org.springframework.core.env.MutablePropertySources#addLast ( )源码实例Demo

@Test
@SuppressWarnings("serial")
public void explicitPropertySourcesExcludesLocalProperties() {
	DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
	bf.registerBeanDefinition("testBean",
			genericBeanDefinition(TestBean.class)
				.addPropertyValue("name", "${my.name}")
				.getBeanDefinition());

	MutablePropertySources propertySources = new MutablePropertySources();
	propertySources.addLast(new MockPropertySource());

	PropertySourcesPlaceholderConfigurer ppc = new PropertySourcesPlaceholderConfigurer();
	ppc.setPropertySources(propertySources);
	ppc.setProperties(new Properties() {{
		put("my.name", "local");
	}});
	ppc.setIgnoreUnresolvablePlaceholders(true);
	ppc.postProcessBeanFactory(bf);
	assertThat(bf.getBean(TestBean.class).getName(), equalTo("${my.name}"));
}
 

@Test
public void explicitPropertySourcesExcludesEnvironment() {
	DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
	bf.registerBeanDefinition("testBean",
			genericBeanDefinition(TestBean.class)
				.addPropertyValue("name", "${my.name}")
				.getBeanDefinition());

	MutablePropertySources propertySources = new MutablePropertySources();
	propertySources.addLast(new MockPropertySource());

	PropertySourcesPlaceholderConfigurer pc = new PropertySourcesPlaceholderConfigurer();
	pc.setPropertySources(propertySources);
	pc.setEnvironment(new MockEnvironment().withProperty("my.name", "env"));
	pc.setIgnoreUnresolvablePlaceholders(true);
	pc.postProcessBeanFactory(bf);
	assertThat(bf.getBean(TestBean.class).getName(), equalTo("${my.name}"));
	assertEquals(pc.getAppliedPropertySources().iterator().next(), propertySources.iterator().next());
}
 

@Test
@SuppressWarnings("serial")
public void explicitPropertySourcesExcludesLocalProperties() {
	DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
	bf.registerBeanDefinition("testBean",
			genericBeanDefinition(TestBean.class)
				.addPropertyValue("name", "${my.name}")
				.getBeanDefinition());

	MutablePropertySources propertySources = new MutablePropertySources();
	propertySources.addLast(new MockPropertySource());

	PropertySourcesPlaceholderConfigurer ppc = new PropertySourcesPlaceholderConfigurer();
	ppc.setPropertySources(propertySources);
	ppc.setProperties(new Properties() {{
		put("my.name", "local");
	}});
	ppc.setIgnoreUnresolvablePlaceholders(true);
	ppc.postProcessBeanFactory(bf);
	assertThat(bf.getBean(TestBean.class).getName(), equalTo("${my.name}"));
}
 

/**
 * Don't use ConfigurableEnvironment.merge() in case there are clashes with
 * property source names
 * 
 * @param input
 * @return
 */
private StandardEnvironment copyEnvironment(ConfigurableEnvironment input) {
	StandardEnvironment environment = new StandardEnvironment();
	MutablePropertySources capturedPropertySources = environment.getPropertySources();

	// Only copy the default property source(s) and the profiles over from
	// the main environment (everything else should be pristine, just like
	// it was on startup).
	for (String name : DEFAULT_PROPERTY_SOURCES) {
		if (input.getPropertySources().contains(name)) {
			if (capturedPropertySources.contains(name)) {
				capturedPropertySources.replace(name, input.getPropertySources().get(name));
			} else {
				capturedPropertySources.addLast(input.getPropertySources().get(name));
			}
		}
	}
	environment.setActiveProfiles(input.getActiveProfiles());
	environment.setDefaultProfiles(input.getDefaultProfiles());

	Map<String, Object> map = new HashMap<String, Object>();
	map.put("spring.jmx.enabled", false);
	map.put("spring.main.sources", "");
	capturedPropertySources.addFirst(new MapPropertySource(SCM_REFRESH_PROPERTY_SOURCE, map));
	return environment;
}
 

private void addPropertySource(PropertySource<?> propertySource) {
	String name = propertySource.getName();
	MutablePropertySources propertySources = ((ConfigurableEnvironment) this.environment).getPropertySources();

	if (this.propertySourceNames.contains(name)) {
		// We've already added a version, we need to extend it
		PropertySource<?> existing = propertySources.get(name);
		if (existing != null) {
			PropertySource<?> newSource = (propertySource instanceof ResourcePropertySource ?
					((ResourcePropertySource) propertySource).withResourceName() : propertySource);
			if (existing instanceof CompositePropertySource) {
				((CompositePropertySource) existing).addFirstPropertySource(newSource);
			}
			else {
				if (existing instanceof ResourcePropertySource) {
					existing = ((ResourcePropertySource) existing).withResourceName();
				}
				CompositePropertySource composite = new CompositePropertySource(name);
				composite.addPropertySource(newSource);
				composite.addPropertySource(existing);
				propertySources.replace(name, composite);
			}
			return;
		}
	}

	if (this.propertySourceNames.isEmpty()) {
		propertySources.addLast(propertySource);
	}
	else {
		String firstProcessed = this.propertySourceNames.get(this.propertySourceNames.size() - 1);
		propertySources.addBefore(firstProcessed, propertySource);
	}
	this.propertySourceNames.add(name);
}
 

@Bean
public static PropertySourcesPlaceholderConfigurer placeHolderConfigurer() {
    PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
    configurer.setIgnoreResourceNotFound(true);
    configurer.setIgnoreUnresolvablePlaceholders(true);
    MutablePropertySources propertySources = new MutablePropertySources();
    propertySources.addLast(new MockPropertySource());
    configurer.setPropertySources(propertySources);
    return configurer;
}
 

/**
 * {@inheritDoc}
 * 
 * Initializes the InMemoryUserDetailsManager with the following users:
 * 
 * * user/password, role USER
 * * admin/password, role ADMIN
 * 
 * Neither the method {@link AuthenticationManagerBuilder#inMemoryAuthentication()} 
 * nor {@link AuthenticationManagerBuilder#apply(SecurityConfigurerAdapter)} 
 * are used to avoid to override the default UserDetailsService. Note that Springlets 
 * configure the JpaUserDetailsService as the default one.
 * 
 * Use the passwords as given, they aren't encrypted.
 */
@Override
public void init(AuthenticationManagerBuilder auth) throws Exception {

  // clear credentials after success authentication
  auth.eraseCredentials(securityProperties.getAuth().getInMemory().isEraseCredentials());

  // Configure a in memory AuthenticationProvider with two users
  InMemoryUserDetailsManagerConfigurer<AuthenticationManagerBuilder> inMemAuthProvConfigurer =
      new InMemoryUserDetailsManagerConfigurer<AuthenticationManagerBuilder>();

  String userPassw = UUID.randomUUID().toString();
  inMemAuthProvConfigurer.withUser("user").password(userPassw).roles("USER");

  String adminPassw = UUID.randomUUID().toString();
  inMemAuthProvConfigurer.withUser("admin").password(adminPassw).roles("USER",
      "ADMIN");

  LOG.info("\n\nDefault security users [USERNAME : PASSWORD : ROLES]:\n" +
           "\n  [user  : {} : ROLE_USER]\n" +
           "\n  [admin : {} : ROLE_USER, ROLE_ADMIN]\n", userPassw , adminPassw);

  // Add users credentials to Environment for dev purposes

  Map<String, Object> map = new HashMap<String, Object>();
  map.put("springlets.security.auth.in-memory.enabled", true);
  map.put("springlets.security.auth.in-memory.user.name", "user");
  map.put("springlets.security.auth.in-memory.user.password", userPassw);

  MutablePropertySources sources = this.applicationContext.getEnvironment().getPropertySources();
  sources.addLast(new MapPropertySource("springlets", map));

  inMemAuthProvConfigurer.configure(auth);
}
 

private void addOrReplace(MutablePropertySources environment,
		PropertySource<?> result) {
	if (environment.contains(result.getName())) {
		environment.replace(result.getName(), result);
	}
	else {
		environment.addLast(result);
	}
}
 

@Bean
public static PropertySourcesPlaceholderConfigurer placeHolderConfigurer() {
    PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
    configurer.setIgnoreResourceNotFound(true);
    configurer.setIgnoreUnresolvablePlaceholders(true);
    MutablePropertySources propertySources = new MutablePropertySources();
    MockPropertySource source = new MockPropertySource()
        .withProperty("rabbitmq.port", "invalid");
    propertySources.addLast(source);
    configurer.setPropertySources(propertySources);
    return configurer;
}
 

public static PropertySources create(ConfigGroup... configGroups) {
	final MutablePropertySources sources = new MutablePropertySources();
	for (ConfigGroup configGroup : configGroups) {
		if (configGroup.isEnumerable()) {
			sources.addLast(new ConfigGroupEnumerableResource(configGroup));
		} else {
			sources.addLast(new ConfigGroupResource(configGroup));
		}
	}
	return sources;
}
 

@Bean
public PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer(
        final ConfigurableEnvironment env)
{
    final PropertySourcesPlaceholderConfigurer configurer =
            new PropertySourcesPlaceholderConfigurer();
    // https://jira.spring.io/browse/SPR-9631 may simplify this in
    // future
    final MutablePropertySources sources = new MutablePropertySources();
    sources.addLast(createConfigPropertySource());
    configurer.setPropertySources(sources);
    configurer.setEnvironment(env);
    return configurer;
}
 

@Override
public void postProcessBeanFactory(final ConfigurableListableBeanFactory beanFactory) throws BeansException {
    final Properties propertiesSource = new Properties();

    final GetParametersByPathRequest.Builder requestBuilder = GetParametersByPathRequest
            .builder()
            .path(properties.getPath())
            .recursive(true)
            .withDecryption(true);

    final GetParametersByPathResponse firstPage = ssmClient.getParametersByPath(requestBuilder.build());
    addParametersToPropertiesSource(propertiesSource, firstPage.parameters());
    String nextToken = firstPage.nextToken();

    while (!isNullOrEmpty(nextToken)) {
        final GetParametersByPathResponse nextPage = ssmClient.getParametersByPath(requestBuilder
                .nextToken(nextToken)
                .build()
        );
        addParametersToPropertiesSource(propertiesSource, nextPage.parameters());
        nextToken = nextPage.nextToken();
    }

    final ConfigurableEnvironment env = beanFactory.getBean(ConfigurableEnvironment.class);
    final MutablePropertySources propertySources = env.getPropertySources();
    if (properties.isAddWithLowestPrecedence()) {
        propertySources.addLast(new PropertiesPropertySource(PARAMETER_STORE_PROPERTY_SOURCE, propertiesSource));
    } else {
        propertySources.addFirst(new PropertiesPropertySource(PARAMETER_STORE_PROPERTY_SOURCE, propertiesSource));
    }
}
 

@Bean(name = BASE_PACKAGES_PROPERTY_RESOLVER_BEAN_NAME)
public PropertyResolver dubboScanBasePackagesPropertyResolver(ConfigurableEnvironment environment) {
    ConfigurableEnvironment propertyResolver = new AbstractEnvironment() {
        @Override
        protected void customizePropertySources(MutablePropertySources propertySources) {
            Map<String, Object> dubboScanProperties = getSubProperties(environment.getPropertySources(), DUBBO_SCAN_PREFIX);
            propertySources.addLast(new MapPropertySource("dubboScanProperties", dubboScanProperties));
        }
    };
    ConfigurationPropertySources.attach(propertyResolver);
    return new DelegatingPropertyResolver(propertyResolver);
}
 

private Map<String, Object> resolveSubProperties(boolean multiple, String beanName,
                                                 Map<String, Object> configurationProperties) {
    if (!multiple) {
        return configurationProperties;
    }

    MutablePropertySources propertySources = new MutablePropertySources();

    propertySources.addLast(new MapPropertySource("_", configurationProperties));

    return getSubProperties(propertySources, environment, normalizePrefix(beanName));
}
 

@Test
public void configuresGemFirePropertiesCorrectlyAndSafely() {

	Map<String, Object> gemfirePropertiesOne = MapBuilder.<String, Object>newMapBuilder()
		.put("gemfire.cache-xml-file", "/path/to/cache.xml")
		.put("gemfire.name", "TestName")
		.put("gemfire.non-existing-property", "TEST")
		.put("geode.enforce-unique-host", "true")
		.put("enable-time-statistics", "true")
		.put("junk.test-property", "MOCK")
		.build();

	Map<String, Object> gemfirePropertiesTwo = MapBuilder.<String, Object>newMapBuilder()
		.put("gemfire.groups", "MockGroup,TestGroup")
		.put("gemfire.mcast-port", " ")
		.put("gemfire.remote-locators", "hellbox[666]")
		.put("mock-property", "MOCK")
		.put("  ", "BLANK")
		.put("", "EMPTY")
		.build();

	CacheFactoryBean mockCacheFactoryBean = mock(CacheFactoryBean.class);

	ConfigurableEnvironment mockEnvironment = mock(ConfigurableEnvironment.class);

	EnumerablePropertySource<?> emptyEnumerablePropertySource = mock(EnumerablePropertySource.class);

	Logger mockLogger = mock(Logger.class);

	MutablePropertySources propertySources = new MutablePropertySources();

	PropertySource<?> nonEnumerablePropertySource = mock(PropertySource.class);

	propertySources.addFirst(new MapPropertySource("gemfirePropertiesOne", gemfirePropertiesOne));
	propertySources.addLast(new MapPropertySource("gemfirePropertiesTwo", gemfirePropertiesTwo));
	propertySources.addLast(emptyEnumerablePropertySource);
	propertySources.addLast(nonEnumerablePropertySource);

	when(mockEnvironment.getPropertySources()).thenReturn(propertySources);

	Properties actualGemFireProperties = new Properties();

	actualGemFireProperties.setProperty("remote-locators", "skullbox[12345]");

	doAnswer(invocation -> actualGemFireProperties).when(mockCacheFactoryBean).getProperties();
	doAnswer(invocation -> {

		Properties gemfireProperties = invocation.getArgument(0);

		actualGemFireProperties.putAll(gemfireProperties);

		return null;

	}).when(mockCacheFactoryBean).setProperties(any(Properties.class));

	doReturn(mockLogger).when(this.configuration).getLogger();

	doAnswer(invocation -> {

		String propertyName = invocation.getArgument(0);

		return gemfirePropertiesOne.getOrDefault(propertyName,
			gemfirePropertiesTwo.getOrDefault(propertyName, null));

	}).when(mockEnvironment).getProperty(anyString());

	this.configuration.configureGemFireProperties(mockEnvironment, mockCacheFactoryBean);

	assertThat(actualGemFireProperties).isNotNull();
	assertThat(actualGemFireProperties).hasSize(4);
	assertThat(actualGemFireProperties).containsKeys("cache-xml-file", "name", "groups");
	assertThat(actualGemFireProperties.getProperty("cache-xml-file")).isEqualTo("/path/to/cache.xml");
	assertThat(actualGemFireProperties.getProperty("name")).isEqualTo("TestName");
	assertThat(actualGemFireProperties.getProperty("groups")).isEqualTo("MockGroup,TestGroup");
	assertThat(actualGemFireProperties.getProperty("remote-locators")).isEqualTo("skullbox[12345]");

	verify(mockLogger, times(1))
		.warn(eq("[gemfire.non-existing-property] is not a valid Apache Geode property"));
	verify(mockLogger, times(1))
		.warn(eq("Apache Geode Property [{}] was not set"), eq("mcast-port"));
}
 

@Test
public void getConfiguredConnectionEndpointsIsCorrect() {

	ConfigurableEnvironment mockEnvironment = mock(ConfigurableEnvironment.class);

	MutablePropertySources propertySources = new MutablePropertySources();

	Properties locatorProperties = new Properties();
	Properties serverProperties = new Properties();

	locatorProperties.setProperty("spring.data.gemfire.pool.locators", "boombox[1234], cardboardbox[5678], mailbox[9012]");
	locatorProperties.setProperty("spring.data.gemfire.pool.car.locators", "skullbox[11235]");
	locatorProperties.setProperty("spring.data.gemfire.pool.other-property", "junk");
	serverProperties.setProperty("spring.data.gemfire.pool.servers", "mars[41414]");
	serverProperties.setProperty("spring.data.gemfire.pool.swimming.servers", "jupiter[42424], saturn[43434]");
	serverProperties.setProperty("spring.data.gemfire.pool.other-property", "junk");

	propertySources.addLast(new PropertiesPropertySource("LocatorPoolProperties", locatorProperties));
	propertySources.addFirst(new PropertiesPropertySource("ServerPoolProperties", serverProperties));

	when(mockEnvironment.getPropertySources()).thenReturn(propertySources);

	when(mockEnvironment.getProperty(anyString())).thenAnswer(invocation -> {

		String propertyName = invocation.getArgument(0);

		return locatorProperties.getProperty(propertyName, serverProperties.getProperty(propertyName));
	});

	List<ConnectionEndpoint> connectionEndpoints = this.condition.getConfiguredConnectionEndpoints(mockEnvironment);

	List<String> connectionEndpointStrings = connectionEndpoints.stream()
		.map(ConnectionEndpoint::toString)
		.collect(Collectors.toList());

	assertThat(connectionEndpoints).isNotNull();
	assertThat(connectionEndpoints).hasSize(7);
	assertThat(connectionEndpointStrings)
		.containsExactlyInAnyOrder("mars[41414]", "jupiter[42424]", "saturn[43434]", "boombox[1234]",
			"cardboardbox[5678]", "mailbox[9012]", "skullbox[11235]");

	verify(mockEnvironment, times(1)).getPropertySources();
	verify(mockEnvironment, times(4)).getProperty(anyString());
}
 

/**
 * Customize the set of property sources with those contributed by superclasses as
 * well as those appropriate for standard servlet-based environments:
 * <ul>
 * <li>{@value #SERVLET_CONFIG_PROPERTY_SOURCE_NAME}
 * <li>{@value #SERVLET_CONTEXT_PROPERTY_SOURCE_NAME}
 * <li>{@value #JNDI_PROPERTY_SOURCE_NAME}
 * </ul>
 * <p>Properties present in {@value #SERVLET_CONFIG_PROPERTY_SOURCE_NAME} will
 * take precedence over those in {@value #SERVLET_CONTEXT_PROPERTY_SOURCE_NAME}, and
 * properties found in either of the above take precedence over those found in
 * {@value #JNDI_PROPERTY_SOURCE_NAME}.
 * <p>Properties in any of the above will take precedence over system properties and
 * environment variables contributed by the {@link StandardEnvironment} superclass.
 * <p>The {@code Servlet}-related property sources are added as
 * {@link StubPropertySource stubs} at this stage, and will be
 * {@linkplain #initPropertySources(ServletContext, ServletConfig) fully initialized}
 * once the actual {@link ServletContext} object becomes available.
 * @see StandardEnvironment#customizePropertySources
 * @see org.springframework.core.env.AbstractEnvironment#customizePropertySources
 * @see ServletConfigPropertySource
 * @see ServletContextPropertySource
 * @see org.springframework.jndi.JndiPropertySource
 * @see org.springframework.context.support.AbstractApplicationContext#initPropertySources
 * @see #initPropertySources(ServletContext, ServletConfig)
 */
@Override
protected void customizePropertySources(MutablePropertySources propertySources) {
	propertySources.addLast(new StubPropertySource(SERVLET_CONFIG_PROPERTY_SOURCE_NAME));
	propertySources.addLast(new StubPropertySource(SERVLET_CONTEXT_PROPERTY_SOURCE_NAME));
	if (JndiLocatorDelegate.isDefaultJndiEnvironmentAvailable()) {
		propertySources.addLast(new JndiPropertySource(JNDI_PROPERTY_SOURCE_NAME));
	}
	super.customizePropertySources(propertySources);
}
 

/**
 * Customize the set of property sources with those contributed by superclasses as
 * well as those appropriate for standard servlet-based environments:
 * <ul>
 * <li>{@value #SERVLET_CONFIG_PROPERTY_SOURCE_NAME}
 * <li>{@value #SERVLET_CONTEXT_PROPERTY_SOURCE_NAME}
 * <li>{@value #JNDI_PROPERTY_SOURCE_NAME}
 * </ul>
 * <p>Properties present in {@value #SERVLET_CONFIG_PROPERTY_SOURCE_NAME} will
 * take precedence over those in {@value #SERVLET_CONTEXT_PROPERTY_SOURCE_NAME}, and
 * properties found in either of the above take precedence over those found in
 * {@value #JNDI_PROPERTY_SOURCE_NAME}.
 * <p>Properties in any of the above will take precedence over system properties and
 * environment variables contributed by the {@link StandardEnvironment} superclass.
 * <p>The {@code Servlet}-related property sources are added as
 * {@link StubPropertySource stubs} at this stage, and will be
 * {@linkplain #initPropertySources(ServletContext, ServletConfig) fully initialized}
 * once the actual {@link ServletContext} object becomes available.
 * @see StandardEnvironment#customizePropertySources
 * @see org.springframework.core.env.AbstractEnvironment#customizePropertySources
 * @see ServletConfigPropertySource
 * @see ServletContextPropertySource
 * @see org.springframework.jndi.JndiPropertySource
 * @see org.springframework.context.support.AbstractApplicationContext#initPropertySources
 * @see #initPropertySources(ServletContext, ServletConfig)
 */
@Override
protected void customizePropertySources(MutablePropertySources propertySources) {
	propertySources.addLast(new StubPropertySource(SERVLET_CONFIG_PROPERTY_SOURCE_NAME));
	propertySources.addLast(new StubPropertySource(SERVLET_CONTEXT_PROPERTY_SOURCE_NAME));
	if (JndiLocatorDelegate.isDefaultJndiEnvironmentAvailable()) {
		propertySources.addLast(new JndiPropertySource(JNDI_PROPERTY_SOURCE_NAME));
	}
	super.customizePropertySources(propertySources);
}
 

/**
 * Customize the set of property sources with those contributed by superclasses as
 * well as those appropriate for standard portlet-based environments:
 * <ul>
 * <li>{@value #PORTLET_CONFIG_PROPERTY_SOURCE_NAME}
 * <li>{@value #PORTLET_CONTEXT_PROPERTY_SOURCE_NAME}
 * <li>{@linkplain StandardServletEnvironment#SERVLET_CONTEXT_PROPERTY_SOURCE_NAME "servletContextInitParams"}
 * <li>{@linkplain StandardServletEnvironment#JNDI_PROPERTY_SOURCE_NAME "jndiProperties"}
 * </ul>
 * <p>Properties present in {@value #PORTLET_CONFIG_PROPERTY_SOURCE_NAME} will
 * take precedence over those in {@value #PORTLET_CONTEXT_PROPERTY_SOURCE_NAME},
 * which takes precedence over those in {@linkplain
 * StandardServletEnvironment#SERVLET_CONTEXT_PROPERTY_SOURCE_NAME "servletContextInitParams"}
 * and so on.
 * <p>Properties in any of the above will take precedence over system properties and
 * environment variables contributed by the {@link StandardEnvironment} superclass.
 * <p>The property sources are added as stubs for now, and will be
 * {@linkplain PortletApplicationContextUtils#initPortletPropertySources fully
 * initialized} once the actual {@link PortletConfig}, {@link PortletContext}, and
 * {@link ServletContext} objects are available.
 * @see StandardEnvironment#customizePropertySources
 * @see org.springframework.core.env.AbstractEnvironment#customizePropertySources
 * @see PortletConfigPropertySource
 * @see PortletContextPropertySource
 * @see PortletApplicationContextUtils#initPortletPropertySources
 */
@Override
protected void customizePropertySources(MutablePropertySources propertySources) {
	propertySources.addLast(new StubPropertySource(PORTLET_CONFIG_PROPERTY_SOURCE_NAME));
	propertySources.addLast(new StubPropertySource(PORTLET_CONTEXT_PROPERTY_SOURCE_NAME));
	propertySources.addLast(new StubPropertySource(StandardServletEnvironment.SERVLET_CONTEXT_PROPERTY_SOURCE_NAME));
	if (JndiLocatorDelegate.isDefaultJndiEnvironmentAvailable()) {
		propertySources.addLast(new JndiPropertySource(StandardServletEnvironment.JNDI_PROPERTY_SOURCE_NAME));
	}
	super.customizePropertySources(propertySources);
}
 

@Test
public void testGetSubProperties() {

    ConfigurableEnvironment environment = new AbstractEnvironment() {
    };

    MutablePropertySources propertySources = environment.getPropertySources();

    Map<String, Object> source = new HashMap<String, Object>();
    Map<String, Object> source2 = new HashMap<String, Object>();

    MapPropertySource propertySource = new MapPropertySource("propertySource", source);
    MapPropertySource propertySource2 = new MapPropertySource("propertySource2", source2);

    propertySources.addLast(propertySource);
    propertySources.addLast(propertySource2);

    Map<String, Object> result = getSubProperties(propertySources, "user");

    assertEquals(Collections.emptyMap(), result);

    source.put("age", "31");
    source.put("user.name", "Mercy");
    source.put("user.age", "${age}");

    source2.put("user.name", "mercyblitz");
    source2.put("user.age", "32");

    Map<String, Object> expected = new HashMap<String, Object>();
    expected.put("name", "Mercy");
    expected.put("age", "31");

    assertEquals(expected, getSubProperties((Iterable) propertySources, "user"));

    assertEquals(expected, getSubProperties(environment, "user"));

    assertEquals(expected, getSubProperties(propertySources, "user"));

    assertEquals(expected, getSubProperties(propertySources, environment, "user"));

    result = getSubProperties(propertySources, "");

    assertEquals(Collections.emptyMap(), result);

    result = getSubProperties(propertySources, "no-exists");

    assertEquals(Collections.emptyMap(), result);

}