Merge pull request restsharp#1513 from liquidboy/issue-1480

fix restsharp#1480 - ToCamelCase broken for a single word with multiple upperc…

Author: alexeyzimarev

src/RestSharp/Extensions/StringExtensions.cs

@@ -222,9 +222,12 @@ public static string ToPascalCase(this string text, bool removeUnderscores, Cult
 
             string CaseWord(string word)
             {
-                var restOfWord = word.Substring(1).ToLower(culture);
+                var restOfWord = word.Substring(1);
                 var firstChar = char.ToUpper(word[0], culture);
 
+                if (restOfWord.IsUpperCase())
+                    restOfWord = restOfWord.ToLower(culture);
+
                 return string.Concat(firstChar, restOfWord);
             }
         }
@@ -274,6 +277,13 @@ public static string AddDashes(this string pascalCasedWord)
                 "-"
             );
 
+        /// <summary>
+        ///     Checks to see if a string is all uppper case
+        /// </summary>
+        /// <param name="inputString">String to check</param>
+        /// <returns>bool</returns>
+        public static bool IsUpperCase(this string inputString) => IsUpperCaseRegex.IsMatch(inputString);
+
         /// <summary>
         /// Add an underscore prefix to a pascal-cased string
         /// </summary>

test/RestSharp.Tests/StringExtensionsTests.cs

@@ -66,6 +66,14 @@ public void ToPascalCase(string start, bool removeUnderscores, string finish)
             Assert.AreEqual(finish, result);
         }
 
+        [Test, TestCase("DueDate", "dueDate"), TestCase("ID", "id"), TestCase("IDENTIFIER", "identifier"), TestCase("primaryId", "primaryId"), TestCase("A", "a"), TestCase("ThisIsATest", "thisIsATest")]
+        public void ToCamelCase(string start, string finish)
+        {
+            var result = start.ToCamelCase(CultureInfo.InvariantCulture);
+
+            Assert.AreEqual(finish, result);
+        }
+
         [Test]
         public void Does_not_throw_on_invalid_encoding()
         {