Install "ESLint" import resolver for "Jest"

To allow aliased imports in tests with Jest, ESLint must be aware of the
"modulePath" field of the "jest.config.js" file. The installed ESLint
plugin allows to define the path to the config file so ESLint can
resolve used paths in tests.
This is used for test util functions.

Associated epic: GH-38
GH-64

.eslintrc.js

@@ -34,6 +34,9 @@ module.exports = {
   },
   settings: {
     "import/resolver": {
+      jest: {
+        jestConfigFile: resolve(__dirname, "jest.config.js")
+      },
       node: {
         /* Resolve Webpack alias imports */
         paths: [resolve(__dirname, "src"), resolve(__dirname, "src/components")]

jest.config.js

@@ -53,6 +53,7 @@ module.exports = {
     "^data(.*)$": "<rootDir>/src/data$1",
     "^layouts(.*)$": "<rootDir>/src/components/layouts$1",
     "^molecules(.*)$": "<rootDir>/src/components/molecules$1",
+    "^nord-docs-test-utils(.*)$": "<rootDir>/test/__utils__$1",
     "^organisms(.*)$": "<rootDir>/src/components/organisms$1",
     "^pages(.*)$": "<rootDir>/src/pages$1",
     "^stores(.*)$": "<rootDir>/src/stores$1",

package.json

@@ -61,6 +61,7 @@
     "del-cli": "1.1.0",
     "eslint": "5.9.0",
     "eslint-config-arcticicestudio": ">=0.4.0 <1.0.0",
+    "eslint-import-resolver-jest": "2.1.1",
     "eslint-plugin-babel": "5.3.0",
     "eslint-plugin-import": "2.14.0",
     "eslint-plugin-jsx-a11y": "6.1.2",