E2E Test Failures: Data Transformation Workflow Timeouts

[frankbria]

Problem

Data transformation E2E tests are failing due to timeouts waiting for transformation UI elements and completion.

Failing Tests

• should apply one-hot encoding transformation
• should apply standard scaling transformation

Error Pattern

TimeoutError: locator.waitFor: Timeout 10000ms exceeded.
- waiting for transformation controls/results

Root Cause

The data transformation workflow appears to be:

1. Not completing successfully, OR
2. Not showing transformation UI controls, OR
3. Not displaying transformation results

Investigation Needed

1. Check backend transformation endpoints
2. Verify frontend DataPreparationPage shows transformation controls
3. Check if transformations are applied to dataset
4. Review transformation state management

Related PR

#133 - Fixed E2E infrastructure issues

Environment

• CI environment
• MongoDB running correctly
• Backend health check passing

Acceptance Criteria

• Transformation controls appear in UI
• Transformations apply successfully
• Transformation results displayed
• All transformation-related E2E tests pass

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🔗 Similar Issues

Related Issues

• E2E Test Failures: Upload Workflow Timeouts #134
• E2E Test Failures: Model Training Workflow Timeouts #135
• Fix 23 failing frontend E2E Smoke test errors #125
• E2E Test Failures - 7 tests failing across browsers #35
• Complete Frontend Test Fixes - React 18 Act() Warnings #106

🔗 Related PRs

#54 - fix(backend): Sprint 12 Phase 1 - API Integration Test Fixes [merged]
#119 - Fix three failing frontend tests [merged]

👤 Suggested Assignees

• frankbria

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