diff --git a/t/plugin_tests/auth::auth_flat_file b/t/plugin_tests/auth::auth_flat_file
new file mode 100644
index 0000000..7f36f23
--- /dev/null
+++ b/t/plugin_tests/auth::auth_flat_file
@@ -0,0 +1,27 @@
+# -*-perl-*- [emacs]
+
+sub register_tests {
+    my $self = shift;
+    $self->register_test("test_authsql", 3);
+}
+
+my @u_list = qw ( good bad none );
+my %u_data = (
+	      good => [ 'good@example.com', OK, 'good_pass' ],
+	      bad => [ 'bad@example.com', DENY, 'not_bad_pass' ],
+	      none => [ 'none@example.com', DECLINED, '' ],
+	      );
+
+sub test_authsql {
+    my $self = shift;
+    my ($tran, $ret, $note, $u, $r, $p, $a );
+    $tran = $self->qp->transaction;
+    for $u ( @u_list ) {
+	( $a,$r,$p ) = @{$u_data{$u}};
+	($ret, $note) = $self->authsql($tran,'CRAMMD5',$a,$p);
+	defined $note or $note='No-Message';
+	is ($ret, $r, $note);
+	# - for debugging.
+	# warn "$note\n";
+    }
+}
diff --git a/t/plugin_tests/auth::authdeny b/t/plugin_tests/auth::authdeny
new file mode 100644
index 0000000..08c8cd3
--- /dev/null
+++ b/t/plugin_tests/auth::authdeny
@@ -0,0 +1,14 @@
+# -*-perl-*- [emacs]
+
+sub register_tests {
+    my $self = shift;
+    $self->register_test("test_authdeny", 1);
+}
+
+sub test_authdeny {
+    my $self = shift;
+    my $address = Qpsmtpd::Address->parse('<me@example.com>');
+    my ($ret, $note) = $self->hook_auth($self->qp->transaction, 'bogus_method',
+					'bogus_user');
+    is ($ret, DECLINED, "bogus_user is not free to abuse my relay");
+}
diff --git a/t/plugin_tests/auth::authnull b/t/plugin_tests/auth::authnull
new file mode 100644
index 0000000..3a412f7
--- /dev/null
+++ b/t/plugin_tests/auth::authnull
@@ -0,0 +1,14 @@
+# -*-perl-*- [emacs]
+
+sub register_tests {
+    my $self = shift;
+    $self->register_test("test_authnull", 1);
+}
+
+sub test_authnull {
+    my $self = shift;
+    my $address = Qpsmtpd::Address->parse('<me@example.com>');
+    my ($ret, $note) = $self->hook_auth($self->qp->transaction, 'bogus_method',
+					'bogus_user');
+    is ($ret, OK, "bogus_user is free to abuse my relay");
+}