Add Test

[azu]

Currently, No test code.

editor/package.json

Line 32 in d6506f6

"test": "echo 'no test' && exit 0;",

We need to add some test cases.

• @textlint/compiler - snapshot testing
  • code generator match snapshot testing
  • https://efcl.info/2018/02/02/snapshot-test/
• @textlint/config-loader - unit test and snapshot testing
  • It will be moved to textlint core
• textchecker-element - cypress?
  • We want to detect visual regression?
• webextension - How?

Probably, we need to add textchecker-element wrapper.
Because, textchecker-element example and webextension's contentscript use almost same code base.