diff --git a/.gitignore b/.gitignore
index 9f11b75..a8fe14d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,5 @@
 .idea/
+vendor/
+composer.phar
+composer.lock
+composer.json
diff --git a/phpunit.dist.xml b/phpunit.dist.xml
new file mode 100644
index 0000000..872ce41
--- /dev/null
+++ b/phpunit.dist.xml
@@ -0,0 +1,7 @@
+<phpunit
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/3.7/phpunit.xsd"
+        backupGlobals="true"
+        backupStaticAttributes="false"
+        bootstrap="tests/bootstrap.php">
+</phpunit>
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
new file mode 100644
index 0000000..42e16e6
--- /dev/null
+++ b/tests/bootstrap.php
@@ -0,0 +1,3 @@
+<?php
+require_once __DIR__ . '/../vendor/autoload.php';
+
diff --git a/tests/functionsTest.php b/tests/functionsTest.php
new file mode 100644
index 0000000..837fc89
--- /dev/null
+++ b/tests/functionsTest.php
@@ -0,0 +1,547 @@
+<?php
+session_start();
+use PHPUnit\Framework\TestCase;
+
+require_once (__DIR__ . '/../config.php');
+require_once (__DIR__ . '/../php/functions.php');
+
+class functionsTest extends TestCase
+{
+
+    public function resetPresets() {
+        global $phpcaptchaConfig;
+    
+        //do this to reenable the presets for the next checks...
+        $phpcaptchaConfig = array(
+            'stringLength' => 6,
+            'charsToUse' => 'abcdefghkmnprstuvwxyz23456789',
+            'strictLowerCase' => true,
+            'bgcolor' => array('r' => 0, 'g' => 0, 'b' => 0),
+            'textcolor' => array('r' => 255, 'g' => 255, 'b' => 255),
+            'font' => 'Lato-Regular.ttf',
+            'sessionName' => 'phpcaptcha',
+            'size' => array('width' => 200, 'height' => 50),
+            'fontsize' => 25,
+            'numberOfLines' => 6,
+            'thicknessOfLines' => 2,
+            'linecolor' => array('r' => 128, 'g' => 128, 'b' => 128)
+        );
+    
+        
+    }
+    
+    public function test_ConfigDone()
+    {
+        global $phpcaptchaConfig;
+    
+        $this->resetPresets();
+        
+        $this->assertEquals(6, $phpcaptchaConfig['stringLength']);
+    
+        $this->assertEquals('abcdefghkmnprstuvwxyz23456789', $phpcaptchaConfig['charsToUse']);
+    
+        $this->assertEquals(true, $phpcaptchaConfig['strictLowerCase']);
+    
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+
+        $this->assertEquals('Lato-Regular.ttf', $phpcaptchaConfig['font']);
+    
+        $this->assertEquals('phpcaptcha', $phpcaptchaConfig['sessionName']);
+    
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+        $this->assertEquals(25, $phpcaptchaConfig['fontsize']);
+
+        $this->assertEquals(6, $phpcaptchaConfig['numberOfLines']);
+    
+        $this->assertEquals(2, $phpcaptchaConfig['thicknessOfLines']);
+    
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+    }
+    
+    public function test_checkConfig() {
+        global $phpcaptchaConfig;
+    
+        $this->resetPresets();
+    
+        $phpcaptchaConfig['stringLength']="a";
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(6, $phpcaptchaConfig['stringLength']);
+    
+        $phpcaptchaConfig['stringLength']="";
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(6, $phpcaptchaConfig['stringLength']);
+    
+        $phpcaptchaConfig['stringLength']=0;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(6, $phpcaptchaConfig['stringLength']);
+    
+        $phpcaptchaConfig['stringLength']=-1;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(6, $phpcaptchaConfig['stringLength']);
+    
+        $phpcaptchaConfig['stringLength']=2.356;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(2, $phpcaptchaConfig['stringLength']);
+    
+        $phpcaptchaConfig['stringLength']=5;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(5, $phpcaptchaConfig['stringLength']);
+    
+        $phpcaptchaConfig['charsToUse']='';
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals('abcdefghkmnprstuvwxyz23456789', $phpcaptchaConfig['charsToUse']);
+    
+        $phpcaptchaConfig['charsToUse']=7898;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals('abcdefghkmnprstuvwxyz23456789', $phpcaptchaConfig['charsToUse']);
+    
+        $phpcaptchaConfig['charsToUse']='abcdefhgijklmo';
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals('abcdefhgijklmo', $phpcaptchaConfig['charsToUse']);
+    
+        
+        $phpcaptchaConfig['strictLowerCase']=7;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(true, $phpcaptchaConfig['strictLowerCase']);
+    
+        $phpcaptchaConfig['strictLowerCase']=false;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(false, $phpcaptchaConfig['strictLowerCase']);
+    
+        
+        $phpcaptchaConfig['bgcolor']=1;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']="abc";
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+
+        $phpcaptchaConfig['bgcolor']=array('r' => -1, 'g' => -1, 'b' => -1);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => -1, 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => 255, 'g' => -1, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => 255, 'g' => 255, 'b' => -1);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+
+        $phpcaptchaConfig['bgcolor']=array('r' => 256, 'g' => 256, 'b' => 256);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => 256, 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => 255, 'g' => 256, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => 255, 'g' => 255, 'b' => 256);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => "a", 'g' => "a", 'b' => "a");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => "a", 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => 255, 'g' => "a", 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => 255, 'g' => 255, 'b' => "a");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0), $phpcaptchaConfig['bgcolor']);
+    
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => "1.7", 'g' => "1.7", 'b' => "1.7");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 2, 'g' => 2, 'b' => 2), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => 1.7, 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 2, 'g' => 255, 'b' => 255), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => 255, 'g' => 1.7, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 2, 'b' => 255), $phpcaptchaConfig['bgcolor']);
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => 255, 'g' => 255, 'b' => 1.7);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 2), $phpcaptchaConfig['bgcolor']);
+    
+    
+    
+    
+        $phpcaptchaConfig['bgcolor']=array('r' => "1", 'g' => "2", 'b' => "3");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 1, 'g' => 2, 'b' => 3), $phpcaptchaConfig['bgcolor']);
+    
+    
+    
+        $phpcaptchaConfig['textcolor']=1;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']="abc";
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+    
+        $phpcaptchaConfig['textcolor']=array('r' => -1, 'g' => -1, 'b' => -1);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => -1, 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => 255, 'g' => -1, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => 255, 'g' => 255, 'b' => -1);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+    
+        $phpcaptchaConfig['textcolor']=array('r' => 256, 'g' => 256, 'b' => 256);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => 256, 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => 255, 'g' => 256, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => 255, 'g' => 255, 'b' => 256);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+    
+        $phpcaptchaConfig['textcolor']=array('r' => "a", 'g' => "a", 'b' => "a");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => "a", 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => 255, 'g' => "a", 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => 255, 'g' => 255, 'b' => "a");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+    
+        $phpcaptchaConfig['textcolor']=array('r' => "1.7", 'g' => "1.7", 'b' => "1.7");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 2, 'g' => 2, 'b' => 2), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => 1.7, 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 2, 'g' => 255, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => 255, 'g' => 1.7, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 2, 'b' => 255), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => 255, 'g' => 255, 'b' => 1.7);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 2), $phpcaptchaConfig['textcolor']);
+    
+    
+    
+    
+        $phpcaptchaConfig['textcolor']=array('r' => "1", 'g' => "2", 'b' => "3");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 1, 'g' => 2, 'b' => 3), $phpcaptchaConfig['textcolor']);
+    
+        $phpcaptchaConfig['textcolor']=array('r' => "1", 'g' => "2", 'b' => "3");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 1, 'g' => 2, 'b' => 3), $phpcaptchaConfig['textcolor']);
+    
+        
+        //do not test font negative, since asstering an error would call "die()"
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals('Lato-Regular.ttf', $phpcaptchaConfig['font']);
+    
+        
+        //do not test sessionname negative, since asstering an error would call "die()"
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals('phpcaptcha', $phpcaptchaConfig['sessionName']);
+    
+    
+        $phpcaptchaConfig['size']='';
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+        $phpcaptchaConfig['size']='abc';
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+        $phpcaptchaConfig['size']=1.9;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+
+        
+        $phpcaptchaConfig['size']=array('width' => '', 'height' => '');
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+    
+        $phpcaptchaConfig['size']=array('width' => 1.9, 'height' => 7);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+        $phpcaptchaConfig['size']=array('width' => 7, 'height' => 1.9);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+        $phpcaptchaConfig['size']=array('width' => 7, 'height' => 'a');
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+        $phpcaptchaConfig['size']=array('width' => 'a', 'height' => 7);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+    
+        $phpcaptchaConfig['size']=array('width' => 1.9, 'height' => 50);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+        $phpcaptchaConfig['size']=array('width' => 200, 'height' => 1.9);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+        $phpcaptchaConfig['size']=array('width' => 200, 'height' => 'a');
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+        $phpcaptchaConfig['size']=array('width' => 'a', 'height' => 50);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 50), $phpcaptchaConfig['size']);
+    
+    
+        $phpcaptchaConfig['size']=array('width' => 101.9, 'height' => 50);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 102, 'height' => 50), $phpcaptchaConfig['size']);
+    
+        $phpcaptchaConfig['size']=array('width' => 200, 'height' => 100.9);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 200, 'height' => 101), $phpcaptchaConfig['size']);
+        
+
+        $phpcaptchaConfig['size']=array('width' => 500, 'height' => 100);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('width' => 500, 'height' => 100), $phpcaptchaConfig['size']);
+    
+        $phpcaptchaConfig['fontsize']='';
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(25, $phpcaptchaConfig['fontsize']);
+    
+        $phpcaptchaConfig['fontsize']=1;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(25, $phpcaptchaConfig['fontsize']);
+    
+        $phpcaptchaConfig['fontsize']=-1;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(25, $phpcaptchaConfig['fontsize']);
+    
+        $phpcaptchaConfig['fontsize']=25.8;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(26, $phpcaptchaConfig['fontsize']);
+    
+        $phpcaptchaConfig['fontsize']=27;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(27, $phpcaptchaConfig['fontsize']);
+    
+    
+        $phpcaptchaConfig['numberOfLines']='';
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(6, $phpcaptchaConfig['numberOfLines']);
+    
+        $phpcaptchaConfig['numberOfLines']=1;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(1, $phpcaptchaConfig['numberOfLines']);
+    
+        $phpcaptchaConfig['numberOfLines']=-1;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(6, $phpcaptchaConfig['numberOfLines']);
+    
+        $phpcaptchaConfig['numberOfLines']=25.8;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(26, $phpcaptchaConfig['numberOfLines']);
+    
+        $phpcaptchaConfig['numberOfLines']=27;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(27, $phpcaptchaConfig['numberOfLines']);
+    
+    
+        $phpcaptchaConfig['thicknessOfLines']='';
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(2, $phpcaptchaConfig['thicknessOfLines']);
+    
+        $phpcaptchaConfig['thicknessOfLines']=1;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(1, $phpcaptchaConfig['thicknessOfLines']);
+    
+        $phpcaptchaConfig['thicknessOfLines']=-1;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(2, $phpcaptchaConfig['thicknessOfLines']);
+    
+        $phpcaptchaConfig['thicknessOfLines']=25.8;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(26, $phpcaptchaConfig['thicknessOfLines']);
+    
+        $phpcaptchaConfig['thicknessOfLines']=27;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(27, $phpcaptchaConfig['thicknessOfLines']);
+    
+    
+    
+        $phpcaptchaConfig['linecolor']=1;
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']="abc";
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+    
+        $phpcaptchaConfig['linecolor']=array('r' => -1, 'g' => -1, 'b' => -1);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => -1, 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => 255, 'g' => -1, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => 255, 'g' => 255, 'b' => -1);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+    
+        $phpcaptchaConfig['linecolor']=array('r' => 256, 'g' => 256, 'b' => 256);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => 256, 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => 255, 'g' => 256, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => 255, 'g' => 255, 'b' => 256);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+    
+        $phpcaptchaConfig['linecolor']=array('r' => "a", 'g' => "a", 'b' => "a");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => "a", 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => 255, 'g' => "a", 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => 255, 'g' => 255, 'b' => "a");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 128, 'g' => 128, 'b' => 128), $phpcaptchaConfig['linecolor']);
+    
+    
+        $phpcaptchaConfig['linecolor']=array('r' => "1.7", 'g' => "1.7", 'b' => "1.7");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 2, 'g' => 2, 'b' => 2), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => 1.7, 'g' => 255, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 2, 'g' => 255, 'b' => 255), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => 255, 'g' => 1.7, 'b' => 255);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 2, 'b' => 255), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => 255, 'g' => 255, 'b' => 1.7);
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 2), $phpcaptchaConfig['linecolor']);
+
+
+        $phpcaptchaConfig['linecolor']=array('r' => "1", 'g' => "2", 'b' => "3");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 1, 'g' => 2, 'b' => 3), $phpcaptchaConfig['linecolor']);
+    
+        $phpcaptchaConfig['linecolor']=array('r' => "1", 'g' => "2", 'b' => "3");
+        checkConfig($phpcaptchaConfig);
+        $this->assertEquals(array('r' => 1, 'g' => 2, 'b' => 3), $phpcaptchaConfig['linecolor']);
+    
+    }
+
+    public function test_getRandomString() {
+        global $phpcaptchaConfig;
+    
+        $this->resetPresets();
+    
+        $string = getRandomString($phpcaptchaConfig);
+        $this->assertEquals(6, strlen($string));
+
+        $phpcaptchaConfig['stringLength'] = 12;
+        $string = getRandomString($phpcaptchaConfig);
+        $this->assertEquals(12, strlen($string));
+    
+        $this->resetPresets();
+    
+        $string = getRandomString($phpcaptchaConfig);
+        $this->assertEquals(6, strlen($string));
+    
+    
+    }
+    
+    function test_setSession() {
+        
+        global $phpcaptchaConfig;
+        
+        $this->resetPresets();
+        
+        setSession($phpcaptchaConfig, "someBasicString");
+        $sessionvalue = $_SESSION[$phpcaptchaConfig['sessionName']];
+        $this->assertEquals("someBasicString", $sessionvalue);
+        
+        
+    }
+}
\ No newline at end of file