@Test
public void testNumber() {

  source = new NetworkTableEntrySource(eventBus,
      origin -> new MockExceptionWitness(eventBus, origin),
      osf,
      testingNtManager,
      NUMBER_PATH,
      NetworkTableEntrySource.Types.NUMBER);
  assertTrue("Socket could not be updated", source.updateOutputSockets());
  assertEquals("Expected numbers to be equal -- they are not equal",
      TEST_NUMBER, (double) source.getOutputSockets().get(0).getValue().get(), 0.00001);
}