TestExecutionListeners are not loaded in native image

[sbrannen]

Overview

At some point during the migration to using Spring AOT for Spring TestContext Framework (TCF) support when executing tests within a native image, the TestExecutionListener implementations stopped being loaded.

Consequently, none of the native image tests for the sample applications actually loads an ApplicationContext. The reason is that a test ApplicationContext is only loaded if a registered TestExecutionListener invokes TestContext#getApplicationContext().

Analysis

TestExecutionListeners are configured via spring.factories and loaded reflectively.

The reason TestExecutionListener implementations are no longer loaded is that the DefaultFactoriesCodeContributor gets used for processing TestExecutionListener types in spring.factories, and that results in support being added to StaticSpringFactories for loading the TestExecutionListeners via SpringFactoriesLoader.loadFactories(). However, the TCF instead uses SpringFactoriesLoader.loadFactoryNames() and instantiates the TestExecutionListeners on its own via reflection.

Deliverables

• Introduce a new FactoriesCodeContributor that handles TestExecutionListener implementations and generates the appropriate native image reflection configuration.