lib/testFramework.jar lacks package directory entries in the build IC-213.3714.440. This can be seen for example by executing `jar tvf lib/testFramework.jar`. The jar content listing of the release version (tried with 2021.2) results in package directories in stdout while there are just .class files in case of IC-213.3714.440.
This makes it impossible to use testFramework.jar by Gradle :test task if a test case refers to a superclass in testFramework.jar. Gradle takes advantage of directory entries (see https://github.com/gradle/gradle/blob/master/subprojects/testing-jvm/src/main/java/org/gradle/api/internal/tasks/testing/detection/JarFilePackageLister.java) when it builds a mapping from package names to library files. As a result, the error below will appear and the corresponding test cases will not be resolved.
[DEBUG] [org.gradle.api.internal.tasks.testing.detection.AbstractTestFrameworkDetector] test-class-scan : failed to scan parent class com/intellij/testFramework/HeavyPlatformTestCase, could not find the class file