### Question:
ConfigurationUtils { public static String formatEnvironmentVariable(String key) { return key.toUpperCase().replaceAll("\\.", "_"); } private  ConfigurationUtils(); static String formatEnvironmentVariable(String key); static String tryGetGlobalProperty(String key, String defaultValue); static String tryGetGlobalProperty(String key); static Integer tryGetGlobalIntegerProperty(String key, Integer defaultValue); static Integer tryGetGlobalIntegerProperty(String key);  }### Answer:
@Test public void testEnvVarFormat() { assertThat(ConfigurationUtils.formatEnvironmentVariable("custom.aerogear.apns.push.host")) .isEqualTo("CUSTOM_AEROGEAR_APNS_PUSH_HOST"); }