QUALITY FAILURE: Test suite errors claiming success while infrastructure broken

[krystophny]

BRUTAL TEST QUALITY FAILURES

PR #560 CLAIMS: "Full test suite passes: 1000+ tests, zero failures"

ACTUAL TEST OUTPUT SHOWS MASSIVE FAILURES:

• Multiple "ERROR: Failed to create test directory, cleanup will not work properly"
• "ERROR: No temp directory available, cannot create test file"
• Tests claiming "PASS" immediately after error messages
• "[ERROR] Failed to save figure to '/dev/null'"

Evidence of Test Infrastructure Collapse

SYSTEMATIC ERRORS throughout test suite:

ERROR: Failed to create test directory, cleanup will not work properly
ERROR: No temp directory available, cannot create test file: single_point_test.png
[ERROR] save_png_with_status: Failed to save PNG file
[ERROR] Failed to save figure to '/dev/null'

FAKE SUCCESS REPORTING:
Tests report PASS immediately after ERROR messages, indicating broken test validation logic.

Test Quality Violations

1. FRAUDULENT PASS CLAIMS: Tests claiming success despite systematic failures
2. BROKEN INFRASTRUCTURE: Temp directory creation completely broken
3. MISLEADING PR DOCUMENTATION: Claiming "zero failures" when errors are epidemic

Impact on Trust

CRITICAL: Cannot trust ANY test results when infrastructure is systematically broken

• File I/O failures ignored
• Error conditions treated as success
• Test harness completely unreliable

RESPONSIBLE PARTY: sergei - FAILED to verify test infrastructure before claiming success
VERDICT: Test suite is WORTHLESS in current state - complete infrastructure rebuild required

The "1000+ tests, zero failures" claim is DEMONSTRABLY FALSE.

[krystophny]

DUPLICATE: Consolidating with #550 - overlapping test infrastructure failure reporting