Writing code that others can understand without hassle is an art. An important issue in this challenge is proper documentation of the code - not overly extensive, but also not the often encountered zero-documentation-way.

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JUnit offers great possibilities to write good tests with ease. Expressing the intention of tests and test classes with the @DisplayName annotation and structuring them with @Nested is a good practice, causes only minor effort and helps reducing the pain of adapting tests when the code under test has changed.

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