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Day.js Testing – Jest Unit Testing Implementation

The dayjs library's testing suite demonstrates a comprehensive unit testing approach using Jest as the primary testing framework. The test suite includes 92 test cases covering core utilities, plugin functionality, and locale-specific features, with particular attention to datetime manipulation, formatting operations, and TypeScript declarations verification. Qodo Tests Hub provides developers with detailed insights into dayjs's testing patterns, making it easier to understand how to effectively test datetime libraries. Through the platform, developers can explore real-world examples of Jest unit tests, examine timezone handling implementations, and learn best practices for testing internationalization features. This practical knowledge helps teams implement more robust testing strategies in their own projects.

Path	Test Type	Language	Description
test/locale/et.test.js	unit	javascript	This Jest unit test verifies Estonian locale relative time formatting in Day.js against Moment.js reference implementation.
test/locale/he.test.js	unit	javascript	This Jest unit test verifies Hebrew locale relative time formatting in dayjs against moment.js reference implementation.
test/locale/hu.test.js	unit	javascript	This Jest unit test verifies Hungarian locale relative time formatting functionality in dayjs compared to moment.js implementation.
test/locale/ja.test.js	unit	javascript	This Jest unit test verifies Japanese locale relative time formatting in Day.js with moment.js compatibility
test/locale/ku.test.js	unit	javascript	This Jest unit test verifies Kurdish locale formatting and parsing functionality in the Day.js library.
test/locale/lt.test.js	unit	javascript	This Jest unit test verifies Lithuanian locale date formatting functionality in Day.js by comparing against Moment.js reference implementation.
test/locale/ru.test.js	unit	javascript	This Jest unit test verifies Russian locale functionality including date formatting, relative time, and meridiem handling in dayjs library.
test/locale/sl.test.js	unit	javascript	This Jest unit test verifies Slovenian locale relative time formatting in both past and future contexts for Day.js library.
test/locale/sr-cyrl.test.js	unit	javascript	This Jest unit test verifies Serbian Cyrillic locale relative time formatting in Day.js library.
test/locale/sv.test.js	unit	javascript	This Jest unit test verifies Swedish locale date formatting functionality in Day.js, particularly ordinal number handling.