Why does scalatest mix up the output?

Question

I run my scalatest from sbt, and the output gets mixed up - scalatest prints all the test run, and comments to them, and somewhere in the middle it prints the statistics:

Answer 1

Have the same issue and solved it by saving logs into separate files. Not ideal, but good for CI, especially in case of long-running integration tests. How I did it:

1. Create a special directory for logs (for example, at the end of build.sbt):

   lazy val logDirectory = taskKey[File]("A directory for logs")
   logDirectory := {
     val r = target.value / "logs"
     IO.createDirectory(r)
     r
   }
   

2. [Optionally] Specify a file for a summary information in a project:

   testOptions in test += Tests.Argument(
     TestFrameworks.ScalaTest, "-fW", (logDirectory.value / "summary.log").toString
   )
   

   W disables colors

3. Create a group for each test. Each group must run a test in a forked JVM with special arguments:

   testGrouping in test := testGrouping.value.flatMap { group =>
     group.tests.map { suite =>
       val fileName = {
         // foo.bar.baz.TestSuite -> f.b.b.TestSuite
         val parts = suite.name.split('.')
         (parts.init.map(_.substring(0, 1)) :+ parts.last).mkString(".")
       }
   
       val forkOptions = ForkOptions(
         bootJars = Nil,
         javaHome = javaHome.value,
         connectInput = connectInput.value,
         outputStrategy = outputStrategy.value,
         runJVMOptions = javaOptions.value ++ Seq(
           "-Dour.logging.appender=FILE",
           s"-Dour.logging.dir=${logDirectory.value / fileName}"
         ),
         workingDirectory = Some(baseDirectory.value),
         envVars = envVars.value
       )
   
       group.copy(
         name = suite.name,
         runPolicy = Tests.SubProcess(forkOptions),
         tests = Seq(suite)
       )
     }
   }
   

   Note, we can tell the logback, where we save our logs through our.logging.appender and our.logging.dir

4. Create a configuration for logging (test/resources/logback-test.xml):

   
   
       
           System.out
           
               %date{yyyy-MM-dd HH:mm:ss} %-5level [%thread] %logger{26} - %msg%n
           
       
   
       
           ${our.logging.dir}/test.log
           false
           
               %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%thread] %logger{26} - %msg%n
           
       
   
       
           
       
   
   

That's all.