The word test is a verb , which is a doing word which is usually used in the context of writing an examination based on the subject studied in  a form called text. The test as the word is means to test the ability of the pupils, students or candidates who are expected to write the test based on what they have been taught,and to ascertain the understanding of those slated to write the test. It could also be in the area of testing  a car that has just been repaired for the purpose of checking if the car is properly repaired....etc