Migrate tests to XUnit

AdventOfCode2018.Tests/Day09_Tests.cs

@@ -1,68 +1,67 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Xunit;
 
 namespace AdventOfCode2018.Tests
 {
-    [TestClass]
     public class Day09_Tests
     {
-        [TestMethod]
+        [Fact]
         public void ResolvePart1__Test1()
         {
             Day09 day = new Day09();
 
             string result = day.ResolvePart1(new string[] { "9 players; last marble is worth 25 points" });
 
-            Assert.AreEqual("32", result);
+            Assert.Equal("32", result);
         }
 
-        [TestMethod]
+        [Fact]
         public void ResolvePart1__Test2()
         {
             Day09 day = new Day09();
 
             string result = day.ResolvePart1(new string[] { "10 players; last marble is worth 1618 points" });
 
-            Assert.AreEqual("8317", result);
+            Assert.Equal("8317", result);
         }
 
-        [TestMethod]
+        [Fact]
         public void ResolvePart1__Test3()
         {
             Day09 day = new Day09();
 
             string result = day.ResolvePart1(new string[] { "13 players; last marble is worth 7999 points" });
 
-            Assert.AreEqual("146373", result);
+            Assert.Equal("146373", result);
         }
 
-        [TestMethod]
+        [Fact]
         public void ResolvePart1__Test4()
         {
             Day09 day = new Day09();
 
             string result = day.ResolvePart1(new string[] { "17 players; last marble is worth 1104 points" });
 
-            Assert.AreEqual("2764", result);
+            Assert.Equal("2764", result);
         }
 
-        [TestMethod]
+        [Fact]
         public void ResolvePart1__Test5()
         {
             Day09 day = new Day09();
 
             string result = day.ResolvePart1(new string[] { "21 players; last marble is worth 6111 points" });
 
-            Assert.AreEqual("54718", result);
+            Assert.Equal("54718", result);
         }
 
-        [TestMethod]
+        [Fact]
         public void ResolvePart1__Test6()
         {
             Day09 day = new Day09();
 
             string result = day.ResolvePart1(new string[] { "30 players; last marble is worth 5807 points" });
 
-            Assert.AreEqual("37305", result);
+            Assert.Equal("37305", result);
         }
     }
 }