Different dotnet test results from cmd.exe

What I'm trying to achieve: I want to use a web application to run all the tests on my local windows PC.

I am using the following command:

c:/code/myRepo && dotnet test

I have tried the following command through run:

cmd.exe /C "c:/code/myRepo && dotnet test"

which runs successfully and all my tests pass.

I now want to run this from my .net Core application as so:

public static string RunCommand( string cmd)
{
    var escapedArgs = cmd.Replace("\"", "\\\"");

    var process = new Process()
    {
        StartInfo = new ProcessStartInfo
        {
            FileName = "cmd.exe",
            Arguments = $"/C \"{escapedArgs}\"",
            RedirectStandardOutput = true,
            UseShellExecute = false,
            CreateNoWindow = false,
        }
    };
    process.Start();
    string result = process.StandardOutput.ReadToEnd();
    process.WaitForExit();
    return result;
}

When I run the tests from here the tests run, but they all fail.

Question: there is something different between these 2 environments but I have no idea what, how /what can I check what might be different. I've tried the command:

set

and can't see anything obviously affecting the environment