close #7

PR-Codex overview

Detailed summary

• Added JUnit Jupiter and Mockito dependencies to the project's pom.xml file.
• Added a new dependency for Spring Boot test starter.
• Added a new TestConfig class in the src/test/java/com/example/tasklist/config package.
• Added a new TestConfig class in the src/test/java/com/example/tasklist/service/impl package.
• Added new test methods in the AuthServiceImplTest and TaskServiceImplTest classes.

The following files were skipped due to too many changes: src/test/java/com/example/tasklist/service/impl/TaskServiceImplTest.java, src/test/java/com/example/tasklist/service/impl/UserServiceImplTest.java

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