fixed ci test

tests/test_install.py

@@ -13,8 +13,8 @@ is_ci_server = os.environ.get("CI") is not None
 
 
 @pytest.mark.skipif(not is_ci_server, reason="only runs on ci server")
-@pytest.mark.parametrize("platform", ["linux", "darwin", "win32"])
-def test_install_jre(platform, tmpdir, regtest):
+def test_install_jre(tmpdir):
+    platform = sys.platform
     jre_folder_root = tmpdir.join(platform).strpath
     install_jre(platform, jre_folder_root)