There are many synonyms for the phrase "test courage". Some examples include "challenge bravery", "measure fortitude", "assess fearlessness", "evaluate boldness", and "examine grit". These synonyms all convey the idea of testing one's ability to overcome fear and act bravely in the face of difficulty. Whether it's facing a physical challenge, making a difficult decision, or standing up for oneself or others, testing one's courage is an important part of personal growth and development. By using different synonyms for this phrase, one can add variety and nuance to their writing or speech, while still conveying the same fundamental concept.