Merge #14935: tests: Test for expected return values when calling functions returning a success code

c84c2b8c92 tests: Test for expected return values when calling functions returning a success code (practicalswift)

Pull request description:

  Test for expected return values when calling functions returning a success code (instead of discarding the return values).

  **Note to reviewers:** The following commands can be used to verify that the only text fragments added in this PR are `BOOST_CHECK(`, `!` and `)` :

  ```
  $ git diff HEAD~1 | grep -E '^[\-][^\-]' | cut -b2- > before.txt
  $ git diff HEAD~1 | grep -E '^[\+][^\+]' | cut -b2- > after.txt
  $ cat after.txt | sed 's/BOOST_CHECK(//g' | sed 's/));/);/g' | tr -d '!' > after-sed.txt
  $ diff -u before.txt after-sed.txt
  $
  ```

Tree-SHA512: ff0863ef2046a2eda3c44e9c6b9aedfe167881f2fa58db29fef859416831233ef6502a3a11fd2322bc1a924db83df8d4a5c5879298007f2a7b085e2a7286af70

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