[v2] More test updates

[m-allanson]

Getting closer! I'll pick this up again tomorrow. See commits for details.

Previously:

Test Suites: 10 failed, 68 passed, 78 total
Tests:       11 failed, 4 skipped, 516 passed, 531 total
Snapshots:   4 failed, 211 passed, 215 total
Time:        20.828s
Ran all test suites.

Now:

Test Suites: 4 failed, 69 passed, 73 total
Tests:       1 failed, 3 skipped, 480 passed, 484 total
Snapshots:   200 passed, 200 total
Time:        21.513s, estimated 23s
Ran all test suites.

Note the reduced number of total tests, I think this is because the bootstrap process was compiling some tests which jest was then running.

Failing output now is:

Summary of all failing tests
 FAIL  packages/gatsby-source-contentful/src/__tests__/normalize.js
  ● Process contentful data › creates nodes for each entry

    ReferenceError: prepareTextNode is not defined

      334 |         ).type
      335 |         if (fieldType === `Text`) {
    > 336 |           const textNode = prepareTextNode(
      337 |             entryNode,
      338 |             entryItemFieldKey,
      339 |             entryItemFields[entryItemFieldKey],

      at Object.keys.forEach.entryItemFieldKey (packages/gatsby-source-contentful/src/normalize.js:336:28)
          at Array.forEach (<anonymous>)
      at entries.map.entryItem (packages/gatsby-source-contentful/src/normalize.js:322:36)
          at Array.map (<anonymous>)
      at locales.forEach.locale (packages/gatsby-source-contentful/src/normalize.js:224:32)
          at Array.forEach (<anonymous>)
      at Object.<anonymous>.exports.createContentTypeNodes (packages/gatsby-source-contentful/src/normalize.js:205:11)
      at contentTypeItems.forEach (packages/gatsby-source-contentful/src/__tests__/normalize.js:58:17)
          at Array.forEach (<anonymous>)
      at Object.it (packages/gatsby-source-contentful/src/__tests__/normalize.js:57:22)

 FAIL  packages/gatsby-plugin-less/src/__tests__/gatsby-node.js
  ● Test suite failed to run

    Your test suite must contain at least one test.

      at node_modules/jest-cli/build/test_scheduler.js:157:22

 FAIL  packages/gatsby-1-config-extract-plugin/src/__tests__/index.js
  ● Test suite failed to run

    Cannot find module 'webpack/lib/removeAndDo' from 'ExtractedModule.js'

      at Resolver.resolveModule (node_modules/jest-resolve/build/index.js:169:17)
      at Object.<anonymous> (node_modules/extract-text-webpack-plugin/ExtractedModule.js:30:42)

 FAIL  packages/gatsby-plugin-sass/src/__tests__/gatsby-node.js
  ● Test suite failed to run

    Your test suite must contain at least one test.

      at node_modules/jest-cli/build/test_scheduler.js:157:22

[KyleAMathews]

Looks great!