🧪 Add tests for missing frontmatter in validate_manus_skill

[frostmute]

🎯 What: Added tests to cover the edge case in validate_manus_skill where a skill string is empty or missing frontmatter delimiters (---).
📊 Coverage: The scenario of an empty string or a string completely missing frontmatter YAML is now tested and ensures the correct validation error is returned.
✨ Result: Increased testing coverage for error scenarios in the ManusSkillValidator.

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PR created automatically by Jules for task 4367236266329801359 started by @frostmute

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[gemini-code-assist]

Code Review

This pull request introduces a new test case to verify that the ManusSkillValidator correctly identifies missing YAML frontmatter in SKILL.md files. Feedback suggests adhering to PEP 8 by using two blank lines between top-level functions and refactoring the test to use pytest.mark.parametrize for improved maintainability and edge-case coverage.

[gemini-code-assist]

To adhere to PEP 8, top-level functions should be separated by two blank lines. Additionally, using pytest.mark.parametrize improves the structure and maintainability of these test cases, making it easier to include additional edge cases like a single delimiter (e.g., --- without a closing pair).

Suggested change

	def test_validate_manus_skill_missing_frontmatter():
	errors = ManusSkillValidator.validate_manus_skill("")
	assert len(errors) == 1
	assert errors[0] == "SKILL.md must have YAML frontmatter delimited by '---'."
	errors = ManusSkillValidator.validate_manus_skill("No frontmatter here.")
	assert len(errors) == 1
	assert errors[0] == "SKILL.md must have YAML frontmatter delimited by '---'."
	@pytest.mark.parametrize("skill_content", [
	"",
	"No frontmatter here.",
	"---",
	])
	def test_validate_manus_skill_missing_frontmatter(skill_content):
	errors = ManusSkillValidator.validate_manus_skill(skill_content)
	assert errors == ["SKILL.md must have YAML frontmatter delimited by '---'."]

References

1. PEP 8 recommends surrounding top-level function and class definitions with two blank lines for better readability. ^(link)