Start of tests for cyrsasl module

diff --git a/test/ejabberd_cyrsasl_test.exs b/test/ejabberd_cyrsasl_test.exs
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+# ----------------------------------------------------------------------
+#
+# ejabberd, Copyright (C) 2002-2016   ProcessOne
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# ----------------------------------------------------------------------
+
+defmodule EjabberdCyrsaslTest do
+  @author "pawel@process-one.net"
+
+  use ExUnit.Case, async: true
+
+  setup_all do
+    :mnesia.start
+    :ok = start_module(:stringprep)
+    :ok = start_module(:jid)
+    :ok = :ejabberd_config.start(["domain1", "domain2"], [])
+    :ok = :cyrsasl.start
+    cyrstate = :cyrsasl.server_new("test", "test", "test", :ok, &get_password/1,
+                                   &check_password/3, &check_password_digest/5)
+    {:ok, cyrstate: cyrstate}
+  end
+
+  test "Plain text (correct user and pass)", context do
+    step1 = :cyrsasl.server_start(context[:cyrstate], "PLAIN", <<0,"user1",0,"pass">>)
+    assert {:ok, _} = step1
+    {:ok, kv} = step1
+    assert kv[:authzid] == "user1", "got correct user"
+  end
+
+  test "Plain text (correct user wrong pass)", context do
+    step1 = :cyrsasl.server_start(context[:cyrstate], "PLAIN", <<0,"user1",0,"badpass">>)
+    assert step1 == {:error, "not-authorized", "user1"}, "got error response"
+  end
+
+  test "Plain text (wrong user wrong pass)", context do
+    step1 = :cyrsasl.server_start(context[:cyrstate], "PLAIN", <<0,"nouser1",0,"badpass">>)
+    assert step1 == {:error, "not-authorized", "nouser1"}, "got error response"
+  end
+
+  defp start_module(module) do
+    case apply(module, :start, []) do
+      :ok -> :ok
+      {:error, {:already_started, _}} -> :ok
+      other -> other
+    end
+  end
+
+  defp get_password(user) do
+    if user == "user1" or user == "user2" do
+      {"pass", :internal}
+    else
+      :false
+    end
+  end
+
+  defp check_password(user, authzid, pass) do
+    case get_password(authzid) do
+      {^pass, mod} ->
+        {true, mod}
+      _ ->
+        false
+    end
+  end
+
+  defp check_password_digest(user, authzid, pass, digest, digest_gen) do
+    case get_password(authzid) do
+      {spass, mod} ->
+        if digest_gen.(spass) == pass do
+          {true, mod}
+        else
+          false
+        end
+      _ ->
+        false
+    end
+  end
+end