The test failed in case no jdk.zipfs module present in custom JRE or in case usage of --limi-modules options.

Exception seen:
config JFSTester.initialize(): success
test JFSTester.testWalk(): failure
java.nio.file.ProviderNotFoundException: Provider "jar" not found
at java.nio.file.FileSystems.newFileSystem(java.base@9-internal/FileSystems.java:362)
at java.nio.file.FileSystems.newFileSystem(java.base@9-internal/FileSystems.java:291)