Allow possibility to specify the Working Directory

[mdaloia]

Currently when the plugin is executed from a project the working directory is the project base dir. [1]
The phantomjs command executes using this directory and there isn't option to change it.

Add a workingDirectory optional parameter to the exec goal to customize it.

I think that given that this goal it is bound by default to the lifecycle phase test the default working directory must be the ${project.build.testOutputDirectory} with the posibility to change it. [2]

[1]
PhantomJsProcessBuilder.start() uses ProcessBuilder and looking at the JavaDoc of java.lang.ProcessBuilder.directory() we find this:

"The returned value may be null -- this means to use the working directory of the current Java process, usually the directory named by the system property user.dir, as the working directory of the child process."

[2]
This will break backward compatibility but to get the same behavior of version < 0.5 you can set <workingDirectory>${project.basedir}</workingDirectory> inside the section of this plugin.

[klieber]

@mdaloia thanks for your contribution. I think the workingDirectory parameter makes sense but I'm not interested in breaking compatibility just to default it to ${project.build.testOutputDirectory}. If you're willing to update your pull request to remove that default I'll get it merged in.

[mdaloia]

@klieber I updated the pull request but it seems that Travis-CI is having some misbehavior with the IT tests, mostly with exec-with-command-line-options but sometime there are others (e.g. simple-it). For example in this build 3/3 jobs failed. After deleting only a blank line in this build 2/3 jobs failed.
As an admin of the project on Travis-CI maybe you can see the build.log for each IT test or you can run the IT tests with -e -X maven args to know what it's going on.
When I run locally the mvn verify -Prun-its it runs successfully every time.

My environment is:

• Windows 7 x64
• Oracle Java JDK 1.8.0_25
• Maven 3.2.3

This is a log excerpt:

[INFO] Building: exec-with-command-line-options/pom.xml
[INFO] run script verify.groovy
[INFO] ..FAILED (11.1 s)
[INFO] The post-build script did not succeed. phantomjs script execution failed.. Expression: buildLog.contains(Documentation can be found at the web site, http://phantomjs.org.)