This line comes from Dylan Thomas's poem "Do not go gentle into that good night". There, the speaker admonishes his father against dying peacefully, instead telling him that he should "rage, rage against the dying of the light". He presents several examples of people who do not die in peace, but instead rage against their mortality. One of those examples are "good men" who, instead of resigning themselves to their fate, think about other things they might have done, and how those deeds would have given them a better reputation. Thus, they rage against the dying of the light.
The noun is 'test' in this sentence
Method 1 Fiction Synopsis<span>Start strong. ...Introduce your main characters near the beginning. ...Cover the entire narrative arc, including the end. ...Demonstrate character development and emotion. ...Polish the synopsis using a strong voice. ...<span>Know when to stop.</span></span>