What are the advantages to making the non-trivial effort (even with automated tools) to convert a large number of existing JUnit4 tests to JUnit5? All the sources I see show advantages for writing new tests in JUnit5, but I don't see anything that would let me justify the effort to convert our existing JUnit4 tests rather than continuing to have JUnit4 and JUnit5 running side-by-side.
Why convert existing tests from JUnit4 to Junit5?
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As long as your JUnit4 tests do what you want and can be expressed as concisely as necessary I see no pressing reason to migrate existing tests.
In the long run you might want to get rid of the old tests in order to
That said the JUnit platform is explicitly designed to allow JUnit 4 and 5 and other test engines present in the same project.