in src/main/java/org/apache/sling/testing/mock/jcr/MockGroup.java [90:104]
public boolean isMember(@NotNull Authorizable authorizable) throws RepositoryException {
boolean value = declaredMembers.containsValue(authorizable);
if (!value) {
// groups
for (Authorizable m : declaredMembers.values()) {
if (m.isGroup()) {
value = ((Group)m).isDeclaredMember(authorizable);
}
if (value) {
break;
}
}
}
return value;
}