ANIKET KUMAR NISHAD — R50-T034: Test an invariant of octalToDecimal (OctToDecimal.js) [Conversions/OctToDecimal.js] #34

Student: ANIKET KUMAR NISHAD

Task: R50-T034 · 4 of 10
Repository: https://github.com/S-AI-Projects/TheAlgorithms-JavaScript
Assigned working branch: student/e26b07f0789

Goal

Work on Conversions/OctToDecimal.js. Add a property test around octalToDecimal: Preserve the documented output type, shape, ordering and input-mutation behavior; compare fresh equivalent inputs under controlled external state. Fixture: Use the smallest valid input and one ordinary input for octalToDecimal from Conversions/OctToDecimal.js. Write the literal inputs and independently calculated expected outputs in the tests before editing the implementation. The check must name the source line establishing each precondition.

Steps

1. Read Conversions/OctToDecimal.js, especially octalToDecimal near line 1. Record its public inputs, result, mutation behavior and any external dependencies before changing it.
2. Use the fixture to establish the invariant on understandable examples. Use the smallest valid input and one ordinary input for octalToDecimal from Conversions/OctToDecimal.js. Write the literal inputs and independently calculated expected outputs in the tests before editing the implementation. The check must name the source line establishing each precondition.
3. Generate at least 100 bounded valid cases with a fixed seed; restrict the generator to the actual input domain and retain a readable small case.
4. Implement work/R50-T034/check.py as a focused runner that executes the new checks and propagates failures. Native check to incorporate: run the repository test script in non-watch mode after installing from its lockfile; for browser-only code use a browser test instead of plain Node. Record the actual command and nonzero test count.
5. Create the checks specified below and run python3 work/R50-T034/check.py. Save inputs, expected versus actual results and tool versions in work/R50-T034/; a check must exit non-zero when an assertion fails.
6. Commit the repository change on branch R50-T034; prepare a PR to the organisation fork explaining the result and linking the checks. Keep each task independently reviewable. Remove work/R50-T034/ from a later upstream branch.

Done when

☐ The checked behavior is tied to octalToDecimal in Conversions/OctToDecimal.js; every assertion has an explicit expected value.
☐ Use the smallest valid input and one ordinary input for octalToDecimal from Conversions/OctToDecimal.js. Write the literal inputs and independently calculated expected outputs in the tests before editing the implementation. The check must name the source line establishing each precondition.
☐ Existing supported behavior and the public interface are preserved unless a failing regression demonstrates and documents a defect.
☐ The generator never relies on undefined input behavior; the invariant is justified in the PR.
☐ The checks fail when the relevant invariant is deliberately broken in a temporary copy.

Additional task guidance

Additional curated task guidance

Item:
Conversions/OctToDecimal.js

Task type:
Invariant/property checks

Code change (goes into the PR):
Add invariant-based tests for Conversions/OctToDecimal.js, with a deterministic seed and the smallest failing example; document the invariant next to the implementation.

Automated check:
python3 work/R50-T034/check.py

Prerequisites:
Node matching the project engines/CI, package manager selected by its lockfile, and Python 3.

Upstream PR rules:
Preserve the repository JavaScript style, use its test framework, and include JSDoc for changed public behavior. Submit coursework to the organisation fork first; keep work/ evidence out of any later upstream PR. Upstream acceptance is not a grading requirement. Policy: https://github.com/TheAlgorithms/JavaScript/blob/5c39e87a9a31f279c60f830ad74a845e4788a517/CONTRIBUTING.md

Source (pinned):
https://github.com/TheAlgorithms/JavaScript/blob/5c39e87a9a31f279c60f830ad74a845e4788a517/Conversions/OctToDecimal.js#L1

Change:
Replaces the shared task template with an item-specific contribution brief.

PR destination:
Upstream candidate after review

Submission checklist

• Complete this task and its checks.
• Add the required evidence and link your pull request here.
• Select this S-AI-Projects fork as the PR base repository.
• Request instructor review.

Keep this PR focused on this task. Do not submit assignment PRs to the upstream repository.