@Test public void filterUnknownKey() { ConfigFilter configFilter = new EnvironmentVariableConfigFilter(); assertNull(configFilter.filter("unknown")); }
@Override public String filter(String key) { return System.getenv(key); }
EnvironmentVariableConfigFilter extends AbstractConfigFilter { @Override public String filter(String key) { return System.getenv(key); } }
EnvironmentVariableConfigFilter extends AbstractConfigFilter { @Override public String filter(String key) { return System.getenv(key); }  }
EnvironmentVariableConfigFilter extends AbstractConfigFilter { @Override public String filter(String key) { return System.getenv(key); }  @Override String filter(String key); @Override void initializeWithConfiguration(Map<String, String> configuration); }
EnvironmentVariableConfigFilter extends AbstractConfigFilter { @Override public String filter(String key) { return System.getenv(key); }  @Override String filter(String key); @Override void initializeWithConfiguration(Map<String, String> configuration);  }