Increase coverage of tests for IAction.isAction()

[Huddo121]

No description provided.

[mention-bot]

@Huddo121, thanks for your PR! By analyzing the history of the files in this pull request, we identified @egamma, @jrieken and @bpasero to be potential reviewers.

[msftclas]

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[msftclas]

@Huddo121, Thanks for signing the contribution license agreement so quickly! Actual humans will now validate the agreement and then evaluate the PR.

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[jrieken]

LGTM