test(react): increase coverage for DatePicker

[adamalston]

No issue.

Increased test coverage for DatePicker and deleted dead code.

Changelog

Changed

• Increased test coverage for DatePicker.

Removed

• Deleted dead code in DatePicker.

Testing / Reviewing

I deleted dead code:

• calendar.selectedDates comes from Flatpickr and is always an array, so if (!calendar.selectedDates) return; is redundant.
• Two effects both clear the calendar when value is reset to an empty value. The uncovered clear appears to be redundant because the earlier effect already handles the same case.
  

  carbon/packages/react/src/components/DatePicker/DatePicker.tsx

  Line 944 in b4297c5

  calendarRef.current.clear();

yarn test --coverage \
  --runTestsByPath packages/react/src/components/DatePicker/DatePicker-test.js \
  --collectCoverageFrom=packages/react/src/components/DatePicker/DatePicker.tsx

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

• Reviewed every line of the diff
• Updated documentation and storybook examples
• Wrote passing tests that cover this change
• Addressed any impact on accessibility (a11y)
• Tested for cross-browser consistency
• Validated that this code is ready for review and status checks should pass

More details can be found in the pull request guide

[netlify]

✅ Deploy Preview for v11-carbon-web-components ready!

Name	Link
🔨 Latest commit	3cded90
🔍 Latest deploy log	https://app.netlify.com/projects/v11-carbon-web-components/deploys/69e7a53e258bfe0008afbf97
😎 Deploy Preview	https://deploy-preview-21833--v11-carbon-web-components.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for v11-carbon-react ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	3cded90
🔍 Latest deploy log	https://app.netlify.com/projects/v11-carbon-react/deploys/69e7a53e8244800008bcfc62
😎 Deploy Preview	https://deploy-preview-21833--v11-carbon-react.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.04%. Comparing base (0df8173) to head (3cded90).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21833      +/-   ##
==========================================
+ Coverage   95.01%   95.04%   +0.03%     
==========================================
  Files         538      538              
  Lines       44982    44975       -7     
  Branches     6459     6508      +49     
==========================================
+ Hits        42739    42747       +8     
+ Misses       2114     2099      -15     
  Partials      129      129              

Flag	Coverage Δ
main-packages	89.12% <100.00%> (+0.09%)	⬆️
web-components	97.86% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[heloiselui]

LGTM!