chore: add GlobalUsings.cs with project-wide using directives in data structures tests

Author: KaranChadha10

DataStructures.Tests/AATreeTests.cs

@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using DataStructures.AATree;
-using FluentAssertions;
-using NUnit.Framework;
 
 namespace DataStructures.Tests;
 

DataStructures.Tests/AVLTreeTests.cs

@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using DataStructures.AVLTree;
-using FluentAssertions;
-using NUnit.Framework;
 using static FluentAssertions.FluentActions;
 
 namespace DataStructures.Tests;
@@ -233,19 +228,19 @@ public void Remove_MultipleKeys_TreeStillValid_Variant2()
         tree.GetKeysInOrder()
             .Should()
             .BeEquivalentTo(
-                new[] { 4,6,8 },
+                new[] { 4, 6, 8 },
                 config => config.WithStrictOrdering());
 
         tree.GetKeysPreOrder()
             .Should()
             .BeEquivalentTo(
-                new[] { 6,4,8 },
+                new[] { 6, 4, 8 },
                 config => config.WithStrictOrdering());
 
         tree.GetKeysPostOrder()
             .Should()
             .BeEquivalentTo(
-                new[] { 4,8,6 },
+                new[] { 4, 8, 6 },
                 config => config.WithStrictOrdering());
     }
 

DataStructures.Tests/BinarySearchTreeTests.cs

@@ -1,8 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using DataStructures.BinarySearchTree;
-using NUnit.Framework;
 
 namespace DataStructures.Tests;
 

DataStructures.Tests/BitArrayTests.cs

@@ -1,7 +1,3 @@
-using System;
-using FluentAssertions;
-using NUnit.Framework;
-
 namespace DataStructures.Tests;
 
 /// <summary>

DataStructures.Tests/Cache/LfuCacheTests.cs

@@ -1,6 +1,4 @@
 using DataStructures.Cache;
-using FluentAssertions;
-using NUnit.Framework;
 
 namespace DataStructures.Tests.Cache;
 

DataStructures.Tests/Cache/LruCacheTests.cs

@@ -1,6 +1,4 @@
 using DataStructures.Cache;
-using FluentAssertions;
-using NUnit.Framework;
 
 namespace DataStructures.Tests.Cache;
 

DataStructures.Tests/DisjointSet/DisjointSetTests.cs

@@ -1,6 +1,4 @@
 using DataStructures.DisjointSet;
-using FluentAssertions;
-using NUnit.Framework;
 
 namespace DataStructures.Tests.DisjointSet;
 

DataStructures.Tests/Fenwick/BinaryIndexedTreeTests.cs

@@ -1,6 +1,4 @@
 using DataStructures.Fenwick;
-using FluentAssertions;
-using NUnit.Framework;
 
 namespace DataStructures.Tests.Fenwick;
 

DataStructures.Tests/GlobalUsings.cs

@@ -0,0 +1,20 @@
+// -----------------------------------------------------------------------------
+// Global using directives for the C-Sharp solution.
+// These namespaces are imported globally so they don’t need to be repeatedly declared
+// in individual files, improving readability and reducing boilerplate.
+//
+// Guidelines:
+// - Keep only the most commonly used namespaces here.
+// - Add project-specific namespaces (e.g., Utilities.Extensions) only if they are
+//   required across the majority of files in the project.
+// - Avoid placing rarely used namespaces here to maintain clarity.
+// -----------------------------------------------------------------------------
+
+global using System;                        // Core base classes and fundamental types
+global using System.Collections.Generic;    // Generic collection types (List, Dictionary, etc.)
+global using System.Linq;                   // LINQ query operators for collections
+global using System.Text;                   // Text encoding, StringBuilder, etc.
+global using NUnit.Framework;               // Testing framework providing attributes and assertions for test cases
+global using NUnit.Framework.Internal;      // Internal NUnit infrastructure (test context, utilities) — generally used for advanced or framework-level test control
+global using FluentAssertions;              // Assertion library for more readable and expressive unit tests
+global using System.Collections;            // Non-generic collection types (e.g., ArrayList, Hashtable, IDictionary, ICollection)

DataStructures.Tests/Graph/DirectedWeightedGraphTests.cs

@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using DataStructures.Graph;
-using FluentAssertions;
-using NUnit.Framework;
 
 namespace DataStructures.Tests.Graph;