diff --git a/.gitignore b/.gitignore
index 15fa182..60f39b5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,4 @@
 /.idea/
-/tests/
 /var/
 /vendor/
 
diff --git a/tests/FreeElephants/Jwt/FirebaseJwtAdapterTest.php b/tests/FreeElephants/Jwt/FirebaseJwtAdapterTest.php
new file mode 100644
index 0000000..3d12603
--- /dev/null
+++ b/tests/FreeElephants/Jwt/FirebaseJwtAdapterTest.php
@@ -0,0 +1,39 @@
+<?php
+
+
+namespace FreeElephants\Jwt;
+
+
+use FreeElephants\Jwt\Exception\InvalidArgumentException;
+use FreeElephants\Jwt\Exception\OutOfBoundsException;
+use PHPUnit\Framework\TestCase;
+
+class FirebaseJwtAdapterTest extends TestCase
+{
+
+    public function testDecode()
+    {
+        $decoder = new FirebaseJwtDecoderAdapter('example_key', ['HS256', 'HS384']);
+
+        $signature = 'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJhdXRoaWQiOiJqb2UiLCJhdXRocm9sZXMiOlsic3Vic2NyaWJlciJdfQ.Lxyy1H3gfs1FV5UJLGxfAYvS1TJeiJhVInu5GIlccg4';
+        $expected = new \stdClass();
+        $expected->authid = 'joe';
+        $expected->authroles = [
+            'subscriber'
+        ];
+
+        $this->assertEquals($expected, $decoder->decode($signature));
+    }
+
+    public function testUseEmptyAllowedAlgorithmsListInvalidArgumentException()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        new FirebaseJwtDecoderAdapter('example_key', []);
+    }
+
+    public function testSetAllowedAlgorithmsOutOfBoundsException()
+    {
+        $this->expectException(OutOfBoundsException::class);
+        new FirebaseJwtDecoderAdapter('example_key', ['foo bar']);
+    }
+}
\ No newline at end of file