Full Idea
Ramsey's Test for conditionals is that a conditional should be believed if a belief in its antecedent would commit one to believing its consequent.
Gist of Idea
Ramsey's Test: believe the consequent if you believe the antecedent
Source
report of Frank P. Ramsey (Law and Causality [1928]) by Stephen Read - Thinking About Logic Ch.3
Book Reference
Read,Stephen: 'Thinking About Logic' [OUP 1995], p.74
A Reaction
A rather pragmatic approach to conditionals