Need support to write unit test cases for custom sort using react enzyme (jest)

[AravindRavi95]

If we have a custom sort in added to the data column(below is an example). Kindly suggest on how to cover it in the unit testing.

{
title: 'Class Start',
field: 'classStart',
customSort: (a, b) => new Date(a.start).getTime() - new Date(b.start).getTime()
}

We are working with react + enzyme for unit testcase.

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