Running tests attempts to open directory as file

[jtzwu]

When running gradle test with the plugin install, I get the following error. Gradle version 1.9.

An exception or error caused a run to abort. This may have been caused by a problematic custom reporter.
java.io.FileNotFoundException: /home/username/src/xxx/build/reports/tests (No such file or directory)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.(FileOutputStream.java:212)
at java.io.FileOutputStream.(FileOutputStream.java:165)
at org.scalatest.tools.HtmlReporter.(HtmlReporter.scala:57)
at org.scalatest.tools.ReporterFactory.createHtmlReporter(ReporterFactory.scala:118)
at org.scalatest.tools.ReporterFactory.org$scalatest$tools$ReporterFactory$$getReporterFromConfiguration$1(ReporterFactory.scala:155)
at org.scalatest.tools.ReporterFactory$$anonfun$1.apply(ReporterFactory.scala:162)
at org.scalatest.tools.ReporterFactory$$anonfun$1.apply(ReporterFactory.scala:161)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.Iterator$class.foreach(Iterator.scala:727)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1156)
at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
at org.scalatest.tools.ReporterConfigurations.foreach(ReporterConfiguration.scala:37)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
at org.scalatest.tools.ReporterConfigurations.map(ReporterConfiguration.scala:37)
at org.scalatest.tools.ReporterFactory.getDispatchReporter(ReporterFactory.scala:161)
at org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:1643)
at org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:703)
at org.scalatest.tools.Runner$.main(Runner.scala:573)
at org.scalatest.tools.Runner.main(Runner.scala)