How to configure sbt test / ScalaTest to only show failures?

Question

Is there a way to truncate the test results to only show result text for unit tests only when the unit test has failed? I\'m working on a Scala project that has 850 unit tests,

Answer 1

Updated answer for Scalatest 3.

Here's the new syntax for your build.sbt file to reprint all the failures at the bottom of the test suite run:

testOptions in Test += Tests.Argument(TestFrameworks.ScalaTest, "-oI")

You might also want to suppress the info notifications, so it's easier to see the failures.

testOptions in Test += Tests.Argument(TestFrameworks.ScalaTest, "-oNCXELOPQRM")

Here's what all the options represent:

• N - drop TestStarting events
• C - drop TestSucceeded events
• X - drop TestIgnored events
• E - drop TestPending events
• H - drop SuiteStarting events
• L - drop SuiteCompleted events
• O - drop InfoProvided events
• P - drop ScopeOpened events
• Q - drop ScopeClosed events
• R - drop ScopePending events
• M - drop MarkupProvided events

"-oI" prints the error notifications again at the end of the test suite run whereas "-oNCXELOPQRM" only shows the tests that fail.

See the configuring reporters section on the ScalaTest website for more detail.

Answer 2

After adding the following to build.sbt, scalaTest will show a fail summary after the standart report:

testOptions in Test += Tests.Argument("-oI") 

I - show reminder of failed and canceled tests without stack traces
T - show reminder of failed and canceled tests with short stack traces
G - show reminder of failed and canceled tests with full stack traces

There is also a "drop TestSucceeded events" flag, but I have failed to use it: http://www.scalatest.org/user_guide/using_the_runner

Answer 3

For those using maven with the scalatest-maven-plugin, you can add this configuration:

<configuration>
  <stdout>I</stdout>
</configuration>

Answer 4

You could try the sbt command

last-grep error test

This should show you the errors/failures only.