tl;dr: Groovy cannot find a program (phantomjs, which is on my $PATH) when I attempt to execute the shell command from a class -- it's otherwise finds it just fine from the Groovy Console or from a Grails CLI script. What gives?
We have a Grails script to execute JavaScript unit tests in PhantomJS ("the headless WebKit"). When these tests are executed in a stand-alone script (call it grails test-js) things work just fine. The relevant line from the Grails/Gant script was:
// where 'jsTests' is a List with the paths to each test
def failures = 0
jsTests.each {
Process p = "phantomjs lib/phantom-jasmine/lib/run_jasmine_test.coffee file://${it}".execute()
failures += p.exitValue()
}
But since we want this to run as part of the usual grails test-app cycle, we created an implementation of org.codehaus.groovy.grails.test.GrailsTestType. When we get to the part in that implementation where we need to execute the tests, that same code (as above) doesn't work, and Groovy/Grails complains that:
java.io.IOException: Cannot run program "phantomjs": error=2, No such file or directory
My first thought was that phantomjs was not on my $PATH -- but I know that it is, and again: it worked when run from the Grails/Gant script. So I tried it in the Groovy Console, and it works OK from there.
Now, if I switch from phantomjs to /absolute/path/to/phantomjs, then it works fine. But hard-coding an absolute filesystem path into the class cannot be the solution.
So: why isn't Groovy finding phantomjs under those circumstances?
Update: I suspect that this might have something to do with my IDE (IntelliJ Idea), as this error doesn't appear to be happening when running this from the command line.
