Add utils and tests

tests/test_dependency.py

@@ -0,0 +1,92 @@
+import pytest
+from pathlib import Path
+from codechunk.core.dependency import DependencyAnalyzer, DependencyNode
+from codechunk.core.chunking import ParsedChunk, ChunkMetadata
+
+
+class TestDependencyAnalyzer:
+    """Tests for DependencyAnalyzer."""
+
+    def test_analyze_dependencies_basic(self, tmp_path):
+        """Test basic dependency analysis."""
+        main_code = '''
+import os
+import json
+
+def main():
+    pass
+'''
+        utils_code = '''
+from typing import List
+
+def helper():
+    pass
+'''
+
+        (tmp_path / "main.py").write_text(main_code)
+        (tmp_path / "utils.py").write_text(utils_code)
+
+        from codechunk.core.parser import CodeParser
+        parser = CodeParser()
+        parser.discover_files(tmp_path, ["*.py"], [])
+        chunks = parser.parse_all()
+
+        analyzer = DependencyAnalyzer()
+        graph = analyzer.analyze_dependencies(chunks, parser.files)
+
+        assert len(graph) >= 2
+
+    def test_get_essential_chunks(self):
+        """Test getting essential chunks including dependencies."""
+        analyzer = DependencyAnalyzer()
+
+        analyzer.dependency_graph = {
+            "main": DependencyNode(
+                chunk_name="main",
+                file_path=Path("main.py"),
+                module_name="main",
+                dependencies={"utils", "helper"}
+            ),
+            "utils": DependencyNode(
+                chunk_name="utils",
+                file_path=Path("utils.py"),
+                module_name="utils",
+                dependencies={"helper"}
+            ),
+            "helper": DependencyNode(
+                chunk_name="helper",
+                file_path=Path("helper.py"),
+                module_name="helper",
+                dependencies=set()
+            ),
+        }
+
+        essential = analyzer.get_essential_chunks(["main"])
+
+        assert "main" in essential
+        assert "utils" in essential
+        assert "helper" in essential
+
+    def test_empty_project(self):
+        """Test dependency analysis with no chunks."""
+        analyzer = DependencyAnalyzer()
+        graph = analyzer.analyze_dependencies([], [])
+
+        assert len(graph) == 0
+
+
+class TestDependencyNode:
+    """Tests for DependencyNode dataclass."""
+
+    def test_dependency_node_creation(self):
+        """Test creating a dependency node."""
+        node = DependencyNode(
+            chunk_name="test",
+            file_path=Path("test.py"),
+            module_name="test",
+            dependencies={"dep1", "dep2"},
+            dependents={"parent"}
+        )
+
+        assert node.chunk_name == "test"
+        assert node.dependencies == {"dep1", "dep2"}