diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..20c23c3
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,111 @@
+"""Pytest configuration and fixtures for AI Code Audit CLI tests."""
+
+import pytest
+import tempfile
+from pathlib import Path
+
+
+@pytest.fixture
+def sample_python_code():
+    """Sample Python code with various issues."""
+    return '''
+import os
+import unused_module
+
+def example_function(password="secret123"):
+    api_key = "AKIAIOSFODNN7EXAMPLE"
+    try:
+        result = os.system(f"echo {password}")
+    except:
+        pass
+    return result
+
+def bad_function(items=[]):
+    for i in range(100):
+        pass
+    return items
+'''
+
+
+@pytest.fixture
+def clean_python_code():
+    """Sample clean Python code without issues."""
+    return '''
+def calculate_sum(numbers: list[int]) -> int:
+    """Calculate the sum of a list of numbers."""
+    total = 0
+    for num in numbers:
+        total += num
+    return total
+
+if __name__ == "__main__":
+    numbers = [1, 2, 3, 4, 5]
+    print(calculate_sum(numbers))
+'''
+
+
+@pytest.fixture
+def sample_javascript_code():
+    """Sample JavaScript code with various issues."""
+    return '''
+const apiKey = "sk-1234567890abcdef";
+const password = "secret123";
+
+function processData(data) {
+    try {
+        const result = eval(data.userInput);
+        return result;
+    } catch (e) {
+        // Silent catch
+    }
+}
+
+function badExample(items = []) {
+    for (let i = 0; i < 100; i++) {
+        console.log(i);
+    }
+}
+'''
+
+
+@pytest.fixture
+def temp_directory():
+    """Create a temporary directory with test files."""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        yield Path(tmpdir)
+
+
+@pytest.fixture
+def test_files(temp_directory, sample_python_code, clean_python_code, sample_javascript_code):
+    """Create test files in temp directory."""
+    (temp_directory / "bad_code.py").write_text(sample_python_code)
+    (temp_directory / "good_code.py").write_text(clean_python_code)
+    (temp_directory / "bad_code.js").write_text(sample_javascript_code)
+    return temp_directory
+
+
+@pytest.fixture
+def mock_scan_result():
+    """Create a mock scan result for testing."""
+    from src.core.models import ScanResult, Issue, IssueCategory, SeverityLevel
+
+    result = ScanResult(files_scanned=3, target_path="/test")
+    result.add_issue(Issue(
+        severity=SeverityLevel.HIGH,
+        category=IssueCategory.SECURITY,
+        file_path="/test/file.py",
+        line_number=5,
+        message="Hardcoded credential detected",
+        suggestion="Use environment variables",
+        scanner_name="test",
+    ))
+    result.add_issue(Issue(
+        severity=SeverityLevel.MEDIUM,
+        category=IssueCategory.ANTI_PATTERN,
+        file_path="/test/file.py",
+        line_number=10,
+        message="Mutable default argument detected",
+        suggestion="Use None as default",
+        scanner_name="test",
+    ))
+    return result