What's the difference between errors and failures in JUnit? [duplicate]

Question

I'm learning to use JUnit.

Some of my tests have come up as "errors" and some as "failures". What's the difference between the two?

Answer 1

An error is when something breaks and an exception occurs, such as a Null object reference.

A failure is when the test criteria is not met. i.e. when the Assert() fails.

[This is in general, not just junit.]

Answer 2

In simple words,

Errors - mean that while your test was running, there were some unhandled/unforeseen exceptions, and hence, your test case basically crashed without executing fully.

Failures - mean that your test completed successfully, but the test condition of your test criteria has failed(not what you expected it to be).

Answer 3

A failure is when one of your assertions fails--that is, your program does something wrong, and your JUnit test notices and reports the fact.

An error is when some other Exception occurs--one you haven't tested for and didn't expect, such as a NullPointerException or an ArrayIndexOutOfBoundsException.

Answer 4

Failure - When test case fails (Condition that you assert did not succeed)

Error - Unexpected scenarios or errors in executing the test case