Enable the exhaustive test tool for parsePerseusItem to test articles.

[benchristel]

This will help us find data issues where article content contains invalid or
strangely-shaped Perseus data.

Issue: LEMS-2582

Test plan:

Run the exhaustive test tool on a content snapshot that includes articles.

You should get 14 errors:

(root).question.widgets["interactive-graph N"].options.lockedFigures[N].size -- expected "small", "medium", "large"; got undefined
(root).question.widgets["grapher N"].options.correct.coords -- expected array; got null
(root).question.widgets["explanation N"][N] -- expected numeric string; got string
(root).question.widgets["image N"][N] -- expected numeric string; got string
(root).question.widgets["interactive-graph N"].options.lockedFigures[N].text -- expected string; got undefined
(root).question.widgets["interaction N"].options.elements[N].key -- expected string; got undefined
(root).question.widgets["cs-program N"].options.width -- expected number; got null
(root).question.widgets["iframe N"].options.allowFullScreen -- expected boolean; got undefined
(root).question.widgets["example-graphie-widget N"] -- expected a valid widget type; got string
(root).question.widgets["interactive-graph N"].options.lockedFigures[N].coord -- expected array; got undefined
(root).question.widgets["interactive-graph N"].options.lockedFigures[N].type -- expected "label"; got string
(root).question.widgets["explanation N"].options.widgets["image N"][N] -- expected numeric string; got string
(root).question.widgets["iframe N"].options.settings -- expected array; got undefined
(root).question.widgets["graded-group N"].options.widgets["numeric-input N"].options.answers[N].answerForms[N] -- expected "integer", "mixed", "improper", "proper", "decimal", "percent", "pi"; got string

[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (9141024) and published it to npm. You
can install it using the tag PR2077.

Example:

yarn add @khanacademy/perseus@PR2077

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR2077

[github-actions]

Size Change: 0 B

Total Size: 1.47 MB

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	39 kB
packages/keypad-context/dist/es/index.js	760 B
packages/kmath/dist/es/index.js	83.1 kB
packages/math-input/dist/es/index.js	78 kB
packages/math-input/dist/es/strings.js	1.79 kB
packages/perseus-core/dist/es/index.js	23.1 kB
packages/perseus-editor/dist/es/index.js	689 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus-score/dist/es/index.js	103 kB
packages/perseus/dist/es/index.js	411 kB
packages/perseus/dist/es/strings.js	4.82 kB
packages/pure-markdown/dist/es/index.js	3.66 kB
packages/simple-markdown/dist/es/index.js	12.5 kB

_{compressed-size-action}

[benchristel]

I wasn't sure what the superclass / hypernym of "article" and "assessment item" is, so I went with "content item". Not sure if that's right or if there's a better term.

[jeremywiebe]

Content Item feels like a good choice! :)