application: refactor version checks, move to ApplicationUtils

Relates to #372

Modifications:
 - move checkUpdate() to ApplicationUtils
 - reduce file I/O operations during version checks
 - apply coding conventions
 - add test coverage

Tools:
 - create a sandbox directory for tests

Signed-off-by: VirtualTam <virtualtam@flibidi.net>

4 files changed, 223 insertions, 5 deletions

diff --git a/tests/ApplicationUtilsTest.php b/tests/ApplicationUtilsTest.php
index 01301e68..437c21fd 100644
--- a/tests/ApplicationUtilsTest.php
+++ b/tests/ApplicationUtilsTest.php
@@ -5,12 +5,230 @@
 
 require_once 'application/ApplicationUtils.php';
 
+/**
+ * Fake ApplicationUtils class to avoid HTTP requests
+ */
+class FakeApplicationUtils extends ApplicationUtils
+{
+    public static $VERSION_CODE = '';
+
+    /**
+     * Toggle HTTP requests, allow overriding the version code
+     */
+    public static function getLatestGitVersionCode($url, $timeout=0)
+    {
+        return self::$VERSION_CODE;
+    }
+}
+
 
 /**
  * Unitary tests for Shaarli utilities
  */
 class ApplicationUtilsTest extends PHPUnit_Framework_TestCase
 {
+    protected static $testUpdateFile = 'sandbox/update.txt';
+    protected static $testVersion = '0.5.0';
+    protected static $versionPattern = '/^\d+\.\d+\.\d+$/';
+
+    /**
+     * Reset test data for each test
+     */
+    public function setUp()
+    {
+        FakeApplicationUtils::$VERSION_CODE = '';
+        if (file_exists(self::$testUpdateFile)) {
+            unlink(self::$testUpdateFile);
+        }
+    }
+
+    /**
+     * Retrieve the latest version code available on Git
+     *
+     * Expected format: Semantic Versioning - major.minor.patch
+     */
+    public function testGetLatestGitVersionCode()
+    {
+        $testTimeout = 10;
+
+        $this->assertEquals(
+            '0.5.4',
+            ApplicationUtils::getLatestGitVersionCode(
+                'https://raw.githubusercontent.com/shaarli/Shaarli/'
+               .'v0.5.4/shaarli_version.php',
+                $testTimeout
+            )
+        );
+        $this->assertRegexp(
+            self::$versionPattern,
+            ApplicationUtils::getLatestGitVersionCode(
+                'https://raw.githubusercontent.com/shaarli/Shaarli/'
+               .'master/shaarli_version.php',
+                $testTimeout
+            )
+        );
+    }
+
+    /**
+     * Attempt to retrieve the latest version from an invalid URL
+     */
+    public function testGetLatestGitVersionCodeInvalidUrl()
+    {
+        $this->assertFalse(
+            ApplicationUtils::getLatestGitVersionCode('htttp://null.io', 0)
+        );
+    }
+
+    /**
+     * Test update checks - the user is logged off
+     */
+    public function testCheckUpdateLoggedOff()
+    {
+        $this->assertFalse(
+            ApplicationUtils::checkUpdate(self::$testVersion, 'null', 0, false, false)
+        );
+    }
+
+    /**
+     * Test update checks - the user has disabled updates
+     */
+    public function testCheckUpdateUserDisabled()
+    {
+        $this->assertFalse(
+            ApplicationUtils::checkUpdate(self::$testVersion, 'null', 0, false, true)
+        );
+    }
+
+    /**
+     * A newer version is available
+     */
+    public function testCheckUpdateNewVersionNew()
+    {
+        $newVersion = '1.8.3';
+        FakeApplicationUtils::$VERSION_CODE = $newVersion;
+
+        $version = FakeApplicationUtils::checkUpdate(
+            self::$testVersion,
+            self::$testUpdateFile,
+            100,
+            true,
+            true
+        );
+
+        $this->assertEquals($newVersion, $version);
+    }
+
+    /**
+     * No available information about versions
+     */
+    public function testCheckUpdateNewVersionUnavailable()
+    {
+        $version = FakeApplicationUtils::checkUpdate(
+            self::$testVersion,
+            self::$testUpdateFile,
+            100,
+            true,
+            true
+        );
+
+        $this->assertFalse($version);
+    }
+
+    /**
+     * Shaarli is up-to-date
+     */
+    public function testCheckUpdateNewVersionUpToDate()
+    {
+        FakeApplicationUtils::$VERSION_CODE = self::$testVersion;
+
+        $version = FakeApplicationUtils::checkUpdate(
+            self::$testVersion,
+            self::$testUpdateFile,
+            100,
+            true,
+            true
+        );
+
+        $this->assertFalse($version);
+    }
+
+    /**
+     * Time-traveller's Shaarli
+     */
+    public function testCheckUpdateNewVersionMaartiMcFly()
+    {
+        FakeApplicationUtils::$VERSION_CODE = '0.4.1';
+
+        $version = FakeApplicationUtils::checkUpdate(
+            self::$testVersion,
+            self::$testUpdateFile,
+            100,
+            true,
+            true
+        );
+
+        $this->assertFalse($version);
+    }
+
+    /**
+     * The version has been checked recently and Shaarli is up-to-date
+     */
+    public function testCheckUpdateNewVersionTwiceUpToDate()
+    {
+        FakeApplicationUtils::$VERSION_CODE = self::$testVersion;
+
+        // Create the update file
+        $version = FakeApplicationUtils::checkUpdate(
+            self::$testVersion,
+            self::$testUpdateFile,
+            100,
+            true,
+            true
+        );
+
+        $this->assertFalse($version);
+
+        // Reuse the update file
+        $version = FakeApplicationUtils::checkUpdate(
+            self::$testVersion,
+            self::$testUpdateFile,
+            100,
+            true,
+            true
+        );
+
+        $this->assertFalse($version);
+    }
+
+    /**
+     * The version has been checked recently and Shaarli is outdated
+     */
+    public function testCheckUpdateNewVersionTwiceOutdated()
+    {
+        $newVersion = '1.8.3';
+        FakeApplicationUtils::$VERSION_CODE = $newVersion;
+
+        // Create the update file
+        $version = FakeApplicationUtils::checkUpdate(
+            self::$testVersion,
+            self::$testUpdateFile,
+            100,
+            true,
+            true
+        );
+        $this->assertEquals($newVersion, $version);
+
+        // Reuse the update file
+        $version = FakeApplicationUtils::checkUpdate(
+            self::$testVersion,
+            self::$testUpdateFile,
+            100,
+            true,
+            true
+        );
+        $this->assertEquals($newVersion, $version);
+    }
+
     /**
      * Check supported PHP versions
      */
diff --git a/tests/CacheTest.php b/tests/CacheTest.php
index aa5395b0..eacd4487 100644
--- a/tests/CacheTest.php
+++ b/tests/CacheTest.php
@@ -11,10 +11,10 @@ require_once 'application/Cache.php';
 /**
  * Unitary tests for cached pages
  */
-class CachedTest extends PHPUnit_Framework_TestCase
+class CacheTest extends PHPUnit_Framework_TestCase
 {
     // test cache directory
-    protected static $testCacheDir = 'tests/dummycache';
+    protected static $testCacheDir = 'sandbox/dummycache';
 
     // dummy cached file names / content
     protected static $pages = array('a', 'toto', 'd7b59c');
@@ -56,7 +56,7 @@ class CachedTest extends PHPUnit_Framework_TestCase
     public function testPurgeCachedPagesMissingDir()
     {
         $this->assertEquals(
-            'Cannot purge tests/dummycache_missing: no directory',
+            'Cannot purge sandbox/dummycache_missing: no directory',
             purgeCachedPages(self::$testCacheDir.'_missing')
         );
     }
diff --git a/tests/CachedPageTest.php b/tests/CachedPageTest.php
index e97af030..51565cd6 100644
--- a/tests/CachedPageTest.php
+++ b/tests/CachedPageTest.php
@@ -11,7 +11,7 @@ require_once 'application/CachedPage.php';
 class CachedPageTest extends PHPUnit_Framework_TestCase
 {
     // test cache directory
-    protected static $testCacheDir = 'tests/pagecache';
+    protected static $testCacheDir = 'sandbox/pagecache';
     protected static $url = 'http://shaar.li/?do=atom';
     protected static $filename;
 
diff --git a/tests/LinkDBTest.php b/tests/LinkDBTest.php
index ff917f6d..7b22b270 100644
--- a/tests/LinkDBTest.php
+++ b/tests/LinkDBTest.php
@@ -16,7 +16,7 @@ require_once 'tests/utils/ReferenceLinkDB.php';
 class LinkDBTest extends PHPUnit_Framework_TestCase
 {
     // datastore to test write operations
-    protected static $testDatastore = 'tests/datastore.php';
+    protected static $testDatastore = 'sandbox/datastore.php';
     protected static $refDB = null;
     protected static $publicLinkDB = null;
     protected static $privateLinkDB = null;