noun

• the act of subjecting to experimental test in order to determine how well something works
  "they agreed to end the testing of atomic weapons"
• an examination of the characteristics of something
  "there are laboratories for commercial testing"
• the act of giving students or candidates a test (as by questions) to determine what they know or have learned

verb

• put to the test, as for its quality, or give experimental use to
  "This approach has been tried with good results"
• test or examine for the presence of disease or infection
  "screen the blood for the HIV virus"
• examine someone's knowledge of something
  "The teacher tests us every week"
• show a certain characteristic when tested
  "He tested positive for HIV"