diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..520f5d7
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,103 @@
+"""Test configuration and fixtures."""
+
+import pytest
+import sys
+from pathlib import Path
+
+
+@pytest.fixture
+def sample_python_traceback():
+    """Sample Python traceback for testing."""
+    return '''Traceback (most recent call last):
+  File "/app/main.py", line 10, in <module>
+    import requests
+ModuleNotFoundError: No module named 'requests'
+'''
+
+
+@pytest.fixture
+def sample_python_simple_error():
+    """Sample simple Python error for testing."""
+    return "ValueError: invalid value for int() with base '10': 'abc'"
+
+
+@pytest.fixture
+def sample_js_error():
+    """Sample JavaScript error for testing."""
+    return "TypeError: Cannot read property 'map' of undefined"
+
+
+@pytest.fixture
+def sample_go_panic():
+    """Sample Go panic for testing."""
+    return '''panic: runtime error: invalid memory address or nil pointer dereference
+goroutine 1 [running]:
+main.main()
+    /app/main.go:10 +0x20
+'''
+
+
+@pytest.fixture
+def sample_rust_panic():
+    """Sample Rust panic for testing."""
+    return 'thread \'main\' panicked at \'called Result::unwrap() on an Err value: ParseIntError({invalid digit "a" in string}), src/main.rs:10:5'
+
+
+@pytest.fixture
+def sample_json_error():
+    """Sample JSON parse error for testing."""
+    return "JSONDecodeError: Expecting value: line 1 column 1 (char 0)"
+
+
+@pytest.fixture
+def sample_yaml_error():
+    """Sample YAML parse error for testing."""
+    return "ParserError: while parsing a block mapping\n  in \"<unicode>\", line 1, column 1\ndid not find expected key"
+
+
+@pytest.fixture
+def sample_cli_error():
+    """Sample CLI error for testing."""
+    return "error: the following required arguments were not provided:\n    --input <file>"
+
+
+@pytest.fixture
+def sample_unknown_error():
+    """Sample unknown error for testing."""
+    return "Something unexpected happened during processing"
+
+
+@pytest.fixture
+def mock_knowledge_base(tmp_path):
+    """Create a temporary knowledge base for testing."""
+    kb_dir = tmp_path / "knowledge_base"
+    kb_dir.mkdir()
+
+    errors_file = kb_dir / "errors.yaml"
+    errors_file.write_text('''
+errors:
+  - error_type: ImportError
+    language: python
+    severity: high
+    what_happened: Python couldn't find and import a module.
+    why_happened: The module doesn't exist or isn't installed.
+    how_to_fix:
+      - Install the package
+      - Check import statement
+    code_snippets: []
+''')
+
+    patterns_file = kb_dir / "patterns.yaml"
+    patterns_file.write_text('''
+patterns:
+  python:
+    - pattern: "No module named"
+      error_type: ImportError
+      what_happened: Module not found.
+      why_happened: Module is not installed.
+      how_to_fix:
+        - Install the module
+      severity: high
+''')
+
+    return str(kb_dir)