See https://github.com/eclipse-platform/eclipse.platform.swt/pull/2541#issuecomment-3330540961 It seems that some tests are not included in the test suites. I don't know if this is intentional, but I assume it is an accidental oversight. I am working on a PR that adds all the tests in [org.eclipse.swt.tests.junit](https://github.com/eclipse-platform/eclipse.platform.swt/blob/b7269d920bb431a54b550eeae24f1d5fc56d06d9/tests/org.eclipse.swt.tests/JUnit%20Tests/org/eclipse/swt/tests/junit) (but not subpackages) to the test suite.