Fix test_pelican.py getpelican#3374

Make it work from any directory within the Pelican package.

Also fixes parallelism.

pelican/__init__.py

@@ -550,11 +550,12 @@ def get_instance(args):
     config_settings_file = args.settings
     if config_settings_file is None:
         if os.path.isfile(DEFAULT_CONFIG_NAME):
-            config_settings_file = DEFAULT_CONFIG_NAME
-            args.settings = DEFAULT_CONFIG_NAME
+            config_settings_file = DEFAULT_CONFIG_NAME  # relative path to $CWD
+            args.settings = DEFAULT_CONFIG_NAME  # relative path to $CWD
         else:
-            config_settings_file = "pelicanconf.py"
-            args.settings = "pelicanconf.py"
+            err_msg = f"Configuration {config_settings_file} file is not found."
+            logger.error(err_msg)
+            raise FileNotFoundError(err_msg)
 
     settings = read_settings(config_settings_file, override=get_config(args))
 

pelican/tests/settings/pelicanconf.py

@@ -0,0 +1 @@
+PATH = "content"

pelican/tests/test_pelican.py

@@ -272,11 +272,19 @@ def test_parse_errors(self):
 
     def test_module_load(self):
         """Test loading via python -m pelican --help displays the help"""
+        tests_subdir = os.path.dirname(__file__)  # anchor to 'tests' directory
+        pelican_srcdir = os.path.dirname(tests_subdir)
+        pelican_pkgdir = os.path.dirname(pelican_srcdir)
+        original_cwd = os.getcwd()
+        os.chdir(pelican_pkgdir)
         output = subprocess.check_output(
             [sys.executable, "-m", "pelican", "--help"]
         ).decode("ascii", "replace")
+
         assert "usage:" in output
 
+        os.chdir(original_cwd)
+
     def test_main_version(self):
         """Run main --version."""
         out = io.StringIO()
@@ -295,19 +303,32 @@ def test_main_help(self):
 
     def test_main_on_content(self):
         """Invoke main on simple_content directory."""
-        content_subdir = "pelican/tests/simple_content"
+        tests_subdir = os.path.dirname(__file__)  # anchor to 'tests' directory
+        pelican_srcdir = os.path.dirname(tests_subdir)
+        pelican_pkgdir = os.path.dirname(pelican_srcdir)
+        original_cwd = os.getcwd()
+        os.chdir(pelican_pkgdir)
+        content_subdir = "pelican/tests/simple_content"  # from pelican_pkgdir POV
         out, err = io.StringIO(), io.StringIO()
+
         with contextlib.redirect_stdout(out), contextlib.redirect_stderr(err):
             with TemporaryDirectory() as temp_dir:
                 # Don't highlight anything.
                 # See https://rich.readthedocs.io/en/stable/highlighting.html
                 with patch("pelican.console", new=Console(highlight=False)):
                     main(["-o", temp_dir, content_subdir])
+
             self.assertIn("Processed 1 article", out.getvalue())
             self.assertEqual("", err.getvalue())
 
+        os.chdir(original_cwd)
+
     def test_main_on_content_markdown_disabled(self):
         """Invoke main on simple_content directory."""
+        tests_subdir = os.path.dirname(__file__)  # anchor to 'tests' directory
+        settings_subdir = tests_subdir + os.sep + "settings"
+        settings_file = settings_subdir + os.sep + "pelicanconf.py"
+        content_subdir = tests_subdir + os.sep + "simple_content"
         with patch.object(
             pelican.readers.MarkdownReader, "enabled", new_callable=PropertyMock
         ) as attr_mock:
@@ -318,11 +339,15 @@ def test_main_on_content_markdown_disabled(self):
                     # Don't highlight anything.
                     # See https://rich.readthedocs.io/en/stable/highlighting.html
                     with patch("pelican.console", new=Console(highlight=False)):
-                        main(["-o", temp_dir, "pelican/tests/simple_content"])
+                        main(["-o", temp_dir, "-s", settings_file, content_subdir])
                 self.assertIn("Processed 0 articles", out.getvalue())
                 self.assertLogCountEqual(
                     1,
                     ".*article_with_md_extension.md: "
                     "Could not import 'markdown.Markdown'. "
                     "Have you installed the 'markdown' package?",
                 )
+
+
+if __file__ == "main":
+    unittest.main()