System.Globalization.Tests.DateTimeFormatInfoMiscTests.SeparatorsTest C# (CSharp) Method

        public void SeparatorsTest()
        {
            DateTimeFormatInfo dtfi = (DateTimeFormatInfo) CultureInfo.InvariantCulture.DateTimeFormat.Clone();
            Assert.False(dtfi.IsReadOnly, "IsReadOnly expected to be false");

            string dateSep = dtfi.DateSeparator;
            string timeSep = dtfi.TimeSeparator;

            Assert.True(dtfi.ShortDatePattern.IndexOf(dateSep) > 0, "dtfi.ShortDatePattern should be greater than 0");
            Assert.True(dtfi.ShortTimePattern.IndexOf(timeSep) > 0, "dtfi.ShortTimePattern should be greater than 0");

            DateTime d = DateTime.Now;

            string formattedDate = d.ToString("MM/dd/yyyy", dtfi);
            Assert.True(formattedDate.IndexOf(dateSep) > 0, "Expected to find date separator in the formatted string");
            dtfi.DateSeparator = "-";
            string expectedFormattedString = formattedDate.Replace(dateSep, dtfi.DateSeparator);
            Assert.Equal(expectedFormattedString, d.ToString("MM/dd/yyyy", dtfi));

            string formattedTime = d.ToString("HH:mm:ss", dtfi);
            Assert.True(formattedTime.IndexOf(timeSep) > 0, "Expected to find time separator in the formatted string");
            dtfi.TimeSeparator = ".";
            expectedFormattedString = formattedTime.Replace(timeSep, dtfi.TimeSeparator);
            Assert.Equal(expectedFormattedString, d.ToString("HH:mm:ss", dtfi));
        }