tested vs tried and true

tested and tried and true both are adjectives.

Word	Noun	Adjective	Verb	Adverb
tested	No	Yes	No	No
tried and true	No	Yes	No	No

As adjectives, tested and tried and true are synonyms defined as:

Other synonyms of tested include time-tested, tried.

tested (adjective)	tried and true (adjective)
tested and proved useful or correct	tested and proved to be reliable
tested and proved to be reliable