diff --git a/.tests/conftest.py b/.tests/conftest.py
new file mode 100644
index 0000000..3b0f6db
--- /dev/null
+++ b/.tests/conftest.py
@@ -0,0 +1,195 @@
+"""Pytest configuration and fixtures."""
+
+import pytest
+import tempfile
+import os
+from pathlib import Path
+
+
+@pytest.fixture
+def sample_python_file():
+    """Sample Python file content."""
+    return '''
+"""This is a sample module for testing."""
+
+def add(a: int, b: int) -> int:
+    """Add two numbers together.
+
+    Args:
+        a: First number
+        b: Second number
+
+    Returns:
+        The sum of a and b
+
+    Raises:
+        ValueError: If either a or b is negative
+    """
+    if a < 0 or b < 0:
+        raise ValueError("Numbers must be positive")
+    return a + b
+
+
+class Calculator:
+    """A simple calculator class.
+
+    Attributes:
+        memory: Current stored value in memory
+    """
+
+    def __init__(self, initial: int = 0):
+        """Initialize calculator with optional starting value.
+
+        Args:
+            initial: Starting value for the calculator
+        """
+        self.memory = initial
+
+    def multiply(self, x: int, y: int) -> int:
+        """Multiply two numbers.
+
+        Args:
+            x: First number
+            y: Second number
+
+        Returns:
+            The product of x and y
+        """
+        return x * y
+'''
+
+
+@pytest.fixture
+def sample_typescript_file():
+    """Sample TypeScript file content."""
+    return '''
+/**
+ * This is a sample TypeScript module for testing.
+ */
+
+export function add(a: number, b: number): number {
+    /**
+     * Add two numbers together.
+     * @param a - First number
+     * @param b - Second number
+     * @returns The sum of a and b
+     */
+    return a + b;
+}
+
+export interface User {
+    id: number;
+    name: string;
+    email?: string;
+}
+
+export class Calculator {
+    private memory: number;
+
+    constructor(initial: number = 0) {
+        /**
+         * Initialize calculator with optional starting value.
+         * @param initial - Starting value
+         */
+        this.memory = initial;
+    }
+
+    /**
+     * Multiply two numbers.
+     * @param x - First number
+     * @param y - Second number
+     * @returns The product of x and y
+     */
+    public multiply(x: number, y: number): number {
+        return x * y;
+    }
+}
+'''
+
+
+@pytest.fixture
+def sample_go_file():
+    """Sample Go file content."""
+    return '''
+// Package calculator provides basic arithmetic operations.
+//
+// This package contains functions for addition, subtraction,
+// multiplication, and division.
+package calculator
+
+import "errors"
+
+// Add two numbers together.
+//
+// Parameters:
+//   a: First number
+//   b: Second number
+//
+// Returns the sum of a and b
+func Add(a, b int) int {
+    return a + b
+}
+
+// Calculator performs arithmetic operations.
+type Calculator struct {
+    memory int
+}
+
+// NewCalculator creates a new Calculator instance.
+//
+// Parameters:
+//   initial: Starting value for the calculator
+//
+// Returns a new Calculator
+func NewCalculator(initial int) *Calculator {
+    return &Calculator{memory: initial}
+}
+
+// Multiply two numbers.
+//
+// Parameters:
+//   x: First number
+//   y: Second number
+//
+// Returns the product of x and y
+func (c *Calculator) Multiply(x, y int) int {
+    return x * y
+}
+'''
+
+
+@pytest.fixture
+def temp_python_file(sample_python_file):
+    """Create a temporary Python file."""
+    with tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False) as f:
+        f.write(sample_python_file)
+        f.flush()
+        yield f.name
+    os.unlink(f.name)
+
+
+@pytest.fixture
+def temp_typescript_file(sample_typescript_file):
+    """Create a temporary TypeScript file."""
+    with tempfile.NamedTemporaryFile(mode="w", suffix=".ts", delete=False) as f:
+        f.write(sample_typescript_file)
+        f.flush()
+        yield f.name
+    os.unlink(f.name)
+
+
+@pytest.fixture
+def temp_go_file(sample_go_file):
+    """Create a temporary Go file."""
+    with tempfile.NamedTemporaryFile(mode="w", suffix=".go", delete=False) as f:
+        f.write(sample_go_file)
+        f.flush()
+        yield f.name
+    os.unlink(f.name)
+
+
+@pytest.fixture
+def temp_directory():
+    """Create a temporary directory with sample files."""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        yield tmpdir