test(data): add entity action guard tests

[AdditionAddict]

PR Checklist

Please check if your PR fulfills the following requirements:

• [ x ] The commit message follows our guidelines: https://github.com/ngrx/platform/blob/master/CONTRIBUTING.md#commit
• [ x ] Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ x ] Other... Please describe: 

→ added tests

What is the current behavior?

Closes #

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ x ] No

Other information

[ngrxbot]

Preview docs changes for 4a71e7e at https://previews.ngrx.io/pr2390-4a71e7e/

[brandonroberts]

These should import from their internal location instead of the root.