HM-48. Внедрена система тестирования jest (#17)

.eslintrc.json

@@ -2,13 +2,11 @@
     "parser": "babel-eslint",
     "env": {
         "browser": true,
-        "es2020": true
+        "es2020": true,
+        "jest/globals": true
     },
-    "extends": [
-        "eslint:recommended",
-        "plugin:import/errors",
-        "plugin:import/warnings"
-    ],
+    "extends": ["eslint:recommended", "plugin:import/errors", "plugin:import/warnings", "plugin:jest/recommended"],
+    "plugins": ["jest"],
     "parserOptions": {
         "ecmaVersion": 11,
         "sourceType": "module"
@@ -72,17 +70,17 @@
         "multiline-comment-style": ["warn", "starred-block"],
         "new-cap": "warn",
         "new-parens": "warn",
-        "newline-per-chained-call": ["warn", { "ignoreChainWithDepth": 1 }],
+        "newline-per-chained-call": ["warn", {"ignoreChainWithDepth": 1}],
         "no-bitwise": "warn",
         "no-inline-comments": "warn",
         "no-lonely-if": "warn",
         "no-multi-assign": "warn",
-        "no-multiple-empty-lines": ["warn", { "max": 1}],
+        "no-multiple-empty-lines": ["warn", {"max": 1}],
         "no-nested-ternary": "warn",
         "no-plusplus": "warn",
         "object-curly-spacing": ["warn", "never"],
-        "object-property-newline": ["warn", { "allowAllPropertiesOnSameLine": true }],
-        "key-spacing": ["warn", { "beforeColon": false, "afterColon": true }],
+        "object-property-newline": ["warn", {"allowAllPropertiesOnSameLine": true}],
+        "key-spacing": ["warn", {"beforeColon": false, "afterColon": true}],
         "space-before-blocks": "warn",
         "space-before-function-paren": ["warn", "always"],
         "space-in-parens": ["warn", "never"],