Allow null as a password for the guest user (#79)

* Allow null as a password for the guest user
* Update PHPUnit
* Tweak data provider signrature in CreateTest

* Update phpunit to the stable release

* Fix typos

Author: rybakit

src/tarantool.c

@@ -888,7 +888,7 @@ PHP_METHOD(tarantool_class, authenticate) {
 	char *login; int login_len;
 	char *passwd = NULL; int passwd_len = 0;
 
-	TARANTOOL_PARSE_PARAMS(id, "s|s", &login, &login_len,
+	TARANTOOL_PARSE_PARAMS(id, "s|s!", &login, &login_len,
 			&passwd, &passwd_len);
 	TARANTOOL_FETCH_OBJECT(obj, id);
 	obj->login = pestrdup(login, 1);

test/CreateTest.php

@@ -1,4 +1,5 @@
 <?php
+
 class CreateTest extends PHPUnit_Framework_TestCase
 {
     protected static $port, $tm;
@@ -89,7 +90,7 @@ public function test_05_flush()
      * @expectedException Exception
      * @expectedExceptionMessage Query error
      */
-    public function test_06_bad_cridentials()
+    public function test_06_bad_credentials()
     {
         $c = new Tarantool('localhost', self::$port);
         $c->connect();
@@ -101,7 +102,7 @@ public function test_06_bad_cridentials()
      * @expectedException Exception
      * @expectedExceptionMessage Query error
      */
-    public function test_07_bad_guest_cridentials()
+    public function test_07_bad_guest_credentials()
     {
         $c = new Tarantool('localhost', self::$port);
         $c->connect();
@@ -113,20 +114,36 @@ public function test_07_bad_guest_cridentials()
      * @expectedException Exception
      * @expectedExceptionMessage Query error
      */
-    public function test_07_01_bad_guest_cridentials()
+    public function test_07_01_bad_guest_credentials()
     {
         $c = new Tarantool('localhost', self::$port);
         $c->connect();
         $this->assertTrue($c->ping());
         $c->authenticate('guest', '');
     }
 
-    public function test_08_good_cridentials()
+    /**
+     * @dataProvider provideGoodCredentials
+     */
+    public function test_08_good_credentials($username, $password = null)
     {
         $c = new Tarantool('localhost', self::$port);
         $c->connect();
         $this->assertTrue($c->ping());
-        $c->authenticate('guest');
+
+        (1 === func_num_args()) 
+            ? $c->authenticate($username)
+            : $c->authenticate($username, $password);
+
         $this->assertTrue($c->ping());
     }
+
+    public static function provideGoodCredentials()
+    {
+        return [
+            ['guest'],
+            ['guest', null],
+        ];
+    }
 }
+