Improving date picker test case as per customer use-case

[rismehta]

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] I have signed the Adobe Open Source CLA.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes and the overall coverage did not decrease.
• [ ] All unit tests pass on CircleCi.
• [ ] I ran all tests locally and they pass.

[adobe-bot]

Lighthouse scores (desktop)

	Performance	Accessibility	Best-Practices	SEO
Scores	100	96	100	75

[adobe-bot]

Lighthouse scores (mobile)

	Performance	Accessibility	Best-Practices	SEO
Scores	92	96	100	75

[adobe-bot]

Accessibility Violations Found

Id	Impact
label-title-only	serious
target-size	serious

[adobe-bot]

Accessibility Violations Found

Id	Impact
label-title-only	serious
target-size	serious

[adobe-bot]

Accessibility Violations Found

Id	Impact
label-title-only	serious
target-size	serious

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.58%. Comparing base (d92ce31) to head (d25ee66).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #1299 +/- ## ========================================= Coverage 81.58% 81.58% Complexity 847 847 ========================================= Files 96 96 Lines 2259 2259 Branches 306 306 ========================================= Hits 1843 1843 Misses 257 257 Partials 159 159 ```

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