ray-project--ray/python/ray/data/tests/unit

Unit Tests

This directory contains unit tests that do not depend on distributed infrastructure or external dependencies.

Requirements

Unit tests in this directory must be:

• Fast: Execute in milliseconds, not seconds
• Isolated: No dependencies on Ray runtime, external services, or file I/O
• Deterministic: No randomness or time-based behavior

Restrictions

Tests should NOT:

• Initialize or use the Ray distributed runtime
• Use time.sleep() or other time-based delays
• Depend on external services, databases, or file systems
• Make network calls

Enforcement

The conftest.py in this directory enforces these restrictions by preventing:

• ray.init() from being called
• time.sleep() from being used

If a test requires any of these, it should be moved to the main test directory instead.