1 files changed, 7 insertions, 0 deletions
diff --git a/tests/MathTest.php b/tests/MathTest.php
index 3e5a7ff..1ffa5ae 100644
--- a/tests/MathTest.php
+++ b/tests/MathTest.php
@@ -304,4 +304,11 @@ class MathTest extends \PHPUnit\Framework\TestCase
         $this->assertEquals(-4, $calculator->execute('(-4)'));
         $this->assertEquals(1, $calculator->execute('(-4 + 5)'));
     }
+
+    public function testMinusZero()
+    {
+        $calculator = new MathExecutor();
+        $this->assertEquals(1, $calculator->execute('1 - 0'));
+        $this->assertEquals(1, $calculator->execute('1-0'));
+    }
 }