String Comparison Unit Test Helper

TestHelper.cs

public static class TestHelpers
{
    public static void ShouldEqualWithDiff(this string actualValue, string expectedValue)
    {
        if (actualValue == expectedValue) return;

        Console.WriteLine("Idx Expected  Actual");
        Console.WriteLine("---------------------");
        var maxLength = Math.Max(actualValue.Length, expectedValue.Length);
        for (int i = 0; i < maxLength; i++)
        {
            Console.Write(i);
            Console.Out.WritePadding(i);
            if (i < actualValue.Length)
            {
                Console.Out.WriteCharInfo(actualValue[i]);
            }
            else
                Console.Write("      ");
            Console.Write("\t");
            if (i < expectedValue.Length)
            {
                Console.Out.WriteCharInfo(expectedValue[i]);
            }
            else
                Console.Write(" ");
            Console.WriteLine();
        }
        Console.WriteLine();
        Assert.Equal(actualValue, expectedValue);
    }

    private static void WriteCharInfo(this TextWriter output, char c)
    {
        output.Write((int)c);
        output.WritePadding(c);
        output.Write(c.ToSafeString());
    }

    // Assumes strings smaller than 1000 chars. Typical with unit tests.
    private static void WritePadding(this TextWriter output, int i)
    {
        output.Write(" ");
        if (i < 100)
        {
            output.Write(" ");
        }
        if (i < 10)
        {
            output.Write(" ");
        }
    }

    private static string ToSafeString(this char c)
    {
        switch (c)
        {
            case '\r':
                return @"\r";
            case '\n':
                return @"\n";
            case '\t':
                return @"\t";
        }
        return c.ToString(CultureInfo.InvariantCulture) + " ";
    }
}