code: protected EmbeddedServer<?> instantiateServer(Class<?> testClass, AbstractConfiguration configuration) {
  		return configuration == null ? Servers.instantiate(testClass) : Servers.instantiate(configuration);
  	}
docs: Instantiate server (implementation to use is automatically detected using the Service Provider
  API).
  
  @param testClass The test class instance.
  @param configuration The embedded server configuration to use.
  @return The embedded server.