private void visit(Set<String> names, String prefix, File file) {
for (File child : file.listFiles()) {
if (child.isFile()) {
names.add(prefix + child.getName());
} else if (child.isDirectory()) {
visit(names, prefix + child.getName() + "/", child);
}
}
}
/** Asserts that this file contains exactly the given set of descendants. */
public TestFile assertHasDescendants(String... descendants) {
Set<String> actual = new TreeSet<String>();
assertIsDir();
visit(actual, "", this);
Set<String> expected = new TreeSet<String>(Arrays.asList(descendants));
Set<String> extras = new TreeSet<String>(actual);
extras.removeAll(expected);
Set<String> missing = new TreeSet<String>(expected);
missing.removeAll(actual);
assertEquals(
String.format(
"For dir: %s, extra files: %s, missing files: %s, expected: %s",
this, extras, missing, expected),
expected,
actual);
return this;
}