Add tests that check our argument parsing logic

- going the arguments provided by the user
- to the relevant function being called.

Added tests because I discovered a bug that the tests would have caught.

tests/test_mpsd_software.py

@@ -572,6 +572,67 @@ def test_get_available_releases():
         assert isinstance(release, str)
 
 
+def test_argument_line_parsing(mocker):
+    """Check to find error in argparse logic"""
+
+    ### available
+    sys.argv = ["mpsd-software-tests", "available"]
+    mock = mocker.patch(
+        "mpsd_software_manager.mpsd_software.get_available_releases", return_value=None
+    )
+    with pytest.raises(SystemExit):
+        mod.main()
+
+    sys.argv = ["mpsd-software-tests", "available", "dev-23a"]
+    mock = mocker.patch(
+        "mpsd_software_manager.mpsd_software.get_available_package_sets",
+        return_value=None,
+    )
+    mod.main()
+    call_argument = mock.call_args[0][0]
+    assert call_argument == "dev-23a"
+
+    ### prepare
+    sys.argv = ["mpsd-software-tests", "prepare", "dev-23a"]
+    mock = mocker.patch(
+        "mpsd_software_manager.mpsd_software.prepare_environment", return_value=None
+    )
+    mod.main()
+    call_argument = mock.call_args[0][0]
+    assert call_argument == "dev-23a"
+
+    ### install
+    mock = mocker.patch(
+        "mpsd_software_manager.mpsd_software.install_environment", return_value=None
+    )
+    sys.argv = ["mpsd-software-tests", "install", "dev-23a", "foss2022a-mpi"]
+    mod.main()
+    assert mock.call_args[0][0] == "dev-23a"
+    assert mock.call_args[0][1] == ["foss2022a-mpi"]
+
+    sys.argv = [
+        "mpsd-software-tests",
+        "install",
+        "23b",
+        "foss2022a-mpi",
+        "foss2022a-serial",
+    ]
+    mod.main()
+    assert mock.call_args[0][0] == "23b"
+    assert mock.call_args[0][1] == ["foss2022a-mpi", "foss2022a-serial"]
+
+    ### status
+    mock = mocker.patch(
+        "mpsd_software_manager.mpsd_software.environment_status", return_value=None
+    )
+    sys.argv = ["mpsd-software-tests", "status", "dev-23a"]
+    mod.main()
+    assert mock.call_args[0][0] == "dev-23a"
+
+    ### remove (argparse doesn't allow this yet.
+    ### Copy from 'install' when the time has come.)
+
+
 def test_interface(tmp_path):
     """Test other things (not implemented yet)."""
     pass
@@ -581,6 +642,7 @@ def test_interface(tmp_path):
     # check that the help message is printed when -h is provided
     # check that the error messages are also logged to the log file
     # check that `/` in release is handled correctly
+    # check that `mpsd-software prepare dev-23a` works
 
 
 # other tests to add (ideally)