree: Tree) {
+  return tree.read('jest.config.ts', 'utf-8').includes('projects:');
+}
+
 /**
  * Updates the root jest config projects array and removes the project.
  */
@@ -44,7 +53,8 @@ export function updateJestConfig(
   if (
     !tree.exists('jest.config.ts') ||
     !tree.exists(join(projectConfig.root, 'jest.config.ts')) ||
-    isUsingUtilityFunction(tree)
+    isUsingUtilityFunction(tree) ||
+    !isMonorepoConfig(tree)
   ) {
     return;
   }