diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..e498f80
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,125 @@
+"""Pytest configuration and fixtures for i18n-guardian tests."""
+
+import tempfile
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture
+def temp_dir():
+    """Create a temporary directory for tests."""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        yield Path(tmpdir)
+
+
+@pytest.fixture
+def sample_python_file(temp_dir):
+    """Create a sample Python file with hardcoded strings."""
+    content = '''
+def greet(name):
+    return "Hello, " + name
+
+def farewell():
+    return "Goodbye, world!"
+
+message = "This is a test message"
+url = "https://example.com"
+email = "test@example.com"
+regex = r"^pattern$"
+'''
+    file_path = temp_dir / "test.py"
+    file_path.write_text(content, encoding="utf-8")
+    return file_path
+
+
+@pytest.fixture
+def sample_js_file(temp_dir):
+    """Create a sample JavaScript file with hardcoded strings."""
+    content = '''
+function greet(name) {
+    return "Hello, " + name;
+}
+
+function farewell() {
+    return "Goodbye, world!";
+}
+
+const message = "This is a test message";
+const url = "https://example.com";
+const email = "test@example.com";
+'''
+    file_path = temp_dir / "test.js"
+    file_path.write_text(content, encoding="utf-8")
+    return file_path
+
+
+@pytest.fixture
+def sample_tsx_file(temp_dir):
+    """Create a sample TypeScript React file."""
+    content = '''
+import React from 'react';
+
+export function Welcome() {
+    return (
+        <div>
+            <h1>Welcome to our app</h1>
+            <p>This is a translated message</p>
+        </div>
+    );
+}
+'''
+    file_path = temp_dir / "Welcome.tsx"
+    file_path.write_text(content, encoding="utf-8")
+    return file_path
+
+
+@pytest.fixture
+def sample_package_json(temp_dir):
+    """Create a sample package.json with react-intl."""
+    content = '''
+{
+    "name": "test-app",
+    "version": "1.0.0",
+    "dependencies": {
+        "react-intl": "^5.0.0"
+    }
+}
+'''
+    file_path = temp_dir / "package.json"
+    file_path.write_text(content, encoding="utf-8")
+    return file_path
+
+
+@pytest.fixture
+def sample_locales(temp_dir):
+    """Create sample locale files."""
+    locales_dir = temp_dir / "locales"
+    locales_dir.mkdir()
+
+    en_json = locales_dir / "en.json"
+    en_json.write_text('{"greeting": "Hello"}', encoding="utf-8")
+
+    de_json = locales_dir / "de.json"
+    de_json.write_text('{"greeting": "Hallo"}', encoding="utf-8")
+
+    return locales_dir
+
+
+@pytest.fixture
+def sample_config_file(temp_dir):
+    """Create a sample configuration file."""
+    content = '''
+i18n_library: react-intl
+min_string_length: 3
+key_style: snake_case
+exclude_patterns:
+    - "**/node_modules/**"
+    - "**/.git/**"
+i18n_functions:
+    - formatMessage
+    - t
+'''
+    file_path = temp_dir / ".i18n-guardian.yaml"
+    file_path.write_text(content, encoding="utf-8")
+    return file_path