Add test for valid config with hyphenated extras.

tests/test_config.py

@@ -9,6 +9,7 @@
 from dom_toml.parser import BadConfigError
 from domdf_python_tools.paths import PathPlus, in_directory
 from pyproject_examples import (
+		OPTIONAL_DEPENDENCIES,
 		bad_buildsystem_config,
 		bad_pep621_config,
 		valid_buildsystem_config,
@@ -21,7 +22,13 @@
 
 
 @pytest.mark.parametrize("set_defaults", [True, False])
-@pytest.mark.parametrize("toml_config", valid_pep621_config)
+@pytest.mark.parametrize(
+		"toml_config",
+		[
+				*valid_pep621_config,
+				pytest.param(f"{OPTIONAL_DEPENDENCIES}dev-test = ['black']\n", id="optional-dependencies-hyphen"),
+				]
+		)
 def test_pep621_class_valid_config(
 		toml_config: str,
 		tmp_pathplus: PathPlus,

tests/test_config_/test_pep621_class_valid_config_optional_dependencies_hyphen_False_.yml

@@ -0,0 +1,10 @@
+dynamic: []
+name: spam
+optional-dependencies:
+  dev-test:
+  - black
+  test:
+  - matplotlib>=3.0.0; platform_machine != "aarch64" or python_version > "3.6"
+  - pytest<5.0.0
+  - pytest-cov[all]
+version: 2020.0.0

tests/test_config_/test_pep621_class_valid_config_optional_dependencies_hyphen_True_.yml

@@ -0,0 +1,23 @@
+authors: []
+classifiers: []
+dependencies: []
+description: null
+dynamic: []
+entry-points: {}
+gui-scripts: {}
+keywords: []
+license: null
+maintainers: []
+name: spam
+optional-dependencies:
+  dev-test:
+  - black
+  test:
+  - matplotlib>=3.0.0; platform_machine != "aarch64" or python_version > "3.6"
+  - pytest<5.0.0
+  - pytest-cov[all]
+readme: null
+requires-python: null
+scripts: {}
+urls: {}
+version: 2020.0.0