### Question:
ConfigurationUtil { public static long getLong(Configuration configuration, String label) { long value = configuration.getLong(label, -1); assert value >= 0 : "Couldn't find " + label; return value; } private  ConfigurationUtil(); static void publish(Configuration configuration, String label, T value); static int getInt(Configuration configuration, String label); static long getLong(Configuration configuration, String label); static Class<? extends InputFormat> getStrategy(Configuration conf, S3MapReduceCpOptions options);  }### Answer:
@Test(expected = AssertionError.class) public void getUnknownLongProperty() { ConfigurationUtil.getLong(config, "a.b.c"); }
@Test public void getLongProperty() { config.set("a.b.c", "1234567890"); assertThat(ConfigurationUtil.getLong(config, "a.b.c"), is(1234567890L)); }