feat: implement knowledge management system (spec complete, all 53 tasks done)
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"""Tests for LinkRegistry – Web-Link-Management als Wissensartefakte.
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Requirements: 8.1, 8.2, 8.4, 8.5, 8.6, 8.7
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"""
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from __future__ import annotations
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from pathlib import Path
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from unittest.mock import patch
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import pytest
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from monorepo.knowledge.sources.link import LinkRegistry
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@pytest.fixture
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def context_path(tmp_path: Path) -> Path:
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"""Create a minimal knowledge context path."""
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knowledge = tmp_path / "bahn" / "knowledge"
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knowledge.mkdir(parents=True)
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return knowledge
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@pytest.fixture
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def registry(context_path: Path) -> LinkRegistry:
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"""Create a LinkRegistry instance."""
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return LinkRegistry(context_path)
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# ---------------------------------------------------------------------------
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# save_link tests
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# ---------------------------------------------------------------------------
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class TestSaveLink:
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"""Tests for save_link."""
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def test_save_link_creates_file(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Req 8.1: Links stored as artifacts of type link in links/ folder."""
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with patch.object(registry, "_fetch_metadata", return_value=("Example Page", "A description")):
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result = registry.save_link("https://example.com", title="Example")
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assert result.exists()
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assert result.parent == context_path / "links"
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assert result.suffix == ".md"
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def test_save_link_frontmatter_contains_required_fields(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Req 8.2: Frontmatter must contain url, title, tags, created, type: link."""
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with patch.object(registry, "_fetch_metadata", return_value=("", "")):
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result = registry.save_link(
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"https://example.com/page",
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title="My Link",
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tags=["python", "docs"],
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)
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content = result.read_text(encoding="utf-8")
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assert "type: link" in content
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assert "title: My Link" in content
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assert "url: https://example.com/page" in content
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assert "python" in content
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assert "docs" in content
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assert "created:" in content
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def test_save_link_with_tags(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Tags are included in the frontmatter."""
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with patch.object(registry, "_fetch_metadata", return_value=("", "")):
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result = registry.save_link(
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"https://example.com",
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title="Test",
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tags=["tag1", "tag2"],
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)
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content = result.read_text(encoding="utf-8")
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assert "tag1" in content
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assert "tag2" in content
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def test_save_link_empty_tags(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Links can be saved without tags."""
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with patch.object(registry, "_fetch_metadata", return_value=("", "")):
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result = registry.save_link("https://example.com", title="No Tags")
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assert result.exists()
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content = result.read_text(encoding="utf-8")
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assert "tags: []" in content
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def test_save_link_uses_fetched_title_if_none(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Req 8.4: Fetch title from URL when not provided."""
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with patch.object(
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registry, "_fetch_metadata", return_value=("Fetched Title", "Desc")
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):
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result = registry.save_link("https://example.com")
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content = result.read_text(encoding="utf-8")
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assert "Fetched Title" in content
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def test_save_link_fetch_failed_sets_flag(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Req 8.5: Set fetch_failed: true if URL is unreachable."""
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with patch.object(registry, "_fetch_metadata", return_value=("", "")):
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result = registry.save_link("https://unreachable.example.com")
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content = result.read_text(encoding="utf-8")
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assert "fetch_failed: true" in content
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def test_save_link_creates_links_directory(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""links/ directory is created if it doesn't exist."""
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assert not (context_path / "links").exists()
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with patch.object(registry, "_fetch_metadata", return_value=("", "")):
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result = registry.save_link("https://example.com", title="Test")
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assert (context_path / "links").exists()
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assert result.exists()
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# ---------------------------------------------------------------------------
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# Deduplication tests
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# ---------------------------------------------------------------------------
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class TestDeduplication:
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"""Tests for URL deduplication with tag merging. Req 8.7."""
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def test_duplicate_url_merges_tags(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Req 8.7: Duplicate URLs merge tags instead of creating new artifact."""
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with patch.object(registry, "_fetch_metadata", return_value=("Page", "")):
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first = registry.save_link(
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"https://example.com/dup",
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title="Page",
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tags=["tag1", "tag2"],
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)
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second = registry.save_link(
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"https://example.com/dup",
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title="Page Updated",
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tags=["tag2", "tag3"],
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)
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# Should be the same file
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assert first == second
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content = first.read_text(encoding="utf-8")
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assert "tag1" in content
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assert "tag2" in content
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assert "tag3" in content
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def test_duplicate_url_preserves_existing_tags(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Existing tags are preserved when merging."""
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with patch.object(registry, "_fetch_metadata", return_value=("Page", "")):
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registry.save_link(
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"https://example.com/keep",
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title="Keep",
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tags=["original"],
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)
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result = registry.save_link(
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"https://example.com/keep",
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title="Keep",
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tags=["new"],
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)
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content = result.read_text(encoding="utf-8")
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assert "original" in content
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assert "new" in content
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def test_duplicate_url_no_change_if_tags_same(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""No rewrite if tags are already the same."""
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with patch.object(registry, "_fetch_metadata", return_value=("Page", "")):
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first = registry.save_link(
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"https://example.com/same",
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title="Same",
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tags=["a", "b"],
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)
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content_before = first.read_text(encoding="utf-8")
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second = registry.save_link(
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"https://example.com/same",
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title="Same",
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tags=["a", "b"],
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)
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content_after = second.read_text(encoding="utf-8")
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assert first == second
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assert content_before == content_after
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def test_different_urls_create_separate_files(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Different URLs create separate link artifacts."""
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with patch.object(registry, "_fetch_metadata", return_value=("P", "")):
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first = registry.save_link("https://a.com", title="A")
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second = registry.save_link("https://b.com", title="B")
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assert first != second
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assert first.exists()
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assert second.exists()
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# ---------------------------------------------------------------------------
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# search_links tests
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# ---------------------------------------------------------------------------
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class TestSearchLinks:
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"""Tests for search_links. Req 8.6."""
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def _create_link(
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self, registry: LinkRegistry, url: str, title: str, tags: list[str]
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) -> Path:
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"""Helper to create a link artifact."""
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with patch.object(registry, "_fetch_metadata", return_value=("", "")):
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return registry.save_link(url, title=title, tags=tags)
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def test_search_by_url(self, registry: LinkRegistry) -> None:
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"""Req 8.6: Search finds links matching URL."""
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self._create_link(registry, "https://python.org", "Python", ["lang"])
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self._create_link(registry, "https://rust-lang.org", "Rust", ["lang"])
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results = registry.search_links("python")
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assert len(results) == 1
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assert results[0].metadata.title == "Python"
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def test_search_by_title(self, registry: LinkRegistry) -> None:
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"""Req 8.6: Search finds links matching title."""
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self._create_link(registry, "https://a.com", "Django Documentation", ["web"])
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self._create_link(registry, "https://b.com", "Flask Tutorial", ["web"])
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results = registry.search_links("django")
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assert len(results) == 1
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assert results[0].metadata.title == "Django Documentation"
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def test_search_by_tag(self, registry: LinkRegistry) -> None:
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"""Req 8.6: Search finds links matching tag."""
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self._create_link(registry, "https://a.com", "A", ["python", "web"])
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self._create_link(registry, "https://b.com", "B", ["rust", "systems"])
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results = registry.search_links("rust")
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assert len(results) == 1
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assert results[0].metadata.title == "B"
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def test_search_case_insensitive(self, registry: LinkRegistry) -> None:
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"""Search is case-insensitive."""
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self._create_link(registry, "https://a.com", "Django Docs", ["Python"])
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results = registry.search_links("DJANGO")
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assert len(results) == 1
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results = registry.search_links("python")
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assert len(results) == 1
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def test_search_no_results(self, registry: LinkRegistry) -> None:
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"""Returns empty list when nothing matches."""
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self._create_link(registry, "https://a.com", "Something", ["tag"])
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results = registry.search_links("nonexistent")
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assert results == []
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def test_search_empty_links_dir(self, registry: LinkRegistry) -> None:
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"""Returns empty list when links directory doesn't exist."""
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results = registry.search_links("anything")
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assert results == []
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def test_search_multiple_matches(self, registry: LinkRegistry) -> None:
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"""Returns all matching links."""
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self._create_link(registry, "https://a.com", "Python Docs", ["python"])
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self._create_link(registry, "https://b.com", "Python Tutorial", ["tutorial"])
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results = registry.search_links("python")
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assert len(results) == 2
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# ---------------------------------------------------------------------------
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# _fetch_metadata tests
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# ---------------------------------------------------------------------------
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class TestFetchMetadata:
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"""Tests for _fetch_metadata."""
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def test_extracts_title_from_html(self, registry: LinkRegistry) -> None:
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"""Extracts <title> from HTML response."""
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html = b"<html><head><title>Test Page Title</title></head><body></body></html>"
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with patch("urllib.request.urlopen") as mock_urlopen:
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mock_response = mock_urlopen.return_value.__enter__.return_value
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mock_response.read.return_value = html
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mock_response.headers.get_content_charset.return_value = "utf-8"
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title, desc = registry._fetch_metadata("https://example.com")
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assert title == "Test Page Title"
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def test_extracts_meta_description(self, registry: LinkRegistry) -> None:
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"""Extracts meta description from HTML."""
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html = (
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b'<html><head><title>T</title>'
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b'<meta name="description" content="A page about testing">'
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b"</head></html>"
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)
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with patch("urllib.request.urlopen") as mock_urlopen:
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mock_response = mock_urlopen.return_value.__enter__.return_value
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mock_response.read.return_value = html
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mock_response.headers.get_content_charset.return_value = "utf-8"
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title, desc = registry._fetch_metadata("https://example.com")
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assert desc == "A page about testing"
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def test_returns_empty_on_network_error(self, registry: LinkRegistry) -> None:
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"""Returns empty strings when fetch fails."""
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with patch("urllib.request.urlopen", side_effect=Exception("Network error")):
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title, desc = registry._fetch_metadata("https://unreachable.test")
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assert title == ""
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assert desc == ""
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# ---------------------------------------------------------------------------
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# _find_existing tests
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# ---------------------------------------------------------------------------
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class TestFindExisting:
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"""Tests for _find_existing."""
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def test_finds_existing_url(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Finds an existing link by URL."""
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with patch.object(registry, "_fetch_metadata", return_value=("T", "")):
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saved = registry.save_link("https://example.com/exists", title="T")
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found = registry._find_existing("https://example.com/exists")
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assert found == saved
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def test_returns_none_for_unknown_url(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Returns None when URL doesn't exist."""
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found = registry._find_existing("https://never-saved.com")
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assert found is None
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def test_returns_none_for_empty_dir(
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self, registry: LinkRegistry, context_path: Path
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) -> None:
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"""Returns None when links dir doesn't exist."""
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found = registry._find_existing("https://example.com")
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assert found is None
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