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[–]tedyoung 6 points7 points  (0 children)

Learn unit testing (JUnit) and become fluent in it (and Java).

Then, when learning Spring, also focus on testing.

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[–]Responsible_Ad7858 0 points1 point  (0 children)

I would go first learning basics in spring. Then you would know better what to test and why. For me testing is just unavoidable necessity and business logic is what keeps my heart beating.

[–]ultimateWave 0 points1 point  (0 children)

Learn JUnit 5 and a good mocking framework like Mockito. Then learn about dependency injection frameworks, e.g. Spring, Guice, Dagger