Load CSS in Jest tests

Author: iddan

package.json

@@ -41,6 +41,7 @@
     "use-context-selector": "^1.3.7"
   },
   "devDependencies": {
+    "jest-transform-css": "^3.0.0",
     "@babel/core": "^7.16.5",
     "@storybook/addon-actions": "^6.4.9",
     "@storybook/addon-essentials": "^6.4.9",
@@ -94,12 +95,12 @@
     "testPathIgnorePatterns": [
       "dist"
     ],
-    "moduleNameMapper": {
-      "\\.css$": "<rootDir>/src/__mocks__/style-mock.ts"
-    },
     "setupFilesAfterEnv": [
       "<rootDir>/src/jest-setup.ts"
-    ]
+    ],
+    "transform": {
+      "^.+\\.css$": "jest-transform-css"
+    }
   },
   "eslintConfig": {
     "parser": "@typescript-eslint/parser",