public MetaDataContexts getMetaDataContexts() {
        return metaDataContexts.get();
    }
@Test
    void assertAlterProperties() {
        contextManager.getMetaDataContextManager().getGlobalConfigurationManager().alterProperties(PropertiesBuilder.build(new Property("foo", "foo_value")));
        assertThat(contextManager.getMetaDataContexts().getMetaData().getProps().getProps().getProperty("foo"), is("foo_value"));
    }