SessionFake Set Better Mimic DotNet Session Behvaiour

[MTuffinProgressive]

HttpContextMoq/src/HttpContextMoq/SessionFake.cs

Line 27 in c517b94

public void Set(string key, byte[] value) => this.data.Add(key, value);

The dotnet Session when you set again it will just updates the existing dictionary entry

Example:
HttpContext.Session.SetString("TestMe", "TestValue");
HttpContext.Session.SetString("TestMe", "TestValue1");

Value in session with key just gets updated

I created my own session fake and here is the fix if you want to incorporate into the sessionfake here

public void Set(string key, byte[] value)
{
if(this.data.ContainsKey(key))
{
this.data[key] = value;
}
else
{
this.data.Add(key, value);
}
}