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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