(refactor): move manual tests into integration test dir

- move build-withConfig into integration-tests/fixtures/
  - move its package.json deps into root devDeps
    - it's much easier to work with this way vs. as subdirectories
      with separate package.json and node_modules
      - and consistent with how the E2E tests work too
    - (deps): remove eslint-config-postcss as it wasn't used anyway

- move fixtures/ to test/fixtures as they're specific to E2E tests

- move test/jest.config.json to root jest.config.js
  - so it's used by default, no need for --config
- significantly simplify jest.config.js now that it's in root too
  - and the simplification allows it to be used for both test dirs

(docs): update fixtures README to remove "manual" references
(docs): reword all mentions of tests to say E2E tests
- that's what they currently are, though I'd like to refactor many to
  be unit tests
(docs): add tests README and integration test fixtures README

jest.config.js

@@ -0,0 +1,10 @@
+module.exports = {
+  testEnvironment: 'node',
+  testMatch: [
+    '<rootDir>/**/*(*.)@(test).[tj]s?(x)'
+  ],
+  testPathIgnorePatterns: [
+    '/node_modules/', // default
+    '<rootDir>/templates/' // don't run tests in the templates
+  ]
+}

package.json

@@ -26,7 +26,7 @@
     "lint": "yarn build && yarn lint:post-build",
     "lint:post-build": "node dist/index.js lint src test --ignore-pattern 'test/tests/lint'",
     "test": "yarn build && yarn test:post-build",
-    "test:post-build": "node dist/index.js test --config ./test/jest.config.json",
+    "test:post-build": "node dist/index.js test",
     "start": "tsc -p tsconfig.json --watch",
     "release": "np"
   },
@@ -112,13 +112,18 @@
     "@types/rollup-plugin-sourcemaps": "^0.4.2",
     "@types/sade": "^1.6.0",
     "@types/semver": "^7.1.0",
+    "autoprefixer": "^9.7.4",
+    "cssnano": "^4.1.10",
     "doctoc": "^1.4.0",
     "husky": "^4.2.2",
     "np": "^6.2.0",
     "pretty-quick": "^2.0.0",
     "ps-tree": "^1.2.0",
     "react": "^16.8.6",
-    "semver": "^7.1.1"
+    "rollup-plugin-postcss": "^2.5.0",
+    "semver": "^7.1.1",
+    "tiny-invariant": "^1.1.0",
+    "tiny-warning": "^1.0.3"
   },
   "husky": {
     "hooks": {

test/README.md

@@ -0,0 +1,6 @@
+# Tests
+
+There are two main directories here:
+
+- `tests` contains end-to-end (E2E) tests of the CLI
+- `integration-tests` contains tests ensuring that common or recommended plugins work properly together with TSDX