    @Test
    public void testGetRelativePathNoCommonBasedir() throws MojoExecutionException {

        JGitSourceReferencesProvider provider = new JGitSourceReferencesProvider();
        File projectBasedir = new File("/foo/test/bar");
        File repoRoot = new File("/baz");
        assertThrows(MojoExecutionException.class, () -> provider.getRelativePath(projectBasedir, repoRoot));
    }