I'm writing an integration test method in scala (play framework). The test class is SourceIntegrationTest. I've placed a file, source.json, in /test/resources. I'm aware that "sbt copies files from src/test/resources to target/scala-[scalaVersion]/test-classes" as described in this answer. However, using the answer referenced there only works for me when running my test in IntelliJ. When I run sbt it:testOnly SourceIntegrationTest in terminal, my test fails with a NullPointerException. sbt cannot find source.json. How can I get sbt to find my file when running my integration test in terminal?
My test method looks like:
#Test
def testGetSource(): Unit = {
val jsonSource: String = Source.fromInputStream(getClass.getClassLoader.getResourceAsStream("source.json")).mkString
val json: JsValue = Json.parse(jsonSource)
val source = controller.getSource(json)
assertEquals(source.sourceName = "Premier")
}
When you write an integration test, the test file is not placed in the test folder. You need to create another directory for integration test. Now the source folder will contain three directories main, test, it. And all integration test will be kept in it folder. You can read about it here
Related
I need to create directories and files for some tests. My project uses sbt as the build tool, and common practice is to use File.createTempFile or similar APIs, but I abhor that practice. I want all files created by my tests to reside somewhere inside the output directory (<module>/target/), so that they'll be removed when I run clean, but otherwise preserved if I have need of them to figure out test failures.
The test framework is not relevant: if your solution requires a particular framework, I'll happily adopt it or figure out how it does the trick and use that.
In short, I need the answer to one of these two questions:
How can I create a file inside the build output directory from a test run by sbt?
How can I find out what is the build output directory for the current project from a test run by sbt?
In ScalaTest, try passing target
settingKey[File]("Main directory for files generated by the build.")
to config map as -Dkey=value. For example, in build.sbt specify
Test / testOptions += Tests.Argument(s"-DtargetDir=${target.value}")
and then define test like so
import org.scalatest._
class ExampleSpec extends fixture.FlatSpec with fixture.ConfigMapFixture with Matchers {
"The config map" should "contain target directory used by sbt" in { configMap =>
configMap should contain key "targetDir"
}
I need to compile a scala code which calls a java code from it.
What I did:
1]I have a scala main file check.scala
package com.code
class check {
var Rectvalue = Array.ofDim[Int](5)
val str = Array.ofDim[String](1)
def nativeacces(arg: String, loop: Integer) {
val test = new testing()
test.process(arg, Rectvalue,str)
}
}
2.For creating instance val test = new testing() ,i added two .class(sample.class,testJNI.class) file from java source code inside the folder(package) com/code.
3.When I compile the scala code using
scalac check.scala
It generates the class file for the scala file.
What I have to do:
1.Instead of .class(sample.class,testJNI.class) file added inside the package ,i need to add jar file.
2.I tried, created jar file for the .class file and compile the Scala, it shows the error:
scala:6: error: not found: type testing
val test = new testing()
3.I need to link the .jar file and compile the scala main file
You can reference classes/directories/JARs via classpath option:
scalac -classpath your.jar check.scala
Related question: Adding .jar's to classpath (Scala).
If you want a proper build use SBT, put your JAR in lib directory in the root of project and it will figure out what to do for you. Here is Hello World of SBT.
I use sbt in the following fashion: I run ~ test:compile in sbt and then work in IDE, watching occasionaly if the project still compiles, because the IDE's presentation compiler tends to be buggy. When I git pull some code, there might be changes in the project/ files, so I want to have reload. Is there a way, how to watch both source files and project files, so when there is change in project files, I actually get the update?
As jsuereth explained this isn't a task SBT can handle in 1 instance. What's required is a reboot of SBT to abort the watching process and reload it's own configuration.
The following Scala script does exactly this, it uses Java NIO WatchService and Scala Process to monitor a path and restart a process. The code should be fairly simple to understand:
#!/usr/bin/env scala
import java.nio.file._
import scala.collection.JavaConversions._
import scala.sys.process._
val file = Paths.get(args(0))
val cmd = args(1)
val watcher = FileSystems.getDefault.newWatchService
file.register(
watcher,
StandardWatchEventKinds.ENTRY_CREATE,
StandardWatchEventKinds.ENTRY_MODIFY,
StandardWatchEventKinds.ENTRY_DELETE
)
def exec = cmd run true
#scala.annotation.tailrec
def watch(proc: Process): Unit = {
val key = watcher.take
val events = key.pollEvents
val newProc =
if (!events.isEmpty) {
proc.destroy()
exec
} else proc
if (key.reset) watch(newProc)
else println("aborted")
}
watch(exec)
Usage in your sbt dir would be:
watchr.scala project/ "sbt ~ test:compile"
If anything is unclear don't hesitate to ask, of course any scripting language could be used to implement this behavior.
You actually can't use ~ <task> and have it rebuild the project itself right now, because ~ <task> needs to read the build definition itself to determine:
What source files to watch
How to run the task.
What you're doing is altering the config whe project/ changes. This requires a full reload or reboot of sbt to pull in the new configuration.
So, as of sbt 0.13, this isn't possible. You can have it so it will rebuild your source code when project/ changes, but without rebuilding the build definition, not much help.
You could create a new sbt prompt, or task, that when run could check to see if source files in project/ are updated and issue a warning/error so you know to reboot. That's probably the best option right now.
I'm trying to get sbt to compile and build some benchmarks. I've told it to add the benchmarks to the test path so they're recompiled along with tests, but I can't figure out how to write an action to let me actually run them. Is it possible to invoke classes from the Project definition class, or even just from the command line?
Yes, it is.
If you'd like to run them in the same VM the SBT is run in, then write a custom task similar to the following in your project definition file:
lazy val benchmark = task {
// code to run benchmarks
None // Some("will return an error message")
}
Typing benchmark in SBT console will run the task above. To actually run the benchmarks, or, for that matter, any other class you've compiled, you can reuse some of the existing infrastructure of SBT, namely the method runTask which will create a task that runs something for you. It has the following signature:
def runTask(mainClass: => Option[String], classpath: PathFinder, options: String*): Task
Simply add the following to your file:
lazy val benchmark = task { args =>
runTask(Some("whatever.your.mainclass.is"), testClasspath, args)
}
When running benchmarks, it is sometimes recommended that you run them in a separate jvm invocation, to get more reliable results. SBT allows you to run separate processes by invoking a method ! on a string command. Say you have a command java -jar path-to-artifact.jar you want to run. Then:
"java -jar path-to-artifact.jar" !
runs the command in SBT. You want to put the snippet above in a separate task, same as earlier.
And don't forget to reload when you change your project definition.
Couldn't you simply write the benchmarks as tests, so they will be run when you call 'test' in SBT?
You could also run a specific test with 'test-only', or run a main with 'run' or 'exec' (see http://code.google.com/p/simple-build-tool/wiki/RunningSbt for details).
I want to create an Action to automate GCJ compilation. Since I couldn't make it work with Ant, I decided to try SBT. The docs say how to create an Action and how to run an external process. What I don't yet see is how to reuse the directory tree traversal which exists for java and scala compiler Actions. In this case my input files would be all the .class files under a certain root folder. I would also need to specify a specific classpath for GCJ. Any pointers for this would be appreciated too.
I haven't used GCJ much at all and I'm still pretty new at SBT, but this is how I believe you could write a quick task to do exactly what you are looking for with SBT 0.7.1. You can use a PathFinder to grab all of the class files like so:
val allClasses = (outputPath ##) ** "*.class"
Using that PathFinder and the "compileClasspath" top level method, you can construct a task like this which will run gcj using the current project's classpath and compose all of the .class files into one gcjFile:
val gcj = "/usr/local/bin/gcj"
val gcjFile = "target/my_executable.o"
val allClasses = (outputPath ##) ** "*.class"
lazy val gcjCompile = execTask {
<x>{gcj} --classpath={compileClasspath.get.map(_.absolutePath).mkString(":")} -c {allClasses.get.map(_.absolutePath).mkString("-c ")} -o {gcjFile}</x>
} dependsOn(compile) describedAs("Create a GCJ executable object")