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The process for carrying out unit testing in decorators within NestJS includes the following steps:

1. Set up your testing environment: You will need to install the necessary dependencies and create a testing module to import the decorators you want to test.

2. Create a test file: Create a file with the .spec.ts extension and import the necessary modules from NestJS and your application.

3. Use @nest/microservices/testing library: Since the decorator tests may require mocks, use the @nest/microservices/testing library, which provides a convenient way to do this.

4. Create a test suite: Use the describe function to create a test suite for your decorator.

5. Write test cases: Use the it function to write specific test cases for your decorator.

6. Use TestBed.inject method: Use the TestBed.inject method to access the decorator and test its functionality.

7. Assert the results: Use assertion functions from a test framework like Jest or Jasmine to ensure that the decorator is working as expected.

8. Run the tests: Run the tests using a test runner like Jest or Karma to see if the tests pass.

9. Refactor and retest as necessary: If the tests fail, make changes to your decorator and re-run the tests until all the tests pass.