test(integration-karma): add listener memoization tests #4480
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Details
This adds Karma tests for event listener memoization, which came up when I was reviewing #4468.
This behavior is a little subtle, and previously we were only really testing it in the template-compiler snapshot tests here:
lwc/packages/@lwc/template-compiler/src/__tests__/fixtures/regression/handler-memoization/actual.html
Lines 4 to 9 in 39af4df
Adding the test ensures we don't regress the current functionality.
Does this pull request introduce a breaking change?
Does this pull request introduce an observable change?