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diff --git a/apps/theming/tests/lib/UtilTest.php b/apps/theming/tests/lib/UtilTest.php
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+<?php
+/**
+ * @copyright Copyright (c) 2016 Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OCA\Theming\Tests;
+
+use OCA\Theming\Util;
+use Test\TestCase;
+
+class UtilTest extends TestCase {
+
+	public function testInvertTextColorLight() {
+		$invert = Util::invertTextColor('#ffffff');
+		$this->assertEquals(true, $invert);
+	}
+
+	public function testInvertTextColorDark() {
+		$invert = Util::invertTextColor('#000000');
+		$this->assertEquals(false, $invert);
+	}
+
+	public function testCalculateLuminanceLight() {
+		$luminance = Util::calculateLuminance('#ffffff');
+		$this->assertEquals(1, $luminance);
+	}
+
+	public function testCalculateLuminanceDark() {
+		$luminance = Util::calculateLuminance('#000000');
+		$this->assertEquals(0, $luminance);
+	}
+
+	public function testCalculateLuminanceLightShorthand() {
+		$luminance = Util::calculateLuminance('#fff');
+		$this->assertEquals(1, $luminance);
+	}
+
+	public function testCalculateLuminanceDarkShorthand() {
+		$luminance = Util::calculateLuminance('#000');
+		$this->assertEquals(0, $luminance);
+	}
+	public function testInvertTextColorInvalid() {
+		$invert = Util::invertTextColor('aaabbbcccddd123');
+		$this->assertEquals(false, $invert);
+	}
+	
+	public function testInvertTextColorEmpty() {
+		$invert = Util::invertTextColor('');
+		$this->assertEquals(false, $invert);
+	}
+}