### Question:
ArtifactHelper { public static File getArtifactFile(final IRepositoryParameters repositoryParameters, final ArtifactItem artifactItem) throws MojoExecutionException { final Artifact artifact = resolve(repositoryParameters, artifactItem); if (artifact != null) { return artifact.getFile(); } return null; } private  ArtifactHelper(); static File getArtifactFile(final IRepositoryParameters repositoryParameters,
                                       final ArtifactItem artifactItem); static List<File> getDependencies(final IRepositoryParameters repositoryParameters,
                                             final List<ArtifactItem> artifacts, final ArtifactScope artifactScope);  }### Answer:
@Test(expected = NullPointerException.class) public void testGetArtifactFileNullArguments() throws Exception { ArtifactHelper.getArtifactFile(null, null); }