diff --git a/tests/Unit/Utilities/FormatterTest.php b/tests/Unit/Utilities/FormatterTest.php
new file mode 100644
index 0000000..dd9f0a2
--- /dev/null
+++ b/tests/Unit/Utilities/FormatterTest.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Tests\Unit\Utilities;
+
+use App\Utilities\Formatter;
+use Tests\TestCase;
+
+class FormatterTest extends TestCase
+{
+    public function testNormalizeUrlWithoutQuery()
+    {
+        $formatter = new Formatter();
+
+        $url = 'http://example.com/path/to';
+        $this->assertEquals($url, $formatter->normalizeUrl($url));
+    }
+
+    public function testNormalizeUrlWithSortedQuery()
+    {
+        $formatter = new Formatter();
+
+        $url = 'http://example.com/path/to?foo=bar&hoge=fuga';
+        $this->assertEquals($url, $formatter->normalizeUrl($url));
+    }
+
+    public function testNormalizeUrlWithUnsortedQuery()
+    {
+        $formatter = new Formatter();
+
+        $url = 'http://example.com/path/to?hoge=fuga&foo=bar';
+        $this->assertEquals('http://example.com/path/to?foo=bar&hoge=fuga', $formatter->normalizeUrl($url));
+    }
+
+    public function testNormalizeUrlWithSortedQueryAndFragment()
+    {
+        $formatter = new Formatter();
+
+        $url = 'http://example.com/path/to?foo=bar&hoge=fuga#fragment';
+        $this->assertEquals($url, $formatter->normalizeUrl($url));
+    }
+
+    public function testNormalizeUrlWithFragment()
+    {
+        $formatter = new Formatter();
+
+        $url = 'http://example.com/path/to#fragment';
+        $this->assertEquals($url, $formatter->normalizeUrl($url));
+    }
+
+    public function testNormalizeUrlWithSortedQueryAndZeroLengthFragment()
+    {
+        $formatter = new Formatter();
+
+        $url = 'http://example.com/path/to?foo=bar&hoge=fuga#';
+        $this->assertEquals('http://example.com/path/to?foo=bar&hoge=fuga', $formatter->normalizeUrl($url));
+    }
+}
\ No newline at end of file