@Override public final String toString() {
        return toURI().toString();
    }
@Test
    public void testToString() throws IOException {
        String parentFolder = "parentFolder";
        File parentFile = tmp.newFolder(parentFolder);
        String child = "child";
        File childFile = new File(parentFile, child);
        VirtualFile vf = new VirtualFileMinimalImplementation(childFile);
        String vfString = vf.toString();
        assertThat(vfString, startsWith("file:/"));
        assertThat(vfString, endsWith(child));
    }