test: fix SCSS & CSS file handling

Author: Jakub Freisler

jest.config.js

@@ -15,5 +15,8 @@ module.exports = {
       lines: 100,
       statements: 100
     }
+  },
+  moduleNameMapper: {
+    '^.+\\.(css|scss)$': 'identity-obj-proxy'
   }
 };

package.json

@@ -60,6 +60,7 @@
     "eslint-plugin-jest": "^24.1.3",
     "eslint-plugin-monorepo": "^0.3.2",
     "husky": "^4.3.7",
+    "identity-obj-proxy": "^3.0.0",
     "jest": "^26.6.3",
     "lerna": "^3.22.1",
     "microbundle": "^0.13.0",

yarn.lock

@@ -7564,6 +7564,11 @@ hard-rejection@^2.1.0:
   resolved "https://registry.yarnpkg.com/hard-rejection/-/hard-rejection-2.1.0.tgz#1c6eda5c1685c63942766d79bb40ae773cecd883"
   integrity sha512-VIZB+ibDhx7ObhAe7OVtoEbuP4h/MuOTHJ+J8h/eBXotJYl0fBgR72xDFCKgIh22OJZIOVNxBMWuhAr10r8HdA==
 
+harmony-reflect@^1.4.6:
+  version "1.6.1"
+  resolved "https://registry.yarnpkg.com/harmony-reflect/-/harmony-reflect-1.6.1.tgz#c108d4f2bb451efef7a37861fdbdae72c9bdefa9"
+  integrity sha512-WJTeyp0JzGtHcuMsi7rw2VwtkvLa+JyfEKJCFyfcS0+CDkjQ5lHPu7zEhFZP+PDSRrEgXa5Ah0l1MbgbE41XjA==
+
 has-ansi@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/has-ansi/-/has-ansi-2.0.0.tgz#34f5049ce1ecdf2b0649af3ef24e45ed35416d91"
@@ -8044,6 +8049,13 @@ icss-utils@^5.0.0:
   resolved "https://registry.yarnpkg.com/icss-utils/-/icss-utils-5.1.0.tgz#c6be6858abd013d768e98366ae47e25d5887b1ae"
   integrity sha512-soFhflCVWLfRNOPU3iv5Z9VUdT44xFRbzjLsEzSr5AQmgqPMTHdU3PMT1Cf1ssx8fLNJDA1juftYl+PUcv3MqA==
 
+identity-obj-proxy@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/identity-obj-proxy/-/identity-obj-proxy-3.0.0.tgz#94d2bda96084453ef36fbc5aaec37e0f79f1fc14"
+  integrity sha1-lNK9qWCERT7zb7xarsN+D3nx/BQ=
+  dependencies:
+    harmony-reflect "^1.4.6"
+
 ieee754@^1.1.13, ieee754@^1.1.4:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/ieee754/-/ieee754-1.2.1.tgz#8eb7a10a63fff25d15a57b001586d177d1b0d352"