Determining if wire is neutral

[dave-c]

My wall box has two switches with two black wires connected to each. It also has four white wires on a single nut, not otherwise connected. Are these neutral wires? If not sure, how can I test?

 

[westward10]

They are almost certainly neutral but a continuity test will verify.

 

[dave-c]

They are almost certainly neutral but a continuity test will verify.

Thank you. But what are the two ends of that test?