Switch from the custom unit test harness to TSLint's --test

[JoshuaKGoldberg]

It'd be nice to not have to maintain the custom unit test framework, and instead use the same one as TSLint core's.

[IllusionMH]

I'd like to take on this.

[IllusionMH]

Update on this issue.

After #584 and #616 landed, now all infrastructure tasks are ready to accomplish test migration.

This repo has 92 (soon 93) rules and it will definitely take time to properly migrate all tests. I will do it in several PRs.

If you want to help - you are welcome. Plase leave a comment with list of rules you want to migrate, so we won't do same work.

Progress: 1 of 93

🏃 marks rules that are in batch that I'm working on.

• chai-prefer-contains-to-index-of
• chai-vague-errors
• 🏃‍♂️ export-name
• function-name
• import-name
• informative-docs
• insecure-random
• jquery-deferred-must-complete
• max-func-body-length
• missing-jsdoc
• missing-optional-annotation
• mocha-avoid-only
• mocha-no-side-effect-code
• mocha-unneeded-done
• no-backbone-get-set-outside-model
• no-banned-terms
• no-constant-condition
• no-control-regex
• 🏃‍♂️ no-cookies
• no-delete-expression
• no-disable-auto-sanitization
• no-document-domain
• no-document-write
• no-duplicate-case
• no-duplicate-parameter-names
• no-empty-interfaces
• no-empty-line-after-opening-brace
• no-exec-script
• no-for-in
• 🏃‍♂️ no-function-constructor-with-string-args
• 🏃‍♂️ no-function-expression
• no-http-string
• no-increment-decrement
• no-inner-html
• no-invalid-regexp
• no-jquery-raw-elements
• no-missing-visibility-modifiers
• no-multiline-string
• no-multiple-var-decl
• 🏃‍♂️ no-octal-literal
• no-regex-spaces
• no-relative-imports (IlusionMH)
• 🏃‍♂️ no-reserved-keywords
• no-single-line-block-comment
• no-stateless-class
• 🏃‍♂️ no-string-based-set-immediate
• 🏃‍♂️ no-string-based-set-interval
• 🏃‍♂️ no-string-based-set-timeout
• no-suspicious-comment
• no-typeof-undefined
• no-unexternalized-strings
• no-unnecessary-bind (JoshuaKGoldberg)
• no-unnecessary-field-initialization (JoshuaKGoldberg)
• no-unnecessary-local-variable (JoshuaKGoldberg)
• no-unnecessary-override (JoshuaKGoldberg)
• 🏃‍♂️ no-unnecessary-semicolons
• no-unsupported-browser-code
• no-useless-files (JoshuaKGoldberg)
• no-var-self (JoshuaKGoldberg)
• no-with-statement (JoshuaKGoldberg)
• non-literal-fs-path (JoshuaKGoldberg)
• non-literal-require (JoshuaKGoldberg)
• possible-timing-attack (JoshuaKGoldberg)
• prefer-array-literal (JoshuaKGoldberg)
• 🏃‍♂️ prefer-type-cast
• promise-must-complete (JoshuaKGoldberg)
• react-a11y-anchors
• react-a11y-aria-unsupported-elements
• react-a11y-event-has-role
• react-a11y-image-button-has-alt
• 🏃‍♂️ react-a11y-img-has-alt
• react-a11y-input-elements
• react-a11y-lang
• react-a11y-meta
• react-a11y-no-onchange
• 🏃‍♂️ react-a11y-props
• 🏃‍♂️ react-a11y-proptypes
• react-a11y-required
• 🏃‍♂️ react-a11y-role
• 🏃‍♂️ react-a11y-role-has-required-aria-props
• 🏃‍♂️ react-a11y-role-supports-aria-props
• 🏃‍♂️ react-a11y-tabindex-no-positive
• react-a11y-titles
• react-anchor-blank-noopener
• react-iframe-missing-sandbox
• react-no-dangerous-html
• 🏃‍♂️ react-this-binding-issue
• react-tsx-curly-spacing (JoshuaKGoldberg)
• react-unused-props-and-state
• underscore-consistent-invocation (JoshuaKGoldberg)
• use-named-parameter (JoshuaKGoldberg)
• use-simple-attribute
• valid-typeof (JoshuaKGoldberg)

UPD: Added use-simple-attribute that will be added with #628 to the list

[JoshuaKGoldberg]

I'll roughly start on the rules from the bottom up today, ending somewhere before no-unnecessary-bind, then post the list here.

Edit: #633 covers:

• no-unnecessary-bind
• no-unnecessary-field-initialization
• no-unnecessary-override
• no-useless-files
• no-var-self
• no-with-statement
• non-literal-fs-path-rule
• non-literal-require
• possible-timing-attack
• prefer-array-literal
• promise-must-complete
• react-tsx-curly-spacing
• underscore-consistent-invocation
• unnecessary-local-variable
• use-named-parameter
• valid-typeof

[JoshuaKGoldberg]

Changing the label from Difficulty: Hard to Difficulty: Easy now that the infrastructure (and endline behaviors) have been figured out. 🚀