Merge branch 'master' into v0.12v0.12.1v0.12

3 files changed, 874 insertions, 0 deletions

diff --git a/tests/helper/ApplicationUtilsTest.php b/tests/helper/ApplicationUtilsTest.php
new file mode 100644
index 00000000..654857b9
--- /dev/null
+++ b/tests/helper/ApplicationUtilsTest.php
@@ -0,0 +1,415 @@
+<?php
+namespace Shaarli\Helper;
+
+use Shaarli\Config\ConfigManager;
+use Shaarli\FakeApplicationUtils;
+
+require_once 'tests/utils/FakeApplicationUtils.php';
+
+/**
+ * Unitary tests for Shaarli utilities
+ */
+class ApplicationUtilsTest extends \Shaarli\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
+     */
+    protected function setUp(): void
+    {
+        FakeApplicationUtils::$VERSION_CODE = '';
+        if (file_exists(self::$testUpdateFile)) {
+            unlink(self::$testUpdateFile);
+        }
+    }
+
+    /**
+     * Remove test version file if it exists
+     */
+    protected function tearDown(): void
+    {
+        if (is_file('sandbox/version.php')) {
+            unlink('sandbox/version.php');
+        }
+    }
+
+    /**
+     * Retrieve the latest version code available on Git
+     *
+     * Expected format: Semantic Versioning - major.minor.patch
+     */
+    public function testGetVersionCode()
+    {
+        $testTimeout = 10;
+
+        $this->assertEquals(
+            '0.5.4',
+            ApplicationUtils::getVersion(
+                'https://raw.githubusercontent.com/shaarli/Shaarli/'
+                .'v0.5.4/shaarli_version.php',
+                $testTimeout
+            )
+        );
+        $this->assertRegExp(
+            self::$versionPattern,
+            ApplicationUtils::getVersion(
+                'https://raw.githubusercontent.com/shaarli/Shaarli/'
+                .'latest/shaarli_version.php',
+                $testTimeout
+            )
+        );
+    }
+
+    /**
+     * Attempt to retrieve the latest version from an invalid File
+     */
+    public function testGetVersionCodeFromFile()
+    {
+        file_put_contents('sandbox/version.php', '<?php /* 1.2.3 */ ?>'. PHP_EOL);
+        $this->assertEquals(
+            '1.2.3',
+            ApplicationUtils::getVersion('sandbox/version.php', 1)
+        );
+    }
+
+    /**
+     * Attempt to retrieve the latest version from an invalid File
+     */
+    public function testGetVersionCodeInvalidFile()
+    {
+        $oldlog = ini_get('error_log');
+        ini_set('error_log', '/dev/null');
+        $this->assertFalse(
+            ApplicationUtils::getVersion('idontexist', 1)
+        );
+        ini_set('error_log', $oldlog);
+    }
+
+    /**
+     * 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 testCheckUpdateNewVersionAvailable()
+    {
+        $newVersion = '1.8.3';
+        FakeApplicationUtils::$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);
+    }
+
+    /**
+     * Test update checks - invalid Git branch
+     */
+    public function testCheckUpdateInvalidGitBranch()
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessageRegExp('/Invalid branch selected for updates/');
+
+        ApplicationUtils::checkUpdate('', 'null', 0, true, true, 'unstable');
+    }
+
+    /**
+     * Shaarli is up-to-date
+     */
+    public function testCheckUpdateNewVersionUpToDate()
+    {
+        FakeApplicationUtils::$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
+     */
+    public function testCheckSupportedPHPVersion()
+    {
+        $minVersion = '5.3';
+        $this->assertTrue(ApplicationUtils::checkPHPVersion($minVersion, '5.4.32'));
+        $this->assertTrue(ApplicationUtils::checkPHPVersion($minVersion, '5.5'));
+        $this->assertTrue(ApplicationUtils::checkPHPVersion($minVersion, '5.6.10'));
+    }
+
+    /**
+     * Check a unsupported PHP version
+     */
+    public function testCheckSupportedPHPVersion51()
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessageRegExp('/Your PHP version is obsolete/');
+
+        $this->assertTrue(ApplicationUtils::checkPHPVersion('5.3', '5.1.0'));
+    }
+
+    /**
+     * Check another unsupported PHP version
+     */
+    public function testCheckSupportedPHPVersion52()
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessageRegExp('/Your PHP version is obsolete/');
+
+        $this->assertTrue(ApplicationUtils::checkPHPVersion('5.3', '5.2'));
+    }
+
+    /**
+     * Checks resource permissions for the current Shaarli installation
+     */
+    public function testCheckCurrentResourcePermissions()
+    {
+        $conf = new ConfigManager('');
+        $conf->set('resource.thumbnails_cache', 'cache');
+        $conf->set('resource.config', 'data/config.php');
+        $conf->set('resource.data_dir', 'data');
+        $conf->set('resource.datastore', 'data/datastore.php');
+        $conf->set('resource.ban_file', 'data/ipbans.php');
+        $conf->set('resource.log', 'data/log.txt');
+        $conf->set('resource.page_cache', 'pagecache');
+        $conf->set('resource.raintpl_tmp', 'tmp');
+        $conf->set('resource.raintpl_tpl', 'tpl');
+        $conf->set('resource.theme', 'default');
+        $conf->set('resource.update_check', 'data/lastupdatecheck.txt');
+
+        $this->assertEquals(
+            array(),
+            ApplicationUtils::checkResourcePermissions($conf)
+        );
+    }
+
+    /**
+     * Checks resource permissions for a non-existent Shaarli installation
+     */
+    public function testCheckCurrentResourcePermissionsErrors()
+    {
+        $conf = new ConfigManager('');
+        $conf->set('resource.thumbnails_cache', 'null/cache');
+        $conf->set('resource.config', 'null/data/config.php');
+        $conf->set('resource.data_dir', 'null/data');
+        $conf->set('resource.datastore', 'null/data/store.php');
+        $conf->set('resource.ban_file', 'null/data/ipbans.php');
+        $conf->set('resource.log', 'null/data/log.txt');
+        $conf->set('resource.page_cache', 'null/pagecache');
+        $conf->set('resource.raintpl_tmp', 'null/tmp');
+        $conf->set('resource.raintpl_tpl', 'null/tpl');
+        $conf->set('resource.raintpl_theme', 'null/tpl/default');
+        $conf->set('resource.update_check', 'null/data/lastupdatecheck.txt');
+        $this->assertEquals(
+            array(
+                '"null/tpl" directory is not readable',
+                '"null/tpl/default" directory is not readable',
+                '"null/cache" directory is not readable',
+                '"null/cache" directory is not writable',
+                '"null/data" directory is not readable',
+                '"null/data" directory is not writable',
+                '"null/pagecache" directory is not readable',
+                '"null/pagecache" directory is not writable',
+                '"null/tmp" directory is not readable',
+                '"null/tmp" directory is not writable'
+            ),
+            ApplicationUtils::checkResourcePermissions($conf)
+        );
+    }
+
+    /**
+     * Checks resource permissions in minimal mode.
+     */
+    public function testCheckCurrentResourcePermissionsErrorsMinimalMode(): void
+    {
+        $conf = new ConfigManager('');
+        $conf->set('resource.thumbnails_cache', 'null/cache');
+        $conf->set('resource.config', 'null/data/config.php');
+        $conf->set('resource.data_dir', 'null/data');
+        $conf->set('resource.datastore', 'null/data/store.php');
+        $conf->set('resource.ban_file', 'null/data/ipbans.php');
+        $conf->set('resource.log', 'null/data/log.txt');
+        $conf->set('resource.page_cache', 'null/pagecache');
+        $conf->set('resource.raintpl_tmp', 'null/tmp');
+        $conf->set('resource.raintpl_tpl', 'null/tpl');
+        $conf->set('resource.raintpl_theme', 'null/tpl/default');
+        $conf->set('resource.update_check', 'null/data/lastupdatecheck.txt');
+
+        static::assertSame(
+            [
+                '"null/tpl" directory is not readable',
+                '"null/tpl/default" directory is not readable',
+                '"null/tmp" directory is not readable',
+                '"null/tmp" directory is not writable'
+            ],
+            ApplicationUtils::checkResourcePermissions($conf, true)
+        );
+    }
+
+    /**
+     * Check update with 'dev' as curent version (master branch).
+     * It should always return false.
+     */
+    public function testCheckUpdateDev()
+    {
+        $this->assertFalse(
+            ApplicationUtils::checkUpdate('dev', self::$testUpdateFile, 100, true, true)
+        );
+    }
+
+    /**
+     * Basic test of getPhpExtensionsRequirement()
+     */
+    public function testGetPhpExtensionsRequirementSimple(): void
+    {
+        static::assertCount(8, ApplicationUtils::getPhpExtensionsRequirement());
+        static::assertSame([
+            'name' => 'json',
+            'required' => true,
+            'desc' => 'Configuration parsing',
+            'loaded' => true,
+        ], ApplicationUtils::getPhpExtensionsRequirement()[0]);
+    }
+
+    /**
+     * Test getPhpEol with a known version: 7.4 -> 2022
+     */
+    public function testGetKnownPhpEol(): void
+    {
+        static::assertSame('2022-11-28', ApplicationUtils::getPhpEol('7.4.7'));
+    }
+
+    /**
+     * Test getPhpEol with an unknown version: 7.4 -> 2022
+     */
+    public function testGetUnknownPhpEol(): void
+    {
+        static::assertSame(
+            (((int) (new \DateTime())->format('Y')) + 2) . (new \DateTime())->format('-m-d'),
+            ApplicationUtils::getPhpEol('7.51.34')
+        );
+    }
+}
diff --git a/tests/helper/DailyPageHelperTest.php b/tests/helper/DailyPageHelperTest.php
new file mode 100644
index 00000000..5255b7b1
--- /dev/null
+++ b/tests/helper/DailyPageHelperTest.php
@@ -0,0 +1,262 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Helper;
+
+use Shaarli\Bookmark\Bookmark;
+use Shaarli\TestCase;
+use Slim\Http\Request;
+
+class DailyPageHelperTest extends TestCase
+{
+    /**
+     * @dataProvider getRequestedTypes
+     */
+    public function testExtractRequestedType(array $queryParams, string $expectedType): void
+    {
+        $request = $this->createMock(Request::class);
+        $request->method('getQueryParam')->willReturnCallback(function ($key) use ($queryParams): ?string {
+            return $queryParams[$key] ?? null;
+        });
+
+        $type = DailyPageHelper::extractRequestedType($request);
+
+        static::assertSame($type, $expectedType);
+    }
+
+    /**
+     * @dataProvider getRequestedDateTimes
+     */
+    public function testExtractRequestedDateTime(
+        string $type,
+        string $input,
+        ?Bookmark $bookmark,
+        \DateTimeInterface $expectedDateTime,
+        string $compareFormat = 'Ymd'
+    ): void {
+        $dateTime = DailyPageHelper::extractRequestedDateTime($type, $input, $bookmark);
+
+        static::assertSame($dateTime->format($compareFormat), $expectedDateTime->format($compareFormat));
+    }
+
+    public function testExtractRequestedDateTimeExceptionUnknownType(): void
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('Unsupported daily format type');
+
+        DailyPageHelper::extractRequestedDateTime('nope', null, null);
+    }
+
+    /**
+     * @dataProvider getFormatsByType
+     */
+    public function testGetFormatByType(string $type, string $expectedFormat): void
+    {
+        $format = DailyPageHelper::getFormatByType($type);
+
+        static::assertSame($expectedFormat, $format);
+    }
+
+    public function testGetFormatByTypeExceptionUnknownType(): void
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('Unsupported daily format type');
+
+        DailyPageHelper::getFormatByType('nope');
+    }
+
+    /**
+     * @dataProvider getStartDatesByType
+     */
+    public function testGetStartDatesByType(
+        string $type,
+        \DateTimeImmutable $dateTime,
+        \DateTimeInterface $expectedDateTime
+    ): void {
+        $startDateTime = DailyPageHelper::getStartDateTimeByType($type, $dateTime);
+
+        static::assertEquals($expectedDateTime, $startDateTime);
+    }
+
+    public function testGetStartDatesByTypeExceptionUnknownType(): void
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('Unsupported daily format type');
+
+        DailyPageHelper::getStartDateTimeByType('nope', new \DateTimeImmutable());
+    }
+
+    /**
+     * @dataProvider getEndDatesByType
+     */
+    public function testGetEndDatesByType(
+        string $type,
+        \DateTimeImmutable $dateTime,
+        \DateTimeInterface $expectedDateTime
+    ): void {
+        $endDateTime = DailyPageHelper::getEndDateTimeByType($type, $dateTime);
+
+        static::assertEquals($expectedDateTime, $endDateTime);
+    }
+
+    public function testGetEndDatesByTypeExceptionUnknownType(): void
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('Unsupported daily format type');
+
+        DailyPageHelper::getEndDateTimeByType('nope', new \DateTimeImmutable());
+    }
+
+    /**
+     * @dataProvider getDescriptionsByType
+     */
+    public function testGeDescriptionsByType(
+        string $type,
+        \DateTimeImmutable $dateTime,
+        string $expectedDescription
+    ): void {
+        $description = DailyPageHelper::getDescriptionByType($type, $dateTime);
+
+        static::assertEquals($expectedDescription, $description);
+    }
+
+    public function getDescriptionByTypeExceptionUnknownType(): void
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('Unsupported daily format type');
+
+        DailyPageHelper::getDescriptionByType('nope', new \DateTimeImmutable());
+    }
+
+    /**
+     * @dataProvider getRssLengthsByType
+     */
+    public function testGeRssLengthsByType(string $type): void {
+        $length = DailyPageHelper::getRssLengthByType($type);
+
+        static::assertIsInt($length);
+    }
+
+    public function testGeRssLengthsByTypeExceptionUnknownType(): void
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('Unsupported daily format type');
+
+        DailyPageHelper::getRssLengthByType('nope');
+    }
+
+    /**
+     * Data provider for testExtractRequestedType() test method.
+     */
+    public function getRequestedTypes(): array
+    {
+        return [
+            [['month' => null], DailyPageHelper::DAY],
+            [['month' => ''], DailyPageHelper::MONTH],
+            [['month' => 'content'], DailyPageHelper::MONTH],
+            [['week' => null], DailyPageHelper::DAY],
+            [['week' => ''], DailyPageHelper::WEEK],
+            [['week' => 'content'], DailyPageHelper::WEEK],
+            [['day' => null], DailyPageHelper::DAY],
+            [['day' => ''], DailyPageHelper::DAY],
+            [['day' => 'content'], DailyPageHelper::DAY],
+        ];
+    }
+
+    /**
+     * Data provider for testExtractRequestedDateTime() test method.
+     */
+    public function getRequestedDateTimes(): array
+    {
+        return [
+            [DailyPageHelper::DAY, '20201013', null, new \DateTime('2020-10-13')],
+            [
+                DailyPageHelper::DAY,
+                '',
+                (new Bookmark())->setCreated($date = new \DateTime('2020-10-13 12:05:31')),
+                $date,
+            ],
+            [DailyPageHelper::DAY, '', null, new \DateTime()],
+            [DailyPageHelper::WEEK, '202030', null, new \DateTime('2020-07-20')],
+            [
+                DailyPageHelper::WEEK,
+                '',
+                (new Bookmark())->setCreated($date = new \DateTime('2020-10-13 12:05:31')),
+                new \DateTime('2020-10-13'),
+            ],
+            [DailyPageHelper::WEEK, '', null, new \DateTime(), 'Ym'],
+            [DailyPageHelper::MONTH, '202008', null, new \DateTime('2020-08-01'), 'Ym'],
+            [
+                DailyPageHelper::MONTH,
+                '',
+                (new Bookmark())->setCreated($date = new \DateTime('2020-10-13 12:05:31')),
+                new \DateTime('2020-10-13'),
+                'Ym'
+            ],
+            [DailyPageHelper::MONTH, '', null, new \DateTime(), 'Ym'],
+        ];
+    }
+
+    /**
+     * Data provider for testGetFormatByType() test method.
+     */
+    public function getFormatsByType(): array
+    {
+        return [
+            [DailyPageHelper::DAY, 'Ymd'],
+            [DailyPageHelper::WEEK, 'YW'],
+            [DailyPageHelper::MONTH, 'Ym'],
+        ];
+    }
+
+    /**
+     * Data provider for testGetStartDatesByType() test method.
+     */
+    public function getStartDatesByType(): array
+    {
+        return [
+            [DailyPageHelper::DAY, new \DateTimeImmutable('2020-10-09 04:05:06'), new \DateTime('2020-10-09 00:00:00')],
+            [DailyPageHelper::WEEK, new \DateTimeImmutable('2020-10-09 04:05:06'), new \DateTime('2020-10-05 00:00:00')],
+            [DailyPageHelper::MONTH, new \DateTimeImmutable('2020-10-09 04:05:06'), new \DateTime('2020-10-01 00:00:00')],
+        ];
+    }
+
+    /**
+     * Data provider for testGetEndDatesByType() test method.
+     */
+    public function getEndDatesByType(): array
+    {
+        return [
+            [DailyPageHelper::DAY, new \DateTimeImmutable('2020-10-09 04:05:06'), new \DateTime('2020-10-09 23:59:59')],
+            [DailyPageHelper::WEEK, new \DateTimeImmutable('2020-10-09 04:05:06'), new \DateTime('2020-10-11 23:59:59')],
+            [DailyPageHelper::MONTH, new \DateTimeImmutable('2020-10-09 04:05:06'), new \DateTime('2020-10-31 23:59:59')],
+        ];
+    }
+
+    /**
+     * Data provider for testGetDescriptionsByType() test method.
+     */
+    public function getDescriptionsByType(): array
+    {
+        return [
+            [DailyPageHelper::DAY, $date = new \DateTimeImmutable(), 'Today - ' . $date->format('F j, Y')],
+            [DailyPageHelper::DAY, $date = new \DateTimeImmutable('-1 day'), 'Yesterday - ' . $date->format('F j, Y')],
+            [DailyPageHelper::DAY, new \DateTimeImmutable('2020-10-09 04:05:06'), 'October 9, 2020'],
+            [DailyPageHelper::WEEK, new \DateTimeImmutable('2020-10-09 04:05:06'), 'Week 41 (October 5, 2020)'],
+            [DailyPageHelper::MONTH, new \DateTimeImmutable('2020-10-09 04:05:06'), 'October, 2020'],
+        ];
+    }
+
+    /**
+     * Data provider for testGetDescriptionsByType() test method.
+     */
+    public function getRssLengthsByType(): array
+    {
+        return [
+            [DailyPageHelper::DAY],
+            [DailyPageHelper::WEEK],
+            [DailyPageHelper::MONTH],
+        ];
+    }
+}
diff --git a/tests/helper/FileUtilsTest.php b/tests/helper/FileUtilsTest.php
new file mode 100644
index 00000000..8035f79c
--- /dev/null
+++ b/tests/helper/FileUtilsTest.php
@@ -0,0 +1,197 @@
+<?php
+
+namespace Shaarli\Helper;
+
+use Exception;
+use Shaarli\Exceptions\IOException;
+use Shaarli\TestCase;
+
+/**
+ * Class FileUtilsTest
+ *
+ * Test file utility class.
+ */
+class FileUtilsTest extends TestCase
+{
+    /**
+     * @var string Test file path.
+     */
+    protected static $file = 'sandbox/flat.db';
+
+    protected function setUp(): void
+    {
+        @mkdir('sandbox');
+        mkdir('sandbox/folder2');
+        touch('sandbox/file1');
+        touch('sandbox/file2');
+        mkdir('sandbox/folder1');
+        touch('sandbox/folder1/file1');
+        touch('sandbox/folder1/file2');
+        mkdir('sandbox/folder3');
+        mkdir('/tmp/shaarli-to-delete');
+    }
+
+    /**
+     * Delete test file after every test.
+     */
+    protected function tearDown(): void
+    {
+        @unlink(self::$file);
+
+        @unlink('sandbox/folder1/file1');
+        @unlink('sandbox/folder1/file2');
+        @rmdir('sandbox/folder1');
+        @unlink('sandbox/file1');
+        @unlink('sandbox/file2');
+        @rmdir('sandbox/folder2');
+        @rmdir('sandbox/folder3');
+        @rmdir('/tmp/shaarli-to-delete');
+    }
+
+    /**
+     * Test writeDB, then readDB with different data.
+     */
+    public function testSimpleWriteRead()
+    {
+        $data = ['blue', 'red'];
+        $this->assertTrue(FileUtils::writeFlatDB(self::$file, $data) > 0);
+        $this->assertTrue(startsWith(file_get_contents(self::$file), '<?php /*'));
+        $this->assertEquals($data, FileUtils::readFlatDB(self::$file));
+
+        $data = 0;
+        $this->assertTrue(FileUtils::writeFlatDB(self::$file, $data) > 0);
+        $this->assertEquals($data, FileUtils::readFlatDB(self::$file));
+
+        $data = null;
+        $this->assertTrue(FileUtils::writeFlatDB(self::$file, $data) > 0);
+        $this->assertEquals($data, FileUtils::readFlatDB(self::$file));
+
+        $data = false;
+        $this->assertTrue(FileUtils::writeFlatDB(self::$file, $data) > 0);
+        $this->assertEquals($data, FileUtils::readFlatDB(self::$file));
+    }
+
+    /**
+     * File not writable: raise an exception.
+     */
+    public function testWriteWithoutPermission()
+    {
+        $this->expectException(\Shaarli\Exceptions\IOException::class);
+        $this->expectExceptionMessage('Error accessing "sandbox/flat.db"');
+
+        touch(self::$file);
+        chmod(self::$file, 0440);
+        FileUtils::writeFlatDB(self::$file, null);
+    }
+
+    /**
+     * Folder non existent: raise an exception.
+     */
+    public function testWriteFolderDoesNotExist()
+    {
+        $this->expectException(\Shaarli\Exceptions\IOException::class);
+        $this->expectExceptionMessage('Error accessing "nopefolder"');
+
+        FileUtils::writeFlatDB('nopefolder/file', null);
+    }
+
+    /**
+     * Folder non writable: raise an exception.
+     */
+    public function testWriteFolderPermission()
+    {
+        $this->expectException(\Shaarli\Exceptions\IOException::class);
+        $this->expectExceptionMessage('Error accessing "sandbox"');
+
+        chmod(dirname(self::$file), 0555);
+        try {
+            FileUtils::writeFlatDB(self::$file, null);
+        } catch (Exception $e) {
+            chmod(dirname(self::$file), 0755);
+            throw $e;
+        }
+    }
+
+    /**
+     * Read non existent file, use default parameter.
+     */
+    public function testReadNotExistentFile()
+    {
+        $this->assertEquals(null, FileUtils::readFlatDB(self::$file));
+        $this->assertEquals(['test'], FileUtils::readFlatDB(self::$file, ['test']));
+    }
+
+    /**
+     * Read non readable file, use default parameter.
+     */
+    public function testReadNotReadable()
+    {
+        touch(self::$file);
+        chmod(self::$file, 0220);
+        $this->assertEquals(null, FileUtils::readFlatDB(self::$file));
+        $this->assertEquals(['test'], FileUtils::readFlatDB(self::$file, ['test']));
+    }
+
+    /**
+     * Test clearFolder with self delete and excluded files
+     */
+    public function testClearFolderSelfDeleteWithExclusion(): void
+    {
+        FileUtils::clearFolder('sandbox', true, ['file2']);
+
+        static::assertFileExists('sandbox/folder1/file2');
+        static::assertFileExists('sandbox/folder1');
+        static::assertFileExists('sandbox/file2');
+        static::assertFileExists('sandbox');
+
+        static::assertFileNotExists('sandbox/folder1/file1');
+        static::assertFileNotExists('sandbox/file1');
+        static::assertFileNotExists('sandbox/folder3');
+    }
+
+    /**
+     * Test clearFolder with self delete and excluded files
+     */
+    public function testClearFolderSelfDeleteWithoutExclusion(): void
+    {
+        FileUtils::clearFolder('sandbox', true);
+
+        static::assertFileNotExists('sandbox');
+    }
+
+    /**
+     * Test clearFolder with self delete and excluded files
+     */
+    public function testClearFolderNoSelfDeleteWithoutExclusion(): void
+    {
+        FileUtils::clearFolder('sandbox', false);
+
+        static::assertFileExists('sandbox');
+
+        // 2 because '.' and '..'
+        static::assertCount(2, new \DirectoryIterator('sandbox'));
+    }
+
+    /**
+     * Test clearFolder on a file instead of a folder
+     */
+    public function testClearFolderOnANonDirectory(): void
+    {
+        $this->expectException(IOException::class);
+        $this->expectExceptionMessage('Provided path is not a directory.');
+
+        FileUtils::clearFolder('sandbox/file1', false);
+    }
+
+    /**
+     * Test clearFolder on a file instead of a folder
+     */
+    public function testClearFolderOutsideOfShaarliDirectory(): void
+    {
+        $this->expectException(IOException::class);
+        $this->expectExceptionMessage('Trying to delete a folder outside of Shaarli path.');
+
+
+        FileUtils::clearFolder('/tmp/shaarli-to-delete', true);
+    }
+}