How to enable Spring's auto-configuration report in tests?
<p>I just found out that Spring has a debug mode, which gives insights on the auto-configuration. For a server, it can be enabled by passing <code>--debug</code> as an application parameter.</p>

<p><strong>Is there a way to enable the debug mode also for tests (executed with the <code>SpringJUnit4ClassRunner</code>)?</strong></p>

<hr>

<p>If the auto-configuration report is working, it should print some output like this:</p>

<pre><code>=========================
AUTO-CONFIGURATION REPORT
=========================


Positive matches:
-----------------

   ConfigServiceBootstrapConfiguration#configServicePropertySource matched
      - matched (OnPropertyCondition)

   ConfigurationPropertiesRebinderAutoConfiguration matched
      - @ConditionalOnBean (types: org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor; SearchStrategy: all) found the following [org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor] (OnBeanCondition)

   ConfigurationPropertiesRebinderAutoConfiguration#configurationPropertiesBeans matched
      - @ConditionalOnMissingBean (types: org.springframework.cloud.context.properties.ConfigurationPropertiesBeans; SearchStrategy: current) found no beans (OnBeanCondition)

   ConfigurationPropertiesRebinderAutoConfiguration#configurationPropertiesRebinder matched
      - @ConditionalOnMissingBean (types: org.springframework.cloud.context.properties.ConfigurationPropertiesRebinder; SearchStrategy: current) found no beans (OnBeanCondition)

   EncryptionBootstrapConfiguration matched
      - @ConditionalOnClass classes found: org.springframework.security.crypto.encrypt.TextEncryptor (OnClassCondition)

   PropertyPlaceholderAutoConfiguration#propertySourcesPlaceholderConfigurer matched
      - @ConditionalOnMissingBean (types: org.springframework.context.support.PropertySourcesPlaceholderConfigurer; SearchStrategy: current) found no beans (OnBeanCondition)


Negative matches:
-----------------

   ConfigServiceBootstrapConfiguration.RetryConfiguration did not match
      - required @ConditionalOnClass classes not found: org.springframework.retry.annotation.Retryable,org.aspectj.lang.annotation.Aspect (OnClassCondition)

   DiscoveryClientConfigServiceBootstrapConfiguration did not match
      - @ConditionalOnProperty missing required properties spring.cloud.config.discovery.enabled (OnPropertyCondition)

   EncryptionBootstrapConfiguration.RsaEncryptionConfiguration did not match
      - @ConditionalOnClass classes found: org.springframework.security.rsa.crypto.RsaSecretEncryptor (OnClassCondition)
      - Keystore nor key found in Environment (EncryptionBootstrapConfiguration.KeyCondition)

   EncryptionBootstrapConfiguration.VanillaEncryptionConfiguration did not match
      - required @ConditionalOnMissing classes found: org.springframework.security.rsa.crypto.RsaSecretEncryptor (OnClassCondition)

   EurekaDiscoveryClientConfigServiceBootstrapConfiguration did not match
      - @ConditionalOnClass classes found: org.springframework.cloud.config.client.ConfigServicePropertySourceLocator (OnClassCondition)
      - @ConditionalOnProperty missing required properties spring.cloud.config.discovery.enabled (OnPropertyCondition)


Exclusions:
-----------

    None


Unconditional classes:
----------------------

    None
</code></pre>