SimpleNamingContextBuilder.emptyActivatedContextBuilder();
ConfigurableEnvironment env = new StandardServletEnvironment();
MutablePropertySources sources = env.getPropertySources();
assertThat(sources.precedenceOf(PropertySource.named(StandardServletEnvironment.SERVLET_CONFIG_PROPERTY_SOURCE_NAME)), equalTo(0));
assertThat(sources.precedenceOf(PropertySource.named(StandardServletEnvironment.SERVLET_CONTEXT_PROPERTY_SOURCE_NAME)), equalTo(1));
assertThat(sources.precedenceOf(PropertySource.named(StandardServletEnvironment.JNDI_PROPERTY_SOURCE_NAME)), equalTo(2));
assertThat(sources.precedenceOf(PropertySource.named(StandardEnvironment.SYSTEM_PROPERTIES_PROPERTY_SOURCE_NAME)), equalTo(3));
assertThat(sources.precedenceOf(PropertySource.named(StandardEnvironment.SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME)), equalTo(4));
assertThat(sources.size(), is(5));