From f3d19bc9bcaecfae55aba7692542a4d644c5f23d Mon Sep 17 00:00:00 2001
From: mouson <mouson@gmail.com>
Date: Tue, 10 Jan 2017 04:01:07 +0800
Subject: [PATCH] =?UTF-8?q?Issue=20#1=20=E5=A2=9E=E5=8A=A0=E8=B2=A0?=
 =?UTF-8?q?=E6=95=B8=E6=B8=AC=E8=A9=A6=E6=A1=88=E4=BE=8B?=
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---
 .../DoubleSequenceCalculatorTest.php              | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tests/Mouson/Helpers/SequenceCalculator/DoubleSequenceCalculatorTest.php b/tests/Mouson/Helpers/SequenceCalculator/DoubleSequenceCalculatorTest.php
index a9de5e2..9f60c68 100644
--- a/tests/Mouson/Helpers/SequenceCalculator/DoubleSequenceCalculatorTest.php
+++ b/tests/Mouson/Helpers/SequenceCalculator/DoubleSequenceCalculatorTest.php
@@ -47,4 +47,19 @@ public function test_測試雙倍數列輸入2應回傳4()
         /** Assert */
         $this->assertEquals($expected, $actual);
     }
+
+    public function test_測試雙倍數列輸入負數應回傳兩倍負數()
+    {
+        /** Arrange */
+        $target = new DoubleSequenceCalculator();
+        $value  = -2;
+        /** Assume */
+        $expected = -4;
+
+        /** Act */
+        $actual = $target->calculate($value);
+
+        /** Assert */
+        $this->assertEquals($expected, $actual);
+    }
 }