@Test
  public void stopCreatesStopRequestFile() throws Exception {
    // arrange
    FileProcessController controller = new FileProcessController(params, pid);
    assertThat(stopRequestFile).doesNotExist();

    // act
    controller.stop();

    // assert
    assertThat(stopRequestFile).exists();
  }
This is a new test written for GEODE-3413: "Overhaul launcher tests and process tests."
Unfortunately, it hangs so I have filed GEODE-3278. This test should be used to fix and verify
that bug.
geode-core/src/integrationTest/java/org/apache/geode/internal/process/FileProcessControllerIntegrationTest.java