diff --git a/tests/test_chunking.py b/tests/test_chunking.py
new file mode 100644
index 0000000..4169e40
--- /dev/null
+++ b/tests/test_chunking.py
@@ -0,0 +1,144 @@
+import pytest
+from pathlib import Path
+from codechunk.core.chunking import CodeChunker, ChunkPriority, ParsedChunk, ChunkMetadata
+from codechunk.config import ChunkingConfig
+
+
+class TestCodeChunker:
+    """Tests for CodeChunker."""
+
+    def test_calculate_priority_high_for_main_function(self):
+        """Test that 'main' function gets high priority."""
+        config = ChunkingConfig()
+        chunker = CodeChunker(config)
+
+        chunk = ParsedChunk(
+            name="main",
+            chunk_type="function",
+            content="def main():\n    pass",
+            metadata=ChunkMetadata(
+                file_path=Path("test.py"),
+                file_name="test.py",
+                language="python",
+                start_line=1,
+                end_line=2,
+                line_count=2
+            )
+        )
+
+        result = chunker._calculate_priority(chunk)
+
+        assert result.priority >= 50
+
+    def test_calculate_priority_class_higher_than_function(self):
+        """Test that classes get higher priority than functions."""
+        config = ChunkingConfig()
+        chunker = CodeChunker(config)
+
+        func_chunk = ParsedChunk(
+            name="helper",
+            chunk_type="function",
+            content="def helper():\n    pass",
+            metadata=ChunkMetadata(
+                file_path=Path("test.py"),
+                file_name="test.py",
+                language="python",
+                start_line=1,
+                end_line=2,
+                line_count=2
+            )
+        )
+
+        class_chunk = ParsedChunk(
+            name="MyClass",
+            chunk_type="class",
+            content="class MyClass:\n    pass",
+            metadata=ChunkMetadata(
+                file_path=Path("test.py"),
+                file_name="test.py",
+                language="python",
+                start_line=1,
+                end_line=2,
+                line_count=2
+            )
+        )
+
+        func_priority = chunker._calculate_priority(func_chunk)
+        class_priority = chunker._calculate_priority(class_chunk)
+
+        assert class_priority.priority > func_priority.priority
+
+    def test_remove_boilerplate_dunder_methods(self):
+        """Test that dunder methods are detected."""
+        config = ChunkingConfig()
+        chunker = CodeChunker(config)
+
+        chunk = ParsedChunk(
+            name="MyClass.__str__",
+            chunk_type="function",
+            content="def __str__(self):\n    return 'MyClass'",
+            metadata=ChunkMetadata(
+                file_path=Path("test.py"),
+                file_name="test.py",
+                language="python",
+                start_line=1,
+                end_line=2,
+                line_count=2
+            )
+        )
+
+        result = chunker._remove_boilerplate(chunk)
+        assert result.is_boilerplate is True
+
+    def test_sort_by_priority(self):
+        """Test that chunks are sorted by priority."""
+        config = ChunkingConfig()
+        chunker = CodeChunker(config)
+
+        low_chunk = ParsedChunk(
+            name="helper",
+            chunk_type="function",
+            content="def helper():\n    pass",
+            metadata=ChunkMetadata(
+                file_path=Path("test.py"),
+                file_name="test.py",
+                language="python",
+                start_line=1,
+                end_line=2,
+                line_count=2
+            ),
+            priority=10
+        )
+
+        high_chunk = ParsedChunk(
+            name="main",
+            chunk_type="function",
+            content="def main():\n    pass",
+            metadata=ChunkMetadata(
+                file_path=Path("test.py"),
+                file_name="test.py",
+                language="python",
+                start_line=1,
+                end_line=2,
+                line_count=2
+            ),
+            priority=100
+        )
+
+        chunks = [low_chunk, high_chunk]
+        sorted_chunks = chunker._sort_by_priority(chunks)
+
+        assert sorted_chunks[0].name == "main"
+        assert sorted_chunks[1].name == "helper"
+
+
+class TestChunkPriority:
+    """Tests for ChunkPriority constants."""
+
+    def test_priority_values(self):
+        """Test that priority constants have expected values."""
+        assert ChunkPriority.CRITICAL == 100
+        assert ChunkPriority.HIGH == 75
+        assert ChunkPriority.MEDIUM == 50
+        assert ChunkPriority.LOW == 25
+        assert ChunkPriority.MINIMAL == 10