Xunit and private static methods

• Code

It is not recommended to test private methods, because they should be tested indirectly through the public method calling them or make them internal(InternalsVisibleTo). In case there is the need for doing so then here is an example :

[Theory]
[InlineData(new byte[] {0, 1, 23, 86, 95, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, "1599501168")]    
public void DoSomethingWithByteArray( byte[] data,  string expectNumber)
{           
  var byteArrayHelperInstance = new PrivateType(typeof(ByteArrayHelper));
  object[] parameters = { data,17}; //with 2 agrs
or  object[] parameters = { data};    //with 1 arg       
  var customId = (string)byteArrayHelperInstance.InvokeStatic("GetCustomId", parameters);
  Assert.Equal(expectNumber, customId.Trim());
}