Update Tests to testthat 3E

[emstruong]

There are various changes made to testthat 3E that should make our tests more robust and parsimonious.

For example, expect_equal() now supersedes expect_equivalent() -- and more easily specifies the level of tolerance.

• [ ] test-assess.R is one file that may benefit from this update.
• [ ] Add additional tests for testthat
• [ ] normal mixture of composite and composites.
• [ ] empirical example (not population data
• [ ] cover different types of second-order constructs
• [ ] Parallelize Tests

[FloSchuberth]

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