Test that metadata filters in the configuration files are taken into account when using jupytext --to

CHANGELOG.md

@@ -11,6 +11,7 @@ of R Markdown notebooks as a raw cell in Jupyter (#415)
 - `jupytext notebook.ipynb --to filename.py` will warn that `--to` is used in place of `--output`.
 - Warn if 'Include Metadata' is off when saving text files in Jupyter (#561)
 - Test that notebooks paired through a configuration file are left unmodified (#598)
+- Test that metadata filters in the configuration files are taken into account when using `jupytext --to` (#543)
 
 **Changed**
 - Install Jupytext from source on MyBinder to avoid cache issues (#567)

tests/test_metadata_filters_from_config.py

@@ -0,0 +1,48 @@
+import nbformat
+from nbformat.v4.nbbase import new_notebook, new_markdown_cell
+from jupytext.cli import jupytext as jupytext_cli
+from jupytext.compare import compare, compare_notebooks
+
+
+def test_metadata_filters_from_config(tmpdir):
+    cfg_file = tmpdir.join("jupytext.toml")
+    nb_file = tmpdir.join("notebook.ipynb")
+    md_file = tmpdir.join("notebook.md")
+
+    cfg_file.write(
+        """default_notebook_metadata_filter = "-all"
+default_cell_metadata_filter = "-all"
+"""
+    )
+    nb = new_notebook(
+        cells=[new_markdown_cell("A markdown cell")],
+        metadata={
+            "kernelspec": {
+                "display_name": "Python [conda env:.conda-week1]",
+                "language": "python",
+                "name": "conda-env-.conda-week1-py",
+            },
+            "language_info": {
+                "codemirror_mode": {"name": "ipython", "version": 3},
+                "file_extension": ".py",
+                "mimetype": "text/x-python",
+                "name": "python",
+                "nbconvert_exporter": "python",
+                "pygments_lexer": "ipython3",
+                "version": "3.8.3",
+            },
+            "nbsphinx": {"execute": "never"},
+        },
+    )
+    nbformat.write(nb, str(nb_file))
+
+    jupytext_cli([str(nb_file), "--to", "md"])
+    md = md_file.read()
+
+    compare(md, "A markdown cell\n")
+
+    jupytext_cli([str(md_file), "--to", "notebook", "--update"])
+    nb2 = nbformat.read(str(nb_file), as_version=4)
+
+    del nb2.metadata["jupytext"]
+    compare_notebooks(nb2, nb)