System.CodeDom.Tests.TempFileCollectionTests.AddFile_DuplicateFileName_ThrowsArgumentException C# (CSharp) Method

        public void AddFile_DuplicateFileName_ThrowsArgumentException()
        {
            using (var collection = new TempFileCollection())
            {
                const string FileName = "FileName";
                collection.AddFile(FileName, keepFile: false);
                Assert.Throws<ArgumentException>("fileName", () => collection.AddFile(FileName, keepFile: false));

                // Case insensitive
                Assert.Throws<ArgumentException>("fileName", () => collection.AddFile(FileName.ToLowerInvariant(), keepFile: false));
            }
        }