Fix form tests utilizing Mockery's partial mock functionality

Since an update of Mockery, partial mocks do not call the constructor
of their mocked classes anymore without explicitly passing a non empty
array. This is a regression of the following bug:
mockery/mockery#144

test/php/application/forms/Config/Authentication/DbBackendFormTest.php

@@ -31,7 +31,8 @@ public function testValidBackendIsValid()
             ->shouldReceive('count')
             ->andReturn(2);
 
-        $form = Mockery::mock('Icinga\Forms\Config\Authentication\DbBackendForm[getView]');
+        // Passing array(null) is required to make Mockery call the constructor...
+        $form = Mockery::mock('Icinga\Forms\Config\Authentication\DbBackendForm[getView]', array(null));
         $form->shouldReceive('getView->escape')
             ->with(Mockery::type('string'))
             ->andReturnUsing(function ($s) { return $s; });
@@ -56,7 +57,8 @@ public function testInvalidBackendIsNotValid()
             ->shouldReceive('count')
             ->andReturn(0);
 
-        $form = Mockery::mock('Icinga\Forms\Config\Authentication\DbBackendForm[getView]');
+        // Passing array(null) is required to make Mockery call the constructor...
+        $form = Mockery::mock('Icinga\Forms\Config\Authentication\DbBackendForm[getView]', array(null));
         $form->shouldReceive('getView->escape')
             ->with(Mockery::type('string'))
             ->andReturnUsing(function ($s) { return $s; });

test/php/application/forms/Config/Authentication/LdapBackendFormTest.php

@@ -31,7 +31,8 @@ public function testValidBackendIsValid()
         Mockery::mock('overload:Icinga\Authentication\Backend\LdapUserBackend')
             ->shouldReceive('assertAuthenticationPossible')->andReturnNull();
 
-        $form = Mockery::mock('Icinga\Forms\Config\Authentication\LdapBackendForm[getView]');
+        // Passing array(null) is required to make Mockery call the constructor...
+        $form = Mockery::mock('Icinga\Forms\Config\Authentication\LdapBackendForm[getView]', array(null));
         $form->shouldReceive('getView->escape')
             ->with(Mockery::type('string'))
             ->andReturnUsing(function ($s) { return $s; });
@@ -55,7 +56,8 @@ public function testInvalidBackendIsNotValid()
         Mockery::mock('overload:Icinga\Authentication\Backend\LdapUserBackend')
             ->shouldReceive('assertAuthenticationPossible')->andThrow(new AuthenticationException);
 
-        $form = Mockery::mock('Icinga\Forms\Config\Authentication\LdapBackendForm[getView]');
+        // Passing array(null) is required to make Mockery call the constructor...
+        $form = Mockery::mock('Icinga\Forms\Config\Authentication\LdapBackendForm[getView]', array(null));
         $form->shouldReceive('getView->escape')
             ->with(Mockery::type('string'))
             ->andReturnUsing(function ($s) { return $s; });

test/php/application/forms/Config/Resource/LdapResourceFormTest.php

@@ -29,7 +29,8 @@ public function testValidLdapResourceIsValid()
             Mockery::mock()->shouldReceive('testCredentials')->once()->andReturn(true)->getMock()
         );
 
-        $form = Mockery::mock('Icinga\Forms\Config\Resource\LdapResourceForm[getView]');
+        // Passing array(null) is required to make Mockery call the constructor...
+        $form = Mockery::mock('Icinga\Forms\Config\Resource\LdapResourceForm[getView]', array(null));
         $form->shouldReceive('getView->escape')
             ->with(Mockery::type('string'))
             ->andReturnUsing(function ($s) { return $s; });
@@ -51,7 +52,8 @@ public function testInvalidLdapResourceIsNotValid()
             Mockery::mock()->shouldReceive('testCredentials')->once()->andThrow('\Exception')->getMock()
         );
 
-        $form = Mockery::mock('Icinga\Forms\Config\Resource\LdapResourceForm[getView]');
+        // Passing array(null) is required to make Mockery call the constructor...
+        $form = Mockery::mock('Icinga\Forms\Config\Resource\LdapResourceForm[getView]', array(null));
         $form->shouldReceive('getView->escape')
             ->with(Mockery::type('string'))
             ->andReturnUsing(function ($s) { return $s; });