Junit-Eclipse No tests found using JUnit 5 or junit4

Issue

Pop up in eclipse saying junit4 tests not found. Not an issue with maven.

Root Cause

Run As-> 'Run Configurations' -> "Test runner:" = junits5 while the tests are written with junit4 api’s.

Resolution

Fixed the issue by right clicking the test and selecting 'Run Configurations' and changing the "Test runner:" selection to 'JUnit 4' as shown here:

The issue can also occur if it’s the other way-round also.