When it comes to describing the idea of "standing the test", there are several synonyms you can use to convey the same concept. One option is to use the term "enduring", which means to withstand or persist through a challenging situation. Another option is to use the phrase "passing muster", which relates to meeting or exceeding expectations. Additionally, you could use the term "proving oneself", which conveys the idea of demonstrating one's capabilities or worthiness. Ultimately, the idea behind all of these synonyms is that something or someone has been able to withstand a challenge or scrutiny and has proven their strength, reliability, or suitability.