diff --git a/tests/fixtures/sample_code.py b/tests/fixtures/sample_code.py
new file mode 100644
index 0000000..f37c6d5
--- /dev/null
+++ b/tests/fixtures/sample_code.py
@@ -0,0 +1,209 @@
+"""Sample Python module for testing the code indexer."""
+
+
+def add(a, b):
+    """Add two numbers together.
+
+    Args:
+        a: First number to add
+        b: Second number to add
+
+    Returns:
+        The sum of a and b
+
+    Example:
+        >>> add(2, 3)
+        5
+    """
+    return a + b
+
+
+def multiply(a, b):
+    """Multiply two numbers.
+
+    Args:
+        a: First number
+        b: Second number
+
+    Returns:
+        The product of a and b
+    """
+    return a * b
+
+
+def greet(name: str, greeting: str = "Hello") -> str:
+    """Generate a greeting message.
+
+    Args:
+        name: Name of the person to greet
+        greeting: Greeting word to use
+
+    Returns:
+        A formatted greeting string
+
+    Raises:
+        ValueError: If name is empty
+    """
+    if not name:
+        raise ValueError("Name cannot be empty")
+    return f"{greeting}, {name}!"
+
+
+class Calculator:
+    """A simple calculator class for basic arithmetic operations.
+
+    This class provides methods for performing addition, subtraction,
+    multiplication, and division operations.
+
+    Attributes:
+        memory: Current memory value for accumulator operations
+
+    Example:
+        >>> calc = Calculator()
+        >>> calc.add(5)
+        >>> calc.multiply(2)
+        >>> calc.get_memory()
+        10
+    """
+
+    def __init__(self, initial_value: float = 0.0) -> None:
+        """Initialize the calculator with an optional starting value.
+
+        Args:
+            initial_value: The starting value for the calculator
+        """
+        self.memory = initial_value
+
+    def add(self, value: float) -> None:
+        """Add a value to the current memory.
+
+        Args:
+            value: Number to add to memory
+        """
+        self.memory += value
+
+    def subtract(self, value: float) -> None:
+        """Subtract a value from the current memory.
+
+        Args:
+            value: Number to subtract from memory
+        """
+        self.memory -= value
+
+    def multiply(self, value: float) -> None:
+        """Multiply the current memory by a value.
+
+        Args:
+            value: Number to multiply by
+        """
+        self.memory *= value
+
+    def divide(self, value: float) -> None:
+        """Divide the current memory by a value.
+
+        Args:
+            value: Number to divide by
+
+        Raises:
+            ZeroDivisionError: If value is zero
+        """
+        if value == 0:
+            raise ZeroDivisionError("Cannot divide by zero")
+        self.memory /= value
+
+    def get_memory(self) -> float:
+        """Get the current memory value.
+
+        Returns:
+            The current memory value
+        """
+        return self.memory
+
+    def reset(self) -> None:
+        """Reset the memory to zero."""
+        self.memory = 0.0
+
+
+class DataProcessor:
+    """A class for processing data with various operations.
+
+    This class supports filtering, mapping, and aggregating data
+    from various input sources.
+
+    Attributes:
+        data: Internal data storage
+        processed_count: Number of items processed
+
+    Methods:
+        load: Load data from a source
+        filter: Filter data based on criteria
+        map: Transform data elements
+        aggregate: Calculate aggregate statistics
+    """
+
+    def __init__(self) -> None:
+        """Initialize the data processor."""
+        self.data = []
+        self.processed_count = 0
+
+    def load(self, items: list) -> None:
+        """Load data into the processor.
+
+        Args:
+            items: List of items to process
+        """
+        self.data = list(items)
+
+    def filter(self, predicate) -> list:
+        """Filter data based on a predicate function.
+
+        Args:
+            predicate: Function that returns True for items to keep
+
+        Returns:
+            Filtered list of items
+        """
+        result = [item for item in self.data if predicate(item)]
+        self.processed_count += len(result)
+        return result
+
+    def map(self, transform) -> list:
+        """Transform data using a function.
+
+        Args:
+            transform: Function to apply to each item
+
+        Returns:
+            List of transformed items
+        """
+        result = [transform(item) for item in self.data]
+        self.processed_count += len(result)
+        return result
+
+    def aggregate(self, func, initial=None):
+        """Aggregate data using a function.
+
+        Args:
+            func: Aggregation function (e.g., sum, max, min)
+            initial: Initial value for the aggregation
+
+        Returns:
+            Aggregated result
+        """
+        if initial is not None:
+            result = func(self.data, initial)
+        else:
+            result = func(self.data)
+        self.processed_count += 1
+        return result
+
+    def get_stats(self) -> dict:
+        """Get processing statistics.
+
+        Returns:
+            Dictionary with processing stats
+        """
+        return {
+            "total_items": len(self.data),
+            "processed_count": self.processed_count,
+        }