Add test for Date.isBetween

[kaphacius]

Added a missing test for Date.isBetween extension method

Checklist

• I checked the Contributing Guidelines before creating this request.
• New extensions are written in Swift 4.
• New extensions support iOS 8.0+ / tvOS 9.0+ / macOS 10.10+ / watchOS 2.0+.
• I have added tests for new extensions, and they passed.
• All extensions have a clear comments explaining their functionality, all parameters and return type in English.
• All extensions are declared as public.

[SwifterSwiftBot]

	1 Message
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[codecov]

Codecov Report

Merging #289 into master will increase coverage by 0.09%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
+ Coverage   94.41%   94.51%   +0.09%     
==========================================
  Files          99       99              
  Lines        5494     5503       +9     
==========================================
+ Hits         5187     5201      +14     
+ Misses        307      302       -5

Flag	Coverage Δ
#ios	94.3% <100%> (+0.1%)	⬆️
#osx	60.82% <100%> (+0.15%)	⬆️
#tvos	89.22% <100%> (+0.11%)	⬆️

Impacted Files	Coverage Δ
Tests/FoundationTests/DateExtensionsTests.swift	94.79% <100%> (+0.08%)	⬆️
Sources/Extensions/Foundation/DateExtensions.swift	100% <0%> (+1.71%)	⬆️

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[omaralbeik]

Thanks @kaphacius 👍