#415 adapt test to issue and manually scan for stages

@componentscan ist not active when using @DataJpaTest. Adding it manually works for now. We should discuss if we want to support that mechanism of Spring Data more deeply.

example-projects/spring-boot/src/test/java/com/tngtech/jgiven/example/springboot/JpaTest.java

@@ -1,16 +1,18 @@
 package com.tngtech.jgiven.example.springboot;
 
 import org.junit.Test;
-import org.springframework.boot.test.autoconfigure.orm.jpa.AutoConfigureTestEntityManager;
-import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.mock.web.MockServletContext;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.context.annotation.ComponentScan;
 
 import com.tngtech.jgiven.annotation.JGivenConfiguration;
+import com.tngtech.jgiven.integration.spring.EnableJGiven;
+import com.tngtech.jgiven.integration.spring.JGivenStage;
 import com.tngtech.jgiven.integration.spring.SimpleSpringRuleScenarioTest;
 
-@SpringBootTest( classes = { MockServletContext.class, HelloTestContext.class } )
+@DataJpaTest
+@ComponentScan(includeFilters = @ComponentScan.Filter(JGivenStage.class))
+@EnableJGiven
 @JGivenConfiguration( HelloJGivenConfiguration.class )
-@AutoConfigureTestEntityManager
 public class JpaTest extends SimpleSpringRuleScenarioTest<JpaStage> {
 
     @Test