朝時間範囲の検証テストを追加した [FAIL]

tests/MorningTimeRangeTest.php

@@ -0,0 +1,40 @@
+<?php
+namespace Hg\Greeter;
+
+use PHPUnit\Framework\TestCase;
+
+class MorningTimeRangeTest extends TestCase
+{
+    /**
+     * @var MorningTimeRange
+     */
+    private $SUT;
+
+    /**
+     * @test
+     * @dataProvider 時間帯テストデータ
+     */
+    public function 時間帯に含むかどうか($target, $expected)
+    {
+        $this->assertThat(
+            $this->SUT->contains(new \DateTimeImmutable($target)),
+            $this->equalTo($expected)
+        );
+    }
+
+    public function 時間帯テストデータ()
+    {
+        return [
+            ['04:00:00', false],
+            ['05:00:00', true],
+            ['10:00:00', true],
+            ['12:00:00', false],
+            ['20:00:00', false],
+        ];
+    }
+
+    protected function setUp()
+    {
+        $this->SUT = new MorningTimeRange();
+    }
+}