ENH: Add test for the CLI parser

Add test for the CLI parser.

mriqc/tests/test_parser.py

@@ -0,0 +1,98 @@
+# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
+# vi: set ft=python sts=4 ts=4 sw=4 et:
+#
+# Copyright 2021 The NiPreps Developers <nipreps@gmail.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# We support and encourage derived works from this project, please read
+# about our expectations at
+#
+#     https://www.nipreps.org/community/licensing/
+#
+
+"""Test parser."""
+
+import pytest
+
+from mriqc.cli.parser import _build_parser
+
+MIN_ARGS = ["bids_dir", "out", "participant"]
+
+
+@pytest.mark.parametrize(
+    ("args", "code"),
+    [
+        ([], 2),
+    ],
+)
+def test_parser_errors(args, code):
+    """Check behavior of the parser."""
+    with pytest.raises(SystemExit) as error:
+        _build_parser().parse_args(args)
+
+    assert error.value.code == code
+
+
+@pytest.mark.parametrize(
+    "args",
+    [
+        MIN_ARGS,
+    ],
+)
+def test_parser_valid(tmp_path, args):
+    """Check valid arguments."""
+    datapath = tmp_path / "data"
+    datapath.mkdir(exist_ok=True)
+    args[0] = str(datapath)
+
+    opts = _build_parser().parse_args(args)
+
+    assert opts.bids_dir == datapath
+
+
+@pytest.mark.parametrize(
+    ("argval", "_verbosity"),
+    [
+        ("v", "v"),
+        ("vv", "vv"),
+        ("vvv", "vvv"),
+    ],
+)
+def test_verbosity_arg(tmp_path, argval, _verbosity):
+    """Check the correct parsing of the verbosity argument."""
+    datapath = tmp_path / "data"
+    datapath.mkdir(exist_ok=True)
+
+    args = [str(datapath)] + ["--verbose", argval]
+    opts = _build_parser().parse_args(args)
+
+    assert opts.verbose == _verbosity
+
+
+@pytest.mark.parametrize(
+    ("argval", "_species"),
+    [
+        ("human", "human"),
+        ("rat", "rat"),
+    ],
+)
+def test_species_arg(tmp_path, argval, _species):
+    """Check the correct parsing of the species argument."""
+    datapath = tmp_path / "data"
+    datapath.mkdir(exist_ok=True)
+
+    args = [str(datapath)] + ["--species", argval]
+    opts = _build_parser().parse_args(args)
+
+    assert opts.species == _species