Tidy Day baseclass and add empty day4

aoc.tests/Day3Test.cs

@@ -26,4 +26,4 @@ namespace aoc.tests
             Assert.AreEqual("1718180100", _day3.Part2());
         }
     }
-}
+}

aoc.tests/Day4Test.cs

@@ -0,0 +1,29 @@
+using aoc2020;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace aoc.tests
+{
+    [TestClass]
+    public class Day4Test
+    {
+        private Day4 _day4;
+
+        [TestInitialize]
+        public void Initialize()
+        {
+            _day4 = new Day4();
+        }
+
+        [TestMethod]
+        public void TestPart1()
+        {
+            Assert.AreEqual("", _day4.Part1());
+        }
+
+        [TestMethod]
+        public void TestPart2()
+        {
+            Assert.AreEqual("", _day4.Part2());
+        }
+    }
+}

aoc2020/Day.cs

@@ -9,8 +9,8 @@ namespace aoc2020
     {
         public abstract int DayNumber { get; }
 
-        public virtual IEnumerable<string> Input =>
-            File.ReadLines($"input/day{DayNumber}.in");
+        protected virtual IEnumerable<string> Input =>
+            File.ReadLines(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, $"input/day{DayNumber}.in"));
 
         public abstract string Part1();
         public abstract string Part2();
@@ -20,33 +20,24 @@ namespace aoc2020
             Console.WriteLine($"Day {DayNumber}:");
             var s = new Stopwatch();
 
-            if (verbose) s.Start();
-
+            s.Start();
             var part1 = Part1();
-
-            if (verbose)
-            {
-                s.Stop();
-                Console.WriteLine($"Part 1 elapsed: {s.ElapsedMilliseconds}ms");
-            }
-
+            s.Stop();
             Console.WriteLine(part1);
 
             if (verbose)
-            {
-                s.Reset();
-                s.Start();
-            }
-
+                Console.WriteLine($"{s.ElapsedMilliseconds}ms elapsed");
+            
+            s.Reset();
+            
+            s.Start();
             var part2 = Part2();
+            s.Stop();
+            Console.WriteLine(part2);
 
             if (verbose)
-            {
-                s.Stop();
-                Console.WriteLine($"Part 2 elapsed: {s.ElapsedMilliseconds}ms");
-            }
+                Console.WriteLine($"{s.ElapsedMilliseconds}ms elapsed");
 
-            Console.WriteLine(part2);
             Console.WriteLine();
         }
     }

aoc2020/Day3.cs

@@ -32,19 +32,13 @@ namespace aoc2020
 
         public override string Part2()
         {
-            var slopes = new[]
-            {
-                (1, 1),
-                (3, 1),
-                (5, 1),
-                (7, 1),
-                (1, 2)
-            };
+            var xSlopes = new[] {1, 3, 5, 7, 1};
+            var ySlopes = new[] {1, 1, 1, 1, 2};
 
-            return slopes
+            return xSlopes.Zip(ySlopes)
                 .Select(s => CountSlope(s.Item1, s.Item2))
                 .Aggregate((acc, i) => acc * i)
                 .ToString();
         }
     }
-}
+}

aoc2020/Day4.cs

@@ -0,0 +1,17 @@
+namespace aoc2020
+{
+    public sealed class Day4 : Day
+    {
+        public override int DayNumber => 4;
+
+        public override string Part1()
+        {
+            return "";
+        }
+
+        public override string Part2()
+        {
+            return "";
+        }
+    }
+}