scala - Custom NIO filesystem doesn't load through SBT's test task -


for testing, i'm using in-memory nio filesystem implementaion ( memoryfs ). i've taken advantage of before, , seems run fine through e.g. maven.

however, now, in sbt project, it's impossible initialize new filesystem.

here's minimal sbt configuration reproduce problem:

import sbt._ import keys._  name := "testfs" organization := "com.example version := "0.1-snapshot"  scalaversion := "2.11.6"  librarydependencies ++= {    val scalatestversion = "2.2.5"   seq(     "org.scalatest" %% "scalatest" % scalatestversion % "test",     "org.mockito" %  "mockito-core" % "1.10.19" % "test",     "de.pfabulist.lindwurm" %  "memoryfs" % "0.28.3"   % "test"   )}

and here's test:

import de.pfabulist.lindwurm.memory.memoryfsbuilder import org.scalatest.{flatspec, mustmatchers}   class fsdummyspec extends flatspec mustmatchers {    must "init fs" in {     new memoryfsbuilder().watchservice(true).name("testfs").build() //init here   } }

running sbt test result in:

[info] fsdummyspec: [info] - must init fs *** failed *** [info]   java.nio.file.providernotfoundexception: provider "memoryfs" not found [info]   @ java.nio.file.filesystems.getfilesystem(filesystems.java:224) [info]   @ de.pfabulist.kleinod.paths.pathss.getorcreate(pathss.java:76)

here's thing: this should run without problems. question is: why, , how fix it?

glancing on custom fs provider docs looks sbt borks classpath somehow, hard why.

note: interestingly enough, intellij idea's test runner seems work without hitch, problem on command line (in "sbt proper").

the comment opencage hinted @ solution.

it turns out custom file systems require additional element, i.e. service provider definition file located in meta-inf/services.

if use custom nio filesystem, need make provider definition file available in test classpath.

the simplest way fork test vm, i.e. add following build.sbt:

fork in test := true

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