jimfs - An in-memory file system for Java 7+

Jimfs is an in-memory implementation of Java 7's java.nio.file abstract file system API. imfs supports almost all the APIs under java.nio.file. Jimfs also supports creating file systems that, for example, use Windows-style paths and (to an extent) behavior. In general, however, file system behavior is modeled after UNIX and may not exactly match any particular real file system or platform.