diff --git a/tests/FormatImplementationTest.php b/tests/FormatImplementationTest.php
new file mode 100644
index 00000000..f2df6350
--- /dev/null
+++ b/tests/FormatImplementationTest.php
@@ -0,0 +1,44 @@
+<?php
+require_once __DIR__ . '/../lib/rssbridge.php';
+
+use PHPUnit\Framework\TestCase;
+
+class FormatImplementationTest extends TestCase {
+	private $class;
+	private $obj;
+
+	/**
+	 * @dataProvider dataFormatsProvider
+	 */
+	public function testClassName($path) {
+		$this->setFormat($path);
+		$this->assertTrue($this->class === ucfirst($this->class), 'class name must start with uppercase character');
+		$this->assertEquals(0, substr_count($this->class, ' '), 'class name must not contain spaces');
+		$this->assertStringEndsWith('Format', $this->class, 'class name must end with "Format"');
+	}
+
+	/**
+	 * @dataProvider dataFormatsProvider
+	 */
+	public function testClassType($path) {
+		$this->setFormat($path);
+		$this->assertInstanceOf(FormatInterface::class, $this->obj);
+	}
+
+	////////////////////////////////////////////////////////////////////////////
+
+	public function dataFormatsProvider() {
+		$formats = array();
+		foreach (glob(PATH_LIB_FORMATS . '*.php') as $path) {
+			$formats[basename($path, '.php')] = array($path);
+		}
+		return $formats;
+	}
+
+	private function setFormat($path) {
+		require_once $path;
+		$this->class = basename($path, '.php');
+		$this->assertTrue(class_exists($this->class), 'class ' . $this->class . ' doesn\'t exist');
+		$this->obj = new $this->class();
+	}
+}