diff --git a/AOC.Test/Test2015.cs b/AOC.Test/Test2015.cs
index aec4ef0..28c2fe3 100644
--- a/AOC.Test/Test2015.cs
+++ b/AOC.Test/Test2015.cs
@@ -15,6 +15,7 @@ public class Test2015
     }
 
     [DataTestMethod]
+    [DataRow(typeof(Day01), "-1", "5")]
     [DataRow(typeof(Day02), "58", "34")]
     [DataRow(typeof(Day03), "2", "11")]
     public void CheckTestInputs(Type dayType, string part1, string part2)
diff --git a/AOC2015/input2015/test01.in b/AOC2015/input2015/test01.in
new file mode 100644
index 0000000..4b58722
--- /dev/null
+++ b/AOC2015/input2015/test01.in
@@ -0,0 +1 @@
+()())