Assert statement to compare two files for equality

Question

I am writing from one file to another and i created an Assert statement in my tests to check and see if the new file equals the original file but was not sure what is the best way to go about it. I tried Assert.Equals but it returned as failed even though i physically checked both files and they are exactly the same.

 Assert.IsTrue(File.Equals(downloadfile, created), "Files do not match");

Answer 1

Create an MD5 or SHA hash of the files, and compare those.

public string GetFileHash(string filename)
{
    var hash = new SHA1Managed();
    var clearBytes = File.ReadAllBytes(filename);
    var hashedBytes = hash.ComputeHash(clearBytes);
    return ConvertBytesToHex(hashedBytes);
}

public string ConvertBytesToHex(byte[] bytes)
{
    var sb = new StringBuilder();

    for(var i=0; i<bytes.Length; i++)
    {
        sb.Append(bytes[i].ToString("x"));
    }
    return sb.ToString();
}

[Test]
public void CompareTwoFiles()
{
    const string originalFile = @"path_to_file";
    const string copiedFile = @"path_to_file";

    var originalHash = GetFileHash(originalFile);
    var copiedHash = GetFileHash(copiedFile);

    Assert.AreEqual(copiedHash, originalHash);
}