Fix SAX and Visvalingam tests.

[avilchess]

Make sure you have checked all steps below.

Description

• Here are some details about my PR, including screenshots of any UI changes:

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• My commits have been squashed if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

License

• Add a Mozilla Public License 2.0 license header to all the new files.

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it.

[codecov]

Codecov Report

Merging #45 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #45 +/- ## ======================================= Coverage 94.56% 94.56% ======================================= Files 14 14 Lines 865 865 ======================================= Hits 818 818 Misses 47 47

Flag	Coverage Δ
#Linux	93.29% <ø> (ø)	⬆️
#MacOS	93.06% <ø> (ø)	⬆️
#Windows	94.21% <ø> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d8be671...d602406. Read the comment docs.

[dcuestam]

OK