fix(tools): prevent create-new-x overwriting old projects (#62621)

tools/challenge-helper-scripts/utils.test.ts

@@ -98,24 +98,29 @@ describe('Challenge utils helper scripts', () => {
   describe('createProject util', () => {
     it('should allow alphanumerical names with trailing whitespace', () => {
       expect(
-        validateBlockName('learn-callbacks-by-creating-a-bookshelf ')
+        validateBlockName('learn-callbacks-by-creating-a-bookshelf ', [])
       ).toBe(true);
     });
     it('should allow alphanumerical names with no trailing whitespace', () => {
-      expect(validateBlockName('learn-callbacks-by-creating-a-bookshelf')).toBe(
-        true
-      );
+      expect(
+        validateBlockName('learn-callbacks-by-creating-a-bookshelf', [])
+      ).toBe(true);
     });
     it('should not allow non-kebab case names', () => {
-      expect(validateBlockName('learnCallbacksBetter')).toBe(
+      expect(validateBlockName('learnCallbacksBetter', [])).toBe(
         'please use alphanumerical characters and kebab case'
       );
     });
     it('should not allow white space names', () => {
-      expect(validateBlockName(' ')).toBe('please enter a dashed name');
+      expect(validateBlockName(' ', [])).toBe('please enter a dashed name');
     });
     it('should not allow empty names', () => {
-      expect(validateBlockName('')).toBe('please enter a dashed name');
+      expect(validateBlockName('', [])).toBe('please enter a dashed name');
+    });
+    it('should not allow names that already exist', () => {
+      expect(validateBlockName('name', ['name'])).toBe(
+        'a block with this name already exists'
+      );
     });
   });