The jdtls server-JDK test asserted the "/jdk21" literal, but test_jdk now materializes real fixture directories, so the message carries platform-native separators and the assertion failed on Windows. Match the fixture's own home path instead.
Co-authored-by: a-rookie-of-C-language <186315048+a-rookie-of-C-language@users.noreply.github.com>