Merge commit, git oull origin master.

Author: aalhour

Algorithms/Algorithms.csproj

@@ -4,7 +4,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="xunit" Version="2.4.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
   </ItemGroup>
 
   <ItemGroup>

Algorithms/Graphs/BellmanFordShortestPaths.cs

@@ -35,21 +35,23 @@ public class BellmanFordShortestPaths<TGraph, TVertex>
         /// </summary>
         public BellmanFordShortestPaths(TGraph Graph, TVertex Source)
         {
-            if (Graph == null)
-                throw new ArgumentNullException();
-            if (!Graph.HasVertex(Source))
-                throw new ArgumentException("The source vertex doesn't belong to graph.");
+            if (Graph == null) {
+                throw new ArgumentNullException ();
+            } else {
+                if (!Graph.HasVertex (Source))
+                    throw new ArgumentException ("The source vertex doesn't belong to graph.");
 
-            // Init
-            _initializeDataMembers(Graph);
+                // Init
+                _initializeDataMembers (Graph);
 
-            // Traverse the graph
-            var status = _bellmanFord(Graph, Source);
+                // Traverse the graph
+                var status = _bellmanFord (Graph, Source);
 
-            if (status == false)
-                throw new Exception("Negative-weight cycle detected.");
+                if (status == false)
+                    throw new Exception ("Negative-weight cycle detected.");
 
-            Debug.Assert(_checkOptimalityConditions(Graph, Source));
+                Debug.Assert (_checkOptimalityConditions (Graph, Source));
+            }
         }
 
 

DataStructures/DataStructures.csproj

@@ -4,7 +4,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="xunit" Version="2.4.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
   </ItemGroup>
 
   <ItemGroup>

UnitTest/DataStructuresTests/HashTableSeparateChainingTest.cs

@@ -101,7 +101,11 @@ public static void DoTest()
             Assert.True(studentsMarks.Count == 3);
 
             KeyValuePair<string, int>[] array = new KeyValuePair<string, int>[studentsMarks.Count];
-            studentsMarks.CopyTo(array, 0);
+        
+            if (studentsMarks != null)
+            {
+                studentsMarks.CopyTo(array, 0);
+            }
 
             Assert.True(array.Length == studentsMarks.Count);
         }

UnitTest/UnitTest.csproj

@@ -5,9 +5,9 @@
 
   <ItemGroup>
     <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
-    <PackageReference Include="xunit" Version="2.4.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
   </ItemGroup>
 
   <ItemGroup>