Fix false-positive lint errors for tests

.eslintrc.js

@@ -2,6 +2,7 @@ module.exports = {
   env: {
     browser: true,
     es6: true,
+    jest: true,
   },
   extends: ['eslint:recommended', 'plugin:react/recommended', 'plugin:prettier/recommended'],
   settings: {
@@ -10,8 +11,10 @@ module.exports = {
     },
   },
   globals: {
-    Atomics: 'readonly',
-    SharedArrayBuffer: 'readonly',
+    shallow: true,
+    render: true,
+    mount: true,
+    global: true,
   },
   parser: 'babel-eslint',
   parserOptions: {