Latest incarnation of the talks does not build, fails with the test

[catull]

The code in master branch does not build the test class.

This is what I get:

[INFO] Running com.graphqljava.tutorial.bookDetails.BookDetailsApplicationTests
13:42:48.574 [main] INFO org.springframework.test.context.support.AnnotationConfigContextLoaderUtils -- Could not detect default configuration classes for test class [com.graphqljava.tutorial.bookDetails.BookDetailsApplicationTests]: BookDetailsApplicationTests does not declare any static, non-private, non-final, nested classes annotated with @Configuration.
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.115 s <<< FAILURE! -- in com.graphqljava.tutorial.bookDetails.BookDetailsApplicationTests
[ERROR] com.graphqljava.tutorial.bookDetails.BookDetailsApplicationTests -- Time elapsed: 0.115 s <<< ERROR!
java.lang.IllegalStateException: Unable to find a @SpringBootConfiguration, you need to use @ContextConfiguration or @SpringBootTest(classes=...) with your test
	at org.springframework.util.Assert.state(Assert.java:76)
	at org.springframework.boot.test.context.SpringBootTestContextBootstrapper.findConfigurationClass(SpringBootTestContextBootstrapper.java:246)
	at org.springframework.boot.test.context.SpringBootTestContextBootstrapper.getOrFindConfigurationClasses(SpringBootTestContextBootstrapper.java:233)
	at org.springframework.boot.test.context.SpringBootTestContextBootstrapper.processMergedContextConfiguration(SpringBootTestContextBootstrapper.java:150)
	at org.springframework.test.context.support.AbstractTestContextBootstrapper.buildMergedContextConfiguration(AbstractTestContextBootstrapper.java:351)
	at org.springframework.test.context.support.AbstractTestContextBootstrapper.buildDefaultMergedContextConfiguration(AbstractTestContextBootstrapper.java:267)
	at org.springframework.test.context.support.AbstractTestContextBootstrapper.buildMergedContextConfiguration(AbstractTestContextBootstrapper.java:215)
	at org.springframework.test.context.support.AbstractTestContextBootstrapper.buildTestContext(AbstractTestContextBootstrapper.java:108)
	at org.springframework.boot.test.context.SpringBootTestContextBootstrapper.buildTestContext(SpringBootTestContextBootstrapper.java:111)
	at org.springframework.test.context.TestContextManager.<init>(TestContextManager.java:142)
	at org.springframework.test.context.TestContextManager.<init>(TestContextManager.java:126)
	at org.springframework.test.context.junit.jupiter.SpringExtension.getTestContextManager(SpringExtension.java:366)
	at org.springframework.test.context.junit.jupiter.SpringExtension.beforeAll(SpringExtension.java:131)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)