Run Windows on CI (emotion-js#2341)

* Run Windows on CI

* try to normalize paths passed to source map generator

* Configure auto EOL in git attributes

* Split by path.sep in one of the tests

* Revert "try to normalize paths passed to source map generator"

This reverts commit 603c070.

Author: Andarist

.circleci/config.yml

@@ -1,4 +1,8 @@
-version: 2
+version: 2.1
+
+orbs:
+  win: circleci/windows@2.2.0
+
 jobs:
   flow:
     docker:
@@ -46,6 +50,23 @@ jobs:
       - store_artifacts:
           path: reports/junit
 
+  test_windows:
+    executor: win/default
+    working_directory: ~/repo
+    steps:
+      - checkout
+      - restore_cache:
+          keys:
+            - v4-dependencies-{{ checksum "yarn.lock" }}
+            # fallback to using the latest cache if no exact match is found
+            - v4-dependencies-
+      - run: yarn install --pure-lockfile
+      - run:
+          name: Jest Tests
+          command: yarn coverage --reporters=default --reporters=jest-junit
+          environment:
+            JEST_JUNIT_OUTPUT: 'reports/junit/js-test-results.xml'
+
   test_dist:
     docker:
       - image: circleci/node:12
@@ -85,5 +106,6 @@ workflows:
     jobs:
       - flow
       - test
+      - test_windows
       - test_dist
       - lint_and_typescript

.gitattributes

@@ -0,0 +1 @@
+* text=auto eol=lf

packages/babel-plugin/__tests__/css-requires-options.js

@@ -1,4 +1,5 @@
 // @flow
+import nodePath from 'path'
 import babelTester from 'babel-tester'
 import plugin from '@emotion/babel-plugin'
 
@@ -79,7 +80,7 @@ const cases = {
         {
           labelFormat: ({ name, path }) =>
             `${name.toUpperCase()}_${last(
-              path.replace(/\..+$/, '').split('/')
+              path.replace(/\..+$/, '').split(nodePath.sep)
             ).toUpperCase()}`
         }
       ]