fix tests running

package.json

@@ -52,7 +52,7 @@
     "@vue/babel-helper-vue-jsx-merge-props": "1.2.1",
     "@vue/babel-preset-jsx": "1.2.4",
     "@vue/babel-plugin-jsx": "1.1.1",
-    "@vue/test-utils": "1.0.0-beta.28",
+    "@vue/test-utils": "2.0.0-rc.17",
     "@vue/compiler-sfc": "^3.1.0",
     "autoprefixer": "6.7.7",
     "babel-eslint": "7.2.3",
@@ -85,10 +85,10 @@
     "iso-639-1": "2.1.13",
     "isparta-loader": "2.0.0",
     "json-loader": "0.5.7",
-    "karma": "3.1.4",
+    "karma": "6.3.17",
     "karma-coverage": "1.1.2",
     "karma-firefox-launcher": "1.3.0",
-    "karma-mocha": "1.3.0",
+    "karma-mocha": "2.0.1",
     "karma-mocha-reporter": "2.2.5",
     "karma-sinon-chai": "2.0.2",
     "karma-sourcemap-loader": "0.3.8",

test/unit/index.js

+import { configureCompat } from 'vue'
+// disable compat for certain features
+configureCompat({
+  COMPONENT_V_MODEL: false,
+  INSTANCE_SET: false,
+  RENDER_FUNCTION: false
+})
 // require all test files (files that ends with .spec.js)
 const testsContext = require.context('./specs', true, /\.spec$/)
 testsContext.keys().forEach(testsContext)