Apologies for verbose output, but is this expected - in particular the M2Coordinate for hamcrest being the junit coordinate?:

Found cp tuples for target JvmBinary(BuildFileAddress(FilesystemBuildFile(/home/jsirois/dev/3rdparty/jsirois-pants/src/java/org/pantsbuild/tools/junit/BUILD), main)):
	(u'default', ClasspathEntry(path=u'/home/jsirois/dev/3rdparty/jsirois-pants/.pants.d/compile/jvm/java/classes'))
	(u'default', ArtifactClasspathEntry(coordinate=M2Coordinate(org='args4j', name='args4j', rev='2.32', classifier=None, jar=u'jar'), path=u'/home/jsirois/dev/3rdparty/jsirois-pants/.pants.d/ivy/jars/args4j/args4j/bundles/args4j-2.32.jar'))
	(u'default', ArtifactClasspathEntry(coordinate=M2Coordinate(org='com.google.guava', name='guava', rev='18.0', classifier=None, jar=u'jar'), path=u'/home/jsirois/dev/3rdparty/jsirois-pants/.pants.d/ivy/jars/com.google.guava/guava/bundles/guava-18.0.jar'))
	(u'default', ArtifactClasspathEntry(coordinate=M2Coordinate(org='junit', name='junit', rev='4.12', classifier=None, jar=u'jar'), path=u'/home/jsirois/dev/3rdparty/jsirois-pants/.pants.d/ivy/jars/junit/junit/jars/junit-4.12.jar'))
	(u'default', ArtifactClasspathEntry(coordinate=M2Coordinate(org='junit', name='junit', rev='4.12', classifier=None, jar=u'jar'), path=u'/home/jsirois/dev/3rdparty/jsirois-pants/.pants.d/ivy/jars/org.hamcrest/hamcrest-core/jars/hamcrest-core-1.3.jar'))
	(u'default', ArtifactClasspathEntry(coordinate=M2Coordinate(org='commons-io', name='commons-io', rev='2.4', classifier=None, jar=u'jar'), path=u'/home/jsirois/dev/3rdparty/jsirois-pants/.pants.d/ivy/jars/commons-io/commons-io/jars/commons-io-2.4.jar'))
	(u'default', ArtifactClasspathEntry(coordinate=M2Coordinate(org='com.google.code.findbugs', name='jsr305', rev='3.0.0', classifier=None, jar=u'jar'), path=u'/home/jsirois/dev/3rdparty/jsirois-pants/.pants.d/ivy/jars/com.google.code.findbugs/jsr305/jars/jsr305-3.0.0.jar'))