You wrote a test with @DataJpaTest but it fails with a BeanCreationException related to missing DataSource. What is the most likely cause?

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Spring Boot - Testing Spring Boot Applications

You wrote a test with @DataJpaTest but it fails with a BeanCreationException related to missing DataSource. What is the most likely cause?

AYou did not annotate the test class with @SpringBootTest

BYou forgot to include an in-memory database dependency like H2

CYou used @DataJpaTest on a non-repository class

DYou did not add @Autowired to the repository field

Step-by-Step Solution

Solution:

Step 1: Understand the error cause
BeanCreationException for DataSource usually means Spring cannot find a database connection.
Step 2: Check dependencies for @DataJpaTest
@DataJpaTest uses an in-memory database by default, but you must include a dependency like H2 in your project.
Final Answer:
You forgot to include an in-memory database dependency like H2 -> Option B
Quick Check:
Missing DB dependency causes DataSource error [OK]

Quick Trick: Add H2 dependency for @DataJpaTest to create DataSource [OK]

Common Mistakes:

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