There is a way you can do this using the coder.runTest function. See the steps below. This answer uses the same file names used in this example: Unit Test Generated Code with MATLAB Coder
1) Write a MATLAB script called "run_unit_tests.m" that you will use to run your tests
2) Inside "run_unit_tests.m", call the runtests function from the MATLAB Unit-Test Framework and use the "ProcedureName" Name-Value pair to specify which test you want to run. For instance, you could write:
>> runtests('TestAddOne','ProcedureName', 'reallyAddsOne')
See this link for more information on runtests: Run set of tests - MATLAB runtests
3) Now that you have your script setup, you can pass the name of the script to the coder.runTest function:
>> coder.runTest('run_unit_tests', ['addOne_sil.', mexext])
The coder.runTest function will run whatever code you write in "run_unit_tests.m", and so you can control exactly how the tests run.
