Add some Dictionary methods

Refactor Dictionary Unit Tests

Author: engineering87

SharpHelpers/SharpHelpers.UnitTest/Dictionary/DictionaryTest.cs

@@ -4,37 +4,184 @@
 using SharpCoding.SharpHelpers;
 using System;
 using System.Collections.Generic;
-using System.Linq;
 
 namespace SharpHelpers.UnitTest.Dictionary
 {
-
     [TestClass]
     public class DictionaryTest
     {
         [TestMethod]
-        public void TestAddFormat()
+        public void AddFormat_ShouldAddFormattedStringToDictionary()
         {
-            var dic = new Dictionary<int, DateTime>() { { 1, DateTime.Now }, { 2, DateTime.Now } };
-             
+            // Arrange
+            var dictionary = new Dictionary<int, string>();
+
+            // Act
+            dictionary.AddFormat(1, "Hello, {0}!", "World");
+
+            // Assert
+            Assert.AreEqual("Hello, World!", dictionary[1]);
         }
+
         [TestMethod]
-        public void TestRemoveAll()
+        [ExpectedException(typeof(ArgumentNullException))]
+        public void AddFormat_ShouldThrowArgumentNullException_WhenDictionaryIsNull()
         {
-            var dic = new Dictionary<int, DateTime>() { { 1, DateTime.Now }, { 2, DateTime.Now } };
-            dic.RemoveAll(a=> a.Key < 2 );
-            Assert.IsTrue(dic.Count() == 1);
+            // Arrange
+            Dictionary<int, string> dictionary = null;
 
+            // Act
+            dictionary.AddFormat(1, "Hello, {0}!", "World");
+
+            // Assert - [ExpectedException] handles the assertion
         }
+
         [TestMethod]
-        public void TestGetOrCreate()
+        public void RemoveAll_ShouldRemoveItemsBasedOnCondition()
         {
-            var dic = new Dictionary<int,DateTime>() { { 1, DateTime.Now }, { 2, DateTime.Now} };
-            Assert.IsNotNull(dic.GetOrCreate(1));
-            Assert.IsNotNull(dic.GetOrCreate(3));
+            // Arrange
+            var dictionary = new Dictionary<int, string>
+            {
+                { 1, "Apple" },
+                { 2, "Banana" },
+                { 3, "Avocado" }
+            };
 
-          
+            // Act
+            dictionary.RemoveAll(kvp => kvp.Value.StartsWith("A"));
+
+            // Assert
+            Assert.AreEqual(1, dictionary.Count);
+            Assert.IsTrue(dictionary.ContainsKey(2));
         }
-    }
 
-}
+        [TestMethod]
+        [ExpectedException(typeof(ArgumentNullException))]
+        public void RemoveAll_ShouldThrowArgumentNullException_WhenDictionaryIsNull()
+        {
+            // Arrange
+            Dictionary<int, string> dictionary = null;
+
+            // Act
+            dictionary.RemoveAll(kvp => kvp.Value.StartsWith("A"));
+
+            // Assert - [ExpectedException] handles the assertion
+        }
+
+        [TestMethod]
+        public void GetOrCreate_ShouldCreateAndReturnNewValue_WhenKeyDoesNotExist()
+        {
+            // Arrange
+            var dictionary = new Dictionary<int, List<string>>();
+
+            // Act
+            var result = dictionary.GetOrCreate(1);
+
+            // Assert
+            Assert.IsNotNull(result);
+            Assert.AreEqual(0, result.Count);
+            Assert.IsTrue(dictionary.ContainsKey(1));
+        }
+
+        [TestMethod]
+        public void AddOrUpdate_ShouldAddNewItem_WhenKeyDoesNotExist()
+        {
+            // Arrange
+            var dictionary = new Dictionary<int, string>();
+
+            // Act
+            dictionary.AddOrUpdate(1, "NewValue");
+
+            // Assert
+            Assert.AreEqual("NewValue", dictionary[1]);
+        }
+
+        [TestMethod]
+        public void AddOrUpdate_ShouldUpdateExistingItem_WhenKeyExists()
+        {
+            // Arrange
+            var dictionary = new Dictionary<int, string>
+            {
+                { 1, "OldValue" }
+            };
+
+            // Act
+            dictionary.AddOrUpdate(1, "UpdatedValue");
+
+            // Assert
+            Assert.AreEqual("UpdatedValue", dictionary[1]);
+        }
+
+        [TestMethod]
+        public void RemoveIfExists_ShouldReturnTrueAndRemoveItem_WhenKeyExists()
+        {
+            // Arrange
+            var dictionary = new Dictionary<int, string>
+            {
+                { 1, "Value" }
+            };
+
+            // Act
+            var result = dictionary.RemoveIfExists(1);
+
+            // Assert
+            Assert.IsTrue(result);
+            Assert.IsFalse(dictionary.ContainsKey(1));
+        }
+
+        [TestMethod]
+        public void RemoveIfExists_ShouldReturnFalse_WhenKeyDoesNotExist()
+        {
+            // Arrange
+            var dictionary = new Dictionary<int, string>();
+
+            // Act
+            var result = dictionary.RemoveIfExists(1);
+
+            // Assert
+            Assert.IsFalse(result);
+        }
+
+        [TestMethod]
+        public void Merge_ShouldMergeDictionariesAndUpdateValues()
+        {
+            // Arrange
+            var dictionary = new Dictionary<int, string>
+            {
+                { 1, "Value1" },
+                { 2, "Value2" }
+            };
+
+            var otherDictionary = new Dictionary<int, string>
+            {
+                { 2, "UpdatedValue2" },
+                { 3, "Value3" }
+            };
+
+            // Act
+            dictionary.Merge(otherDictionary);
+
+            // Assert
+            Assert.AreEqual(3, dictionary.Count);
+            Assert.AreEqual("UpdatedValue2", dictionary[2]);
+            Assert.AreEqual("Value3", dictionary[3]);
+        }
+
+        [TestMethod]
+        public void ToReadableString_ShouldReturnFormattedStringRepresentationOfDictionary()
+        {
+            // Arrange
+            var dictionary = new Dictionary<int, string>
+            {
+                { 1, "Value1" },
+                { 2, "Value2" }
+            };
+
+            // Act
+            var result = dictionary.ToReadableString();
+
+            // Assert
+            Assert.AreEqual("{1: Value1, 2: Value2}", result);
+        }
+    }
+}

SharpHelpers/SharpHelpers.UnitTest/SharpHelpers.UnitTest.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.5.2" />
     <PackageReference Include="MSTest.TestFramework" Version="3.5.2" />
   </ItemGroup>

SharpHelpers/SharpHelpers/DictionaryHelper.cs

@@ -63,6 +63,63 @@ public static TValue GetOrCreate<TKey, TValue>(this IDictionary<TKey, TValue> di
                 dictionary[key] = ret;
             }
             return ret;
+        }
+
+        /// <summary>
+        /// Tries to add a key-value pair to the dictionary. If the key already exists, it updates the value.
+        /// </summary>
+        /// <param name="dictionary">The dictionary to operate on.</param>
+        /// <param name="key">The key to add or update.</param>
+        /// <param name="value">The value to associate with the key.</param>
+        public static void AddOrUpdate<TKey, TValue>(this Dictionary<TKey, TValue> dictionary, TKey key, TValue value)
+        {
+            if (dictionary.ContainsKey(key))
+            {
+                dictionary[key] = value;
+            }
+            else
+            {
+                dictionary.Add(key, value);
+            }
+        }
+
+        /// <summary>
+        /// Removes the entry with the specified key if it exists in the dictionary, and returns a boolean indicating success.
+        /// </summary>
+        /// <param name="dictionary">The dictionary to operate on.</param>
+        /// <param name="key">The key to remove.</param>
+        /// <returns>True if the key was found and removed, otherwise false.</returns>
+        public static bool RemoveIfExists<TKey, TValue>(this Dictionary<TKey, TValue> dictionary, TKey key)
+        {
+            return dictionary.Remove(key);
+        }
+
+        /// <summary>
+        /// Merges the entries from another dictionary into the current dictionary. If a key already exists, its value is updated.
+        /// </summary>
+        /// <param name="dictionary">The dictionary to operate on.</param>
+        /// <param name="otherDictionary">The dictionary to merge from.</param>
+        public static void Merge<TKey, TValue>(this Dictionary<TKey, TValue> dictionary, Dictionary<TKey, TValue> otherDictionary)
+        {
+            foreach (var kvp in otherDictionary)
+            {
+                dictionary.AddOrUpdate(kvp.Key, kvp.Value);
+            }
+        }
+
+        /// <summary>
+        /// Converts the dictionary into a readable string format, useful for debugging.
+        /// </summary>
+        /// <param name="dictionary">The dictionary to convert to a string.</param>
+        /// <returns>A string representation of the dictionary.</returns>
+        public static string ToReadableString<TKey, TValue>(this Dictionary<TKey, TValue> dictionary)
+        {
+            var entries = new List<string>();
+            foreach (var kvp in dictionary)
+            {
+                entries.Add($"{kvp.Key}: {kvp.Value}");
+            }
+            return "{" + string.Join(", ", entries) + "}";
         }
     }
 }