public void TestStringCompression()
{
// solution #1 ineffective string comparison
Assert.Equal("a2b1c5a3", StringCompression.CompressBad("aabcccccaaa"));
// solution #2 with string builder
Assert.Equal("a2b1c5a3", StringCompression.CompressStringBuilder("aabcccccaaa"));
// solution #3 with added check if compressed string is longer than initial one
Assert.Equal("a2b1c5a3", StringCompression.Compress("aabcccccaaa"));
}