Cleaned up Day1Solution and added unit tests for Day1Solution.

AoC2018/Solutions/Day1Solution.cs

@@ -16,38 +16,47 @@ namespace AoC2018.Solutions
         public override void Run()
         {
             string[] input = File.ReadAllLines(Path.Combine("Input", "Day1Input.txt"));
-            Dictionary<int, int> frequencyOccurrences = new Dictionary<int, int>();
-            int part1Result = 0, part2Result = 0;
-            bool part2Flag = false;
+
+            Console.WriteLine($"Part 1 Result: {CalculatePart1(input)}");
+            Console.WriteLine($"Part 2 Result: {CalculatePart2(input)}");
+        }
+
+        public int CalculatePart1(string[] input)
+        {
+            int sum = 0;
 
             for (var i = 0; i < input.Length; i++)
-            {
-                part1Result += int.Parse(input[i]);
-            }
-            Console.WriteLine($"Part 1 Result: {part1Result}");
+                sum += int.Parse(input[i]);
 
-            part1Result = 0;
-            while (!part2Flag)
+            return sum;
+        }
+
+        public int CalculatePart2(string[] input)
+        {
+            Dictionary<int, int> frequencyOccurrences = new Dictionary<int, int>();
+            int sum = 0, result = 0;
+            bool foundResult = false;
+
+            frequencyOccurrences.Add(0, 1);
+            while (!foundResult)
             {
-                for (var i = 0; i < input.Length; i++)
+                foreach (var s in input)
                 {
-                    part1Result += int.Parse(input[i]);
+                    sum += int.Parse(s);
 
-                    if (!frequencyOccurrences.ContainsKey(part1Result))
-                        frequencyOccurrences.Add(part1Result, 0);
+                    if (!frequencyOccurrences.ContainsKey(sum))
+                        frequencyOccurrences.Add(sum, 0);
 
-                    frequencyOccurrences[part1Result]++;
-
-                    if (frequencyOccurrences[part1Result] > 1)
+                    if (++frequencyOccurrences[sum] > 1)
                     {
-                        part2Flag = true;
-                        part2Result = part1Result;
+                        foundResult = true;
+                        result = sum;
                         break;
                     }
                 }
             }
 
-            Console.WriteLine($"Part 2 Result: {part2Result}");
+            return result;
         }
     }
 }

AoC2018Test/AoC2018Test.csproj

@@ -14,4 +14,8 @@
     <ProjectReference Include="..\AoC2018\AoC2018.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" />
+  </ItemGroup>
+
 </Project>

AoC2018Test/Solutions/Day1SolutionTests.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using AoC2018.Solutions;
+
+namespace AoC2018Test.Solutions
+{
+    [TestClass]
+    public class Day1SolutionTests
+    {
+        [TestMethod]
+        public void TestPart1()
+        {
+            Day1Solution target = new Day1Solution();
+
+            // Example 1
+            var result = target.CalculatePart1(new string[]
+            {
+                "+1", "+1", "+1"
+            });
+            Assert.AreEqual(3, result);
+
+            // Example 2
+            result = target.CalculatePart1(new string[]
+            {
+                "+1", "+1", "-2"
+            });
+            Assert.AreEqual(0, result);
+
+            // Example 3
+            result = target.CalculatePart1(new string[]
+            {
+                "-1", "-2", "-3"
+            });
+            Assert.AreEqual(-6, result);
+        }
+
+        [TestMethod]
+        public void TestPart2()
+        {
+            Day1Solution target = new Day1Solution();
+
+            // Example 1
+            var result = target.CalculatePart2(new string[]
+            {
+                "+1", "-1"
+            });
+            Assert.AreEqual(0, result);
+
+            // Example 2
+            result = target.CalculatePart2(new string[]
+            {
+                "+3", "+3", "+4", "-2", "-4"
+            });
+            Assert.AreEqual(10, result);
+
+            // Example 3
+            result = target.CalculatePart2(new string[]
+            {
+                "-6", "+3", "+8", "+5", "-6"
+            });
+            Assert.AreEqual(5, result);
+
+            // Example 4
+            result = target.CalculatePart2(new string[]
+            {
+                "+7", "+7", "-2", "-7", "-4"
+            });
+            Assert.AreEqual(14, result);
+        }
+    }
+}

AoC2018Test/UnitTest1.cs

@@ -1,14 +0,0 @@
-using System;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-
-namespace AoC2018Test
-{
-    [TestClass]
-    public class UnitTest1
-    {
-        [TestMethod]
-        public void TestMethod1()
-        {
-        }
-    }
-}