Update test suite based on v5

[Download]

No need to fix all tests yet. Instead just create issues for them and people might be able to lend us a hand in fixing them.

• Copy tests from nfl/react-helmet v5
• Change build scripts to use the new tests
• Remove old tests
• Change tests to depend on Preact i.s.o on React

[Download]

We need to change the tests to depend on Preact

Because this hasn't been done yet the tests don't even transpile a.t.m. until we fix this.

TEST RESULTS AFTER UPDATE

C:\ws\preact-helmet>npm test

> preact-helmet@5.0.0-alpha-1 pretest C:\ws\preact-helmet
> npm run clean && npm run lint && npm run compile

npm WARN invalid config loglevel="notice"

> preact-helmet@5.0.0-alpha-1 clean C:\ws\preact-helmet
> rimraf lib build es

npm WARN invalid config loglevel="notice"

> preact-helmet@5.0.0-alpha-1 lint C:\ws\preact-helmet
> eslint --ignore-path .gitignore -- .

C:\ws\preact-helmet\test\HelmetDeclarativeTest.js
   5:19  error  Unable to resolve path to module 'react'                  import/no-unresolved
   6:22  error  Unable to resolve path to module 'react-dom'              import/no-unresolved
   7:25  error  Unable to resolve path to module 'react-dom/server'       import/no-unresolved
   8:9   error  Helmet not found in '../src/Helmet'                       import/named
   9:9   error  HTML_TAG_MAP not found in '../src/HelmetConstants'        import/named
  10:35  error  Unable to resolve path to module '../src/HelmetUtils.js'  import/no-unresolved

C:\ws\preact-helmet\test\HelmetTest.js
  4:19  error  Unable to resolve path to module 'react'                  import/no-unresolved
  5:22  error  Unable to resolve path to module 'react-dom'              import/no-unresolved
  6:25  error  Unable to resolve path to module 'react-dom/server'       import/no-unresolved
  7:9   error  Helmet not found in '../src/Helmet'                       import/named
  8:35  error  Unable to resolve path to module '../src/HelmetUtils.js'  import/no-unresolved

✖ 11 problems (11 errors, 0 warnings)

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! preact-helmet@5.0.0-alpha-1 lint: `eslint --ignore-path .gitignore -- .`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the preact-helmet@5.0.0-alpha-1 lint script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Frank\AppData\Roaming\npm-cache\_logs\2017-07-25T21_00_34_759Z-debug.log
npm ERR! Test failed.  See above for more details.