#33 Fix NullReferenceException with test

Author: justcoding121

src/Advanced.Algorithms/Geometry/BentleyOttmann.cs

@@ -10,7 +10,6 @@ namespace Advanced.Algorithms.Geometry
     /// </summary>
     public class BentleyOttmann
     {
-        private readonly int precision;
         private readonly PointComparer pointComparer;
 
         private HashSet<Event> verticalHorizontalLines;
@@ -30,7 +29,6 @@ public class BentleyOttmann
 
         public BentleyOttmann(int precision = 5)
         {
-            this.precision = precision;
             pointComparer = new PointComparer();
 
             Tolerance = Math.Round(Math.Pow(0.1, precision), precision);
@@ -64,7 +62,7 @@ private void initialize(IEnumerable<Line> lineSegments)
             eventQueueLookUp = new HashSet<Event>(rightLeftEventLookUp.SelectMany(x => new[] {
                                     x.Key,
                                     x.Value
-                                }), new PointComparer());
+                                }));
 
             eventQueue = new BHeap<Event>(SortDirection.Ascending, eventQueueLookUp, new EventQueueComparer());
         }

tests/Advanced.Algorithms.Tests/Geometry/BentleyOttmann_Tests.cs

@@ -11,7 +11,7 @@ namespace Advanced.Algorithms.Tests.Geometry
     public class BentleyOttmann_Tests
     {
         [TestMethod]
-        public void BentleyOttmann_Smoke_Test()
+        public void BentleyOttmann_Smoke_Test_1()
         {
             var lines = new List<Line>();
 
@@ -31,6 +31,26 @@ public void BentleyOttmann_Smoke_Test()
             Assert.AreEqual(expectedIntersections.Count, actualIntersections.Count);
         }
 
+        [TestMethod]
+        public void BentleyOttmann_Smoke_Test_2()
+        {
+            var lines = new List<Line>();
+
+            var s1 = new Line(new Point(100, 0), new Point(150, 130));
+            var s2 = new Line(new Point(20, 80), new Point(80, 70));
+            var s3 = new Line(new Point(80, 70), new Point(50, 100));
+
+            lines.AddRange(new[] { s1, s2, s3 });
+
+            var expectedIntersections = getExpectedIntersections(lines);
+
+            var bentleyOttmannAlgorithm = new BentleyOttmann();
+
+            var actualIntersections = bentleyOttmannAlgorithm.FindIntersections(lines);
+
+            Assert.AreEqual(expectedIntersections.Count, actualIntersections.Count);
+        }
+
         [TestMethod]
         public void BentleyOttmann_Vertical_Lines_Test()
         {