add test

tests/tests_integration/test_xe_healthcheck.py

@@ -0,0 +1,10 @@
+from click.testing import CliRunner
+
+from xexe.cli import xe_healthcheck
+
+
+def test_xe_healthcheck():
+    runner = CliRunner()
+    result = runner.invoke(xe_healthcheck)
+    assert result.exit_code == 0
+    assert "Something that should clearly appear" in result.output