diff --git a/.tests/unit/test_generators.py b/.tests/unit/test_generators.py
new file mode 100644
index 0000000..e482784
--- /dev/null
+++ b/.tests/unit/test_generators.py
@@ -0,0 +1,218 @@
+"""Unit tests for generators."""
+
+import pytest
+from code_doc_cli.generators.markdown_generator import MarkdownGenerator
+from code_doc_cli.generators.templates import DocumentationTemplate, SyntaxHighlighter
+from code_doc_cli.parsers.base import DocElement, ElementType, Parameter
+
+
+class TestMarkdownGenerator:
+    """Tests for Markdown generator."""
+
+    @pytest.fixture
+    def sample_elements(self):
+        """Create sample documentation elements."""
+        elements = []
+
+        module_elem = DocElement(
+            name="sample_module",
+            element_type=ElementType.MODULE,
+            description="This is a sample module for testing.",
+            full_docstring="This is a sample module for testing.",
+            source_file="sample.py",
+            line_number=1,
+        )
+        elements.append(module_elem)
+
+        func_elem = DocElement(
+            name="add",
+            element_type=ElementType.FUNCTION,
+            description="Add two numbers together.",
+            full_docstring="Add two numbers together.\n\nArgs:\n  a: First number\n  b: Second number",
+            parameters=[
+                Parameter(name="a", type_hint="int", description="First number"),
+                Parameter(name="b", type_hint="int", description="Second number"),
+            ],
+            return_type="int",
+            return_description="The sum of a and b",
+            source_file="sample.py",
+            line_number=10,
+            visibility="public",
+        )
+        elements.append(func_elem)
+
+        class_elem = DocElement(
+            name="Calculator",
+            element_type=ElementType.CLASS,
+            description="A simple calculator class.",
+            full_docstring="A simple calculator class.",
+            attributes=[
+                ("memory", "int", "Current stored value in memory"),
+            ],
+            source_file="sample.py",
+            line_number=20,
+            visibility="public",
+            decorators=["@dataclass"],
+        )
+        elements.append(class_elem)
+
+        return elements
+
+    def test_generate_markdown(self, sample_elements):
+        """Test Markdown generation."""
+        generator = MarkdownGenerator()
+        output = generator.generate(elements=sample_elements)
+
+        assert "# API Documentation" in output
+        assert "sample_module" in output
+        assert "add" in output
+        assert "Calculator" in output
+
+    def test_generate_function_markdown(self, sample_elements):
+        """Test function documentation in Markdown."""
+        generator = MarkdownGenerator()
+        output = generator.generate(elements=sample_elements)
+
+        assert "### add" in output
+        assert "int" in output
+        assert "First number" in output
+
+    def test_generate_class_markdown(self, sample_elements):
+        """Test class documentation in Markdown."""
+        generator = MarkdownGenerator()
+        output = generator.generate(elements=sample_elements)
+
+        assert "## Calculator" in output
+        assert "memory" in output
+
+    def test_generate_json(self, sample_elements):
+        """Test JSON generation."""
+        generator = MarkdownGenerator()
+        output = generator.generate_json(elements=sample_elements)
+
+        assert '"name": "add"' in output
+        assert '"type": "function"' in output
+        assert '"parameters"' in output
+
+    def test_generate_json_structure(self, sample_elements):
+        """Test JSON output structure."""
+        generator = MarkdownGenerator()
+        output = generator.generate_json(elements=sample_elements)
+
+        import json
+        data = json.loads(output)
+
+        assert "generated_at" in data
+        assert "elements" in data
+        assert len(data["elements"]) == 3
+
+    def test_custom_title(self, sample_elements):
+        """Test custom documentation title."""
+        generator = MarkdownGenerator()
+        output = generator.generate(elements=sample_elements, title="Custom Title")
+
+        assert "# Custom Title" in output
+
+    def test_no_metadata(self, sample_elements):
+        """Test generation without metadata."""
+        generator = MarkdownGenerator()
+        output = generator.generate(elements=sample_elements, include_metadata=False)
+
+        assert "Generated on" not in output
+
+    def test_empty_elements(self):
+        """Test generation with no elements."""
+        generator = MarkdownGenerator()
+        output = generator.generate(elements=[])
+
+        assert "# API Documentation" in output
+
+
+class TestDocumentationTemplate:
+    """Tests for documentation template."""
+
+    def test_format_function(self):
+        """Test function template formatting."""
+        template = DocumentationTemplate()
+        params = [("a", "int", None, "First number"), ("b", "int", None, "Second number")]
+        output = template.format_function(
+            name="add",
+            description="Add two numbers.",
+            parameters=params,
+            return_type="int",
+            return_description="The sum",
+            raises=[("ValueError", "If inputs are invalid")],
+            examples=["add(1, 2)  # Returns 3"],
+            source_file="test.py",
+            line_number=10,
+            decorators=[],
+        )
+
+        assert "### add" in output
+        assert "Add two numbers" in output
+        assert "| a |" in output
+        assert "| b |" in output
+        assert "Returns:" in output
+        assert "Raises:" in output
+
+    def test_format_class(self):
+        """Test class template formatting."""
+        template = DocumentationTemplate()
+        output = template.format_class(
+            name="Calculator",
+            description="A calculator class.",
+            attributes=[("value", "int", "Stored value")],
+            methods=["add", "subtract"],
+            parameters=[("BaseClass", "Some description")],
+            decorators=["@dataclass"],
+            source_file="test.py",
+            line_number=5,
+        )
+
+        assert "## Calculator" in output
+        assert "A calculator class" in output
+        assert "Attributes:" in output
+        assert "value" in output
+        assert "Methods:" in output
+
+    def test_format_module(self):
+        """Test module template formatting."""
+        template = DocumentationTemplate()
+        output = template.format_module(
+            name="my_module",
+            description="This is my module.",
+            imports=["os", "sys"],
+            elements_count={"functions": 5, "classes": 2, "constants": 3},
+        )
+
+        assert "# my_module" in output
+        assert "This is my module" in output
+        assert "os" in output
+        assert "functions" in output
+
+
+class TestSyntaxHighlighter:
+    """Tests for syntax highlighter."""
+
+    def test_highlight_python(self):
+        """Test Python syntax highlighting."""
+        highlighter = SyntaxHighlighter()
+        code = "def hello():\n    print('world')"
+        output = highlighter.highlight(code, "python")
+
+        assert output
+        assert "<pre>" in output or "code" in output.lower()
+
+    def test_highlight_with_theme(self):
+        """Test different themes."""
+        for theme in ["default", "dark", "light"]:
+            highlighter = SyntaxHighlighter(theme=theme)
+            assert highlighter.theme is not None
+
+    def test_get_css(self):
+        """Test CSS generation."""
+        highlighter = SyntaxHighlighter()
+        css = highlighter.get_css()
+
+        assert css
+        assert "pre" in css or "code" in css