@Before
  public void setUp() throws Exception {
    testDir = temporaryFolder.getRoot();
    assertThat(testDir).exists();
  }
Integration tests for {@link GemFireStatSampler}.

@since GemFire 7.0
geode-core/src/integrationTest/java/org/apache/geode/internal/statistics/GemFireStatSamplerIntegrationTest.java