UserImpl extends AuthorizableImpl implements User { @Override public boolean isSystemUser() { return false; } UserImpl(String id, Tree tree, UserManagerImpl userManager); @Override boolean isGroup(); @NotNull @Override Principal getPrincipal(); @Override boolean isAdmin(); @Override boolean isSystemUser(); @NotNull @Override Credentials getCredentials(); @NotNull @Override Impersonation getImpersonation(); @Override void changePassword(String password); @Override void changePassword(@Nullable String password, @NotNull String oldPassword); @Override void disable(@Nullable String reason); @Override boolean isDisabled(); @Nullable @Override String getDisabledReason();  }
@Test public void testIsSystemUser() { assertFalse(user.isSystemUser()); }