@hanung665 Wikipedia's Criteria of Truth page lists various tests, some better than others.
"[T[here seem to be only three functional, effective tests of truth[:] correspondence, coherence and pragmatic."
"Pragmatic" is "is the knowledge useful in application?"
"Correspondence" is "does the knowledge correspond with that it describes?"
"Coherence" is "are all pertinent facts arranged in a consistent and cohesive fashion as an integrated whole?"