diff --git a/aoc2021.test/DayTests.cs b/aoc2021.test/DayTests.cs
index 4c8e295..3bc1d84 100644
--- a/aoc2021.test/DayTests.cs
+++ b/aoc2021.test/DayTests.cs
@@ -11,6 +11,8 @@ public class DayTests
         var day = Activator.CreateInstance(dayType) as Day;
         s.Stop();
         Assert.IsNotNull(day, "failed to instantiate day object");
+        Assert.IsTrue(File.Exists(day.FileName));
+        Console.Write($"Day {day.DayNumber}: {day.PuzzleName,-15} ");
         Console.WriteLine($"{s.ScaleMilliseconds()} ms elapsed in constructor");
 
         // part 1
@@ -18,7 +20,8 @@ public class DayTests
         s.Start();
         var part1Actual = day.Part1();
         s.Stop();
-        Console.WriteLine($"{s.ScaleMilliseconds()} ms elapsed in part1");
+        Console.Write($"Part1: {part1Actual,-15} ");
+        Console.WriteLine($"{s.ScaleMilliseconds()} ms elapsed");
         Assert.AreEqual(part1, part1Actual, $"Incorrect answer for Day {day.DayNumber} Part1");
 
         // part 2
@@ -26,7 +29,40 @@ public class DayTests
         s.Start();
         var part2Actual = day.Part2();
         s.Stop();
-        Console.WriteLine($"{s.ScaleMilliseconds()} ms elapsed in part2");
+        Console.Write($"Part2: {part2Actual,-15} ");
+        Console.WriteLine($"{s.ScaleMilliseconds()} ms elapsed");
+        Assert.AreEqual(part2, part2Actual, $"Incorrect answer for Day {day.DayNumber} Part2");
+    }
+    
+    [DataTestMethod]
+    [DataRow(typeof(Day01), "7", "5")]
+    public void CheckTestInputs(Type dayType, string part1, string part2)
+    {
+        Day.UseTestInput = true;
+        var s = Stopwatch.StartNew();
+        var day = Activator.CreateInstance(dayType) as Day;
+        s.Stop();
+        Assert.IsNotNull(day, "failed to instantiate day object");
+        Assert.IsTrue(File.Exists(day.FileName));
+        Console.Write($"Day {day.DayNumber}: {day.PuzzleName,-15} ");
+        Console.WriteLine($"{s.ScaleMilliseconds()} ms elapsed in constructor");
+
+        // part 1
+        s.Reset();
+        s.Start();
+        var part1Actual = day.Part1();
+        s.Stop();
+        Console.Write($"Part1: {part1Actual,-15} ");
+        Console.WriteLine($"{s.ScaleMilliseconds()} ms elapsed");
+        Assert.AreEqual(part1, part1Actual, $"Incorrect answer for Day {day.DayNumber} Part1");
+
+        // part 2
+        s.Reset();
+        s.Start();
+        var part2Actual = day.Part2();
+        s.Stop();
+        Console.Write($"Part2: {part2Actual,-15} ");
+        Console.WriteLine($"{s.ScaleMilliseconds()} ms elapsed");
         Assert.AreEqual(part2, part2Actual, $"Incorrect answer for Day {day.DayNumber} Part2");
     }
 }
diff --git a/aoc2021/Day.cs b/aoc2021/Day.cs
index e7d1c69..e99eac7 100644
--- a/aoc2021/Day.cs
+++ b/aoc2021/Day.cs
@@ -8,14 +8,17 @@ public abstract class Day
         PuzzleName = puzzleName;
     }
 
+    public static bool UseTestInput { get; set; }
+
     public int DayNumber { get; }
     public string PuzzleName { get; }
 
     protected IEnumerable<string> Input =>
         File.ReadLines(FileName);
 
-    protected string FileName =>
-        Path.Combine(AppDomain.CurrentDomain.BaseDirectory, $"input/day{DayNumber,2:00}.in");
+    public string FileName =>
+        Path.Combine(AppDomain.CurrentDomain.BaseDirectory,
+            $"input/{(UseTestInput ? "test" : "day")}{DayNumber,2:00}.in");
 
     public abstract string Part1();
     public abstract string Part2();
diff --git a/aoc2021/Day01.cs b/aoc2021/Day01.cs
index 8729404..fcd352e 100644
--- a/aoc2021/Day01.cs
+++ b/aoc2021/Day01.cs
@@ -27,9 +27,7 @@ public sealed class Day01 : Day
         var c = 0;
         for (var i = 0; i < _readings.Count - 3; i++)
         {
-            var prev = _readings[i] + _readings[i + 1] + _readings[i + 2];
-            var curr = _readings[i + 1] + _readings[i + 2] + _readings[i + 3];
-            if (curr > prev) c++;
+            if (_readings[i + 3] > _readings[i]) c++;
         }
         return $"{c}";
     }
diff --git a/aoc2021/aoc2021.csproj b/aoc2021/aoc2021.csproj
index 6e7a363..395175a 100644
--- a/aoc2021/aoc2021.csproj
+++ b/aoc2021/aoc2021.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <None Update="input\day*.in">
+    <None Update="input\*.in">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
   </ItemGroup>
diff --git a/aoc2021/input/test01.in b/aoc2021/input/test01.in
new file mode 100644
index 0000000..26713c4
--- /dev/null
+++ b/aoc2021/input/test01.in
@@ -0,0 +1,10 @@
+199
+200
+208
+210
+200
+207
+240
+269
+260
+263
\ No newline at end of file