created unittests and factored out version test into seperate method

lib/app.php

@@ -223,8 +223,7 @@ class OC_App{
 			// check if the app is compatible with this version of ownCloud
 			$info=OC_App::getAppInfo($app);
 			$version=OC_Util::getVersion();
-			$fullVersion = (float) ($version[0] . '.' . $version[1] . $version[2]);
-			if(!isset($info['require']) or ($fullVersion < (float) $info['require'])) {
+			if(!isset($info['require']) or !self::isAppVersionCompatible($version, $info['require'])) {
 				OC_Log::write('core',
 					'App "'.$info['name'].'" can\'t be installed because it is'
 					.' not compatible with this version of ownCloud',
@@ -852,8 +851,7 @@ class OC_App{
 		foreach($apps as $app) {
 			// check if the app is compatible with this version of ownCloud
 			$info = OC_App::getAppInfo($app);
-			$fullVersion = (float) ($version[0] . '.' . $version[1] . $version[2]);
-			if(!isset($info['require']) or ($fullVersion < (float) $info['require'])) {
+			if(!isset($info['require']) or !self::isAppVersionCompatible($version, $info['require'])) {
 				OC_Log::write('core',
 					'App "'.$info['name'].'" ('.$app.') can\'t be used because it is'
 					.' not compatible with this version of ownCloud',
@@ -864,6 +862,36 @@ class OC_App{
 		}
 	}
 
+
+	/**
+	 * Compares the app version with the owncloud version to see if the app 
+	 * requires a newer version than the currently active one
+	 * @param array $owncloudVersions array with 3 entries: major minor bugfix
+	 * @param string $appRequired the required version from the xml 
+	 * major.minor.bugfix
+	 * @return boolean true if compatible, otherwise false
+	 */
+	public static function isAppVersionCompatible($owncloudVersions, $appRequired){
+		$appVersions = explode('.', $appRequired);
+
+		for($i=0; $i<count($appVersions); $i++){
+			$appVersion = (int) $appVersions[$i];
+
+			if(isset($owncloudVersions[$i])){
+				$owncloudVersion = $owncloudVersions[$i];
+			} else {
+				$owncloudVersion = 0;
+			}
+
+			if($owncloudVersion < $appVersion){
+				return false;
+			}
+		}
+
+		return true;
+	}
+
+
 	/**
 	 * get the installed version of all apps
 	 */

tests/lib/app.php

@@ -0,0 +1,52 @@
+<?php
+/**
+ * Copyright (c) 2012 Bernhard Posselt <nukeawhale@gmail.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+class Test_App extends PHPUnit_Framework_TestCase {
+
+	
+	public function testIsAppVersionCompatibleSingleOCNumber(){
+		$oc = array(4);
+		$app = '4.0';
+
+		$this->assertTrue(OC_App::isAppVersionCompatible($oc, $app));
+	}
+
+	
+	public function testIsAppVersionCompatibleMultipleOCNumber(){
+		$oc = array(4, 3, 1);
+		$app = '4.3';
+
+		$this->assertTrue(OC_App::isAppVersionCompatible($oc, $app));
+	}
+
+
+	public function testIsAppVersionCompatibleMultipleAppNumber(){
+		$oc = array(4);
+		$app = '4';
+
+		$this->assertTrue(OC_App::isAppVersionCompatible($oc, $app));
+	}
+
+
+	public function testIsAppVersionCompatibleSingleAppNumber(){
+		$oc = array(4, 3);
+		$app = '4';
+
+		$this->assertTrue(OC_App::isAppVersionCompatible($oc, $app));
+	}
+
+	
+	public function testIsAppVersionCompatibleShouldFail(){
+		$oc = array(4, 3, 1);
+		$app = '4.3.2';
+
+		$this->assertFalse(OC_App::isAppVersionCompatible($oc, $app));
+	}
+
+
+}