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tests/test_todo_parser.py

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+"""Unit tests for TodoParser."""
+import pytest
+from datetime import datetime
+from src.parsers.todo_parser import TodoParser, Task
+
+
+class TestTodoParser:
+    """Tests for TodoParser class."""
+    
+    def test_parse_simple_task(self) -> None:
+        """Test parsing a simple task without metadata."""
+        line = "Buy milk"
+        task = TodoParser.parse_line(line)
+        
+        assert task is not None
+        assert task.description == "Buy milk"
+        assert task.completed == False
+        assert task.priority is None
+        assert len(task.projects) == 0
+        assert len(task.contexts) == 0
+    
+    def test_parse_task_with_priority(self) -> None:
+        """Test parsing a task with priority."""
+        line = "(A) Write blog post"
+        task = TodoParser.parse_line(line)
+        
+        assert task is not None
+        assert task.priority == "A"
+        assert task.description == "Write blog post"
+    
+    def test_parse_task_with_creation_date(self) -> None:
+        """Test parsing a task with creation date."""
+        line = "(B) 2026-01-31 Finish implementation"
+        task = TodoParser.parse_line(line)
+        
+        assert task is not None
+        assert task.priority == "B"
+        assert task.creation_date == datetime(2026, 1, 31)
+        assert task.description == "Finish implementation"
+    
+    def test_parse_task_with_projects(self) -> None:
+        """Test parsing a task with project tags."""
+        line = "Write tests +myorg-assistant +testing"
+        task = TodoParser.parse_line(line)
+        
+        assert task is not None
+        assert "myorg-assistant" in task.projects
+        assert "testing" in task.projects
+        assert task.description == "Write tests"
+    
+    def test_parse_task_with_contexts(self) -> None:
+        """Test parsing a task with context tags."""
+        line = "Call dentist @telefon @recados"
+        task = TodoParser.parse_line(line)
+        
+        assert task is not None
+        assert "telefon" in task.contexts
+        assert "recados" in task.contexts
+        assert task.description == "Call dentist"
+    
+    def test_parse_task_with_due_date(self) -> None:
+        """Test parsing a task with due date metadata."""
+        line = "(A) Submit report +work due:2026-02-15"
+        task = TodoParser.parse_line(line)
+        
+        assert task is not None
+        assert task.due_date == datetime(2026, 2, 15)
+        assert "due" in task.metadata
+        assert task.metadata["due"] == "2026-02-15"
+    
+    def test_parse_completed_task(self) -> None:
+        """Test parsing a completed task."""
+        line = "x 2026-01-31 Buy groceries"
+        task = TodoParser.parse_line(line)
+        
+        assert task is not None
+        assert task.completed == True
+        assert task.completion_date == datetime(2026, 1, 31)
+        assert task.description == "Buy groceries"
+    
+    def test_parse_complex_task(self) -> None:
+        """Test parsing a complex task with all features."""
+        line = "(A) 2026-01-31 Write observability blog post +observability-blog @computer-deep due:2026-02-15 priority:high"
+        task = TodoParser.parse_line(line)
+        
+        assert task is not None
+        assert task.priority == "A"
+        assert task.creation_date == datetime(2026, 1, 31)
+        assert task.description == "Write observability blog post"
+        assert "observability-blog" in task.projects
+        assert "computer-deep" in task.contexts
+        assert task.due_date == datetime(2026, 2, 15)
+        assert task.metadata["priority"] == "high"
+    
+    def test_parse_empty_line(self) -> None:
+        """Test parsing an empty line returns None."""
+        task = TodoParser.parse_line("")
+        assert task is None
+    
+    def test_parse_comment_line(self) -> None:
+        """Test parsing a comment line returns None."""
+        task = TodoParser.parse_line("# This is a comment")
+        assert task is None
+    
+    def test_format_simple_task(self) -> None:
+        """Test formatting a simple task."""
+        formatted = TodoParser.format_task(description="Buy milk")
+        assert formatted == "Buy milk"
+    
+    def test_format_task_with_priority(self) -> None:
+        """Test formatting a task with priority."""
+        formatted = TodoParser.format_task(
+            description="Write tests",
+            priority="A"
+        )
+        assert formatted == "(A) Write tests"
+    
+    def test_format_task_with_all_features(self) -> None:
+        """Test formatting a complex task."""
+        formatted = TodoParser.format_task(
+            description="Write blog post",
+            priority="B",
+            creation_date=datetime(2026, 1, 31),
+            projects=["observability-blog"],
+            contexts=["computer-deep"],
+            metadata={"due": "2026-02-15"}
+        )
+        assert "(B)" in formatted
+        assert "2026-01-31" in formatted
+        assert "Write blog post" in formatted
+        assert "+observability-blog" in formatted
+        assert "@computer-deep" in formatted
+        assert "due:2026-02-15" in formatted
+    
+    def test_format_completed_task(self) -> None:
+        """Test formatting a completed task."""
+        formatted = TodoParser.format_task(
+            description="Buy groceries",
+            completed=True,
+            completion_date=datetime(2026, 1, 31)
+        )
+        assert formatted.startswith("x 2026-01-31")
+        assert "Buy groceries" in formatted
+    
+    def test_parse_file(self) -> None:
+        """Test parsing multiple tasks from file content."""
+        content = """# Tasks
+(A) Write tests +myorg-assistant
+Buy milk @recados
+x 2026-01-30 Completed task
+
+(B) 2026-01-31 Another task +project due:2026-02-01"""
+        
+        tasks = TodoParser.parse_file(content)
+        assert len(tasks) == 4
+        assert tasks[0].description == "Write tests"
+        assert tasks[1].description == "Buy milk"
+        assert tasks[2].completed == True
+        assert tasks[3].priority == "B"
+    
+    def test_filter_tasks_by_completion(self) -> None:
+        """Test filtering tasks by completion status."""
+        tasks = [
+            Task(raw_line="x Task 1", line_number=1, completed=True, description="Task 1"),
+            Task(raw_line="Task 2", line_number=2, completed=False, description="Task 2"),
+            Task(raw_line="Task 3", line_number=3, completed=False, description="Task 3"),
+        ]
+        
+        active = TodoParser.filter_tasks(tasks, completed=False)
+        assert len(active) == 2
+        
+        completed = TodoParser.filter_tasks(tasks, completed=True)
+        assert len(completed) == 1
+    
+    def test_filter_tasks_by_priority(self) -> None:
+        """Test filtering tasks by priority."""
+        tasks = [
+            Task(raw_line="(A) Task 1", line_number=1, priority="A", description="Task 1"),
+            Task(raw_line="(B) Task 2", line_number=2, priority="B", description="Task 2"),
+            Task(raw_line="Task 3", line_number=3, description="Task 3"),
+        ]
+        
+        high_priority = TodoParser.filter_tasks(tasks, priority="A")
+        assert len(high_priority) == 1
+        assert high_priority[0].description == "Task 1"
+    
+    def test_filter_tasks_by_project(self) -> None:
+        """Test filtering tasks by project tag."""
+        tasks = [
+            Task(raw_line="Task 1 +project1", line_number=1, description="Task 1", projects=["project1"]),
+            Task(raw_line="Task 2 +project2", line_number=2, description="Task 2", projects=["project2"]),
+            Task(raw_line="Task 3 +project1", line_number=3, description="Task 3", projects=["project1"]),
+        ]
+        
+        project1_tasks = TodoParser.filter_tasks(tasks, project="project1")
+        assert len(project1_tasks) == 2
+    
+    def test_filter_tasks_by_context(self) -> None:
+        """Test filtering tasks by context tag."""
+        tasks = [
+            Task(raw_line="Task 1 @home", line_number=1, description="Task 1", contexts=["home"]),
+            Task(raw_line="Task 2 @work", line_number=2, description="Task 2", contexts=["work"]),
+            Task(raw_line="Task 3 @home", line_number=3, description="Task 3", contexts=["home"]),
+        ]
+        
+        home_tasks = TodoParser.filter_tasks(tasks, context="home")
+        assert len(home_tasks) == 2