MD5/SHA1 Comparison : Automation Discussions

[Billfred]

Hi,

Just started writing a few tests in Ranorex Studio 3 and am fairly new to this so do excuse me if this a stupid question.

The test I am writing involves comparing two files, one before upload and then the resulting file after it has been uploaded to a website. I thought the easiest way of doing this would be comparing the hash value of the two files. I can do this manually using Hashtab or something like that but there are many files that need to be compared and it would probably be a fairly long way of doing things.

Is there a simple way of comparing the hash values in Ranorex or is it easier just to compare the file sizes instead?

Any suggestions would be great, thanks.

[Ciege]

I've not used HashTab or done what you are asking but what comes to mind is to just make a single method that does the hash check for you and call it from within a loop of all your files you want to check.

I would suggest checking to see if HashTab has an open API you can call or even a command line interface. If not, search for another utility that does.

Then, get a List of all your files you want to check, run them through a foreach() loop and pass each one, in turn, to your HashCheck method.

It sounds pretty easy to do and a great use for an automated function (although it does not necessarily need to be using an automated test utility as you can do all of that through standard development).

[sdaly]

Depends on what you are trying to compare? If you just want to know the file has changed then comparing a hash of the file before and after would be an easy way. Here is a simple function to do so, just put this in a user code module. I use SHA1 over MD5 as it is faster to compute.

Code: Select all

   
using System.IO;
using System.Security.Cryptography;

public string CalculateSHA1Hash(string filePath)
   {
      try {
         SHA1CryptoServiceProvider SHA1 = new SHA1CryptoServiceProvider();
         FileStream fs = new FileStream(filePath, FileMode.Open,FileAccess.Read, FileShare.ReadWrite);
         byte[] hashValue = SHA1.ComputeHash(fs);
         fs.Close();
         string strHashData = BitConverter.ToString(hashValue);
         strHashData = strHashData.Replace("-", "");
         return(strHashData);
      } catch (Exception) {
         return "Could not calculate";
      }


}

If you need to verify a value inside the file then you would be better reading the file into a string then doing something like

Code: Select all

Ranorex.Validate.IsTrue(File.ReadAllText(@"c:\test.txt).Contains("Expected changed value"), "Validating file contains value whatever");