public static void Append_Char(string original, char value, int repeatCount, string expected)
{
StringBuilder builder;
if (repeatCount == 1)
{
// Use Append(char)
builder = new StringBuilder(original);
builder.Append(value);
Assert.Equal(expected, builder.ToString());
}
// Use Append(char, int)
builder = new StringBuilder(original);
builder.Append(value, repeatCount);
Assert.Equal(expected, builder.ToString());
}