Extend unit tests

[qododavid]

Hi, I used cover-agent to write the tests for this PR. It uses an AI-based workflow to add new test cases that increase code coverage.

All AI-generated tests have met these four essential criteria:

1. Execute successfully
2. Pass all assertions
3. Increase overall code coverage
4. Test previously uncovered behaviors (as specified in the LLM prompt)

Increased Coverage

Coverage Improvement Report
=========================

File: prophet/diagnostics.py
Coverage improvement: 91.98% → 96.62% (+4.64%)
Newly covered lines: 11
Remaining uncovered lines: 8


File: prophet/utilities.py
Coverage improvement: 65.52% → 100.00% (+34.48%)
Newly covered lines: 10
Remaining uncovered lines: 0


File: prophet/forecaster.py
Coverage improvement: 83.27% → 83.94% (+0.67%)
Newly covered lines: 5
Remaining uncovered lines: 120


File: prophet/serialize.py
Coverage improvement: 93.14% → 99.02% (+5.88%)
Newly covered lines: 6
Remaining uncovered lines: 1

Why adding unit tests is important

• Writing and maintaining unit tests can be tedious, especially as codebases grow larger

• Despite this challenge, unit tests provide key benefits:

  • Enable confident code changes through reliable test coverage
  • Allow faster development by preventing regressions
  • Make refactoring safer with comprehensive test validation

• Tests serve as executable documentation by:

  • Clearly demonstrating input/output relationships
  • Providing quick feedback during development
  • Presenting behavior changes in readable format

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