Using SR.GetResourceString to fetch localized string (#98)

* Using SR.GetResourceString to fetch localized string
* Added unit tests

src/System.Windows.Forms/src/SRCategoryAttribute.cs

@@ -16,7 +16,7 @@ namespace System.Windows.Forms
 
         protected override string GetLocalizedString(string value)
         {
-            return value;
+            return SR.GetResourceString(value);
         }
     }
-}
+}

src/System.Windows.Forms/src/SRDescriptionAttribute.cs

@@ -19,7 +19,7 @@ namespace System.Windows.Forms
                 if (!this.replaced)
                 {
                     this.replaced = true;
-                    base.DescriptionValue = base.Description;
+                    base.DescriptionValue = SR.GetResourceString(base.Description);
                 }
                 return base.Description;
             }
@@ -29,4 +29,4 @@ namespace System.Windows.Forms
         {
         }
     }
-}
+}

src/System.Windows.Forms/tests/UnitTests/SRCategoryAttributeTests.cs

@@ -0,0 +1,26 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Xunit;
+
+namespace System.Windows.Forms.Tests
+{
+    public class SRCategoryAttributeTests
+    {
+        [Fact]
+        public void VerifyCategoryForValidCategoryAttribute()
+        {
+            SRCategoryAttribute srCategoryAttribute = new SRCategoryAttribute(nameof(SR.CatAccessibility));
+            Assert.True(string.Compare(srCategoryAttribute.Category, SR.CatAccessibility) == 0);            
+        }
+
+        [Fact]
+        public void InvalidCategoryShouldReturnCategoryNameAsIs()
+        {
+            const string fakeCategory = "fakeCategory";
+            SRCategoryAttribute srCategoryAttribute = new SRCategoryAttribute(fakeCategory);
+            Assert.True(string.Compare(srCategoryAttribute.Category, fakeCategory) == 0);
+        }
+    }
+}

src/System.Windows.Forms/tests/UnitTests/SRDescriptionAttributeTests.cs

@@ -0,0 +1,28 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Xunit;
+
+namespace System.Windows.Forms.Tests
+{
+    public class SRDescriptionAttributeTests
+    {
+        [Fact]
+        public void VerifyDescriptionAttributeValue()
+        {
+            SRDescriptionAttribute srDescriptionAttribute = new SRDescriptionAttribute(nameof(SR.AboutBoxDesc));
+            Assert.True(string.Compare(srDescriptionAttribute.Description, SR.AboutBoxDesc) == 0);
+
+            //Getting srDescriptionAttribute.Description again should also return description value
+            Assert.True(string.Compare(srDescriptionAttribute.Description, SR.AboutBoxDesc) == 0);
+        }
+
+        [Fact]
+        public void InvalidDescriptionAttributeShouldReturnNull()
+        {
+            SRDescriptionAttribute srDescriptionAttribute = new SRDescriptionAttribute("fake");
+            Assert.Null(srDescriptionAttribute.Description);
+        }
+    }
+}