diff --git a/packages/@vue/cli-plugin-unit-mocha/__tests__/mochaPlugin.spec.js b/packages/@vue/cli-plugin-unit-mocha/__tests__/mochaPlugin.spec.js
index f17b7a358c..3028406860 100644
--- a/packages/@vue/cli-plugin-unit-mocha/__tests__/mochaPlugin.spec.js
+++ b/packages/@vue/cli-plugin-unit-mocha/__tests__/mochaPlugin.spec.js
@@ -11,3 +11,34 @@ test('should work', async () => {
   })
   await project.run(`vue-cli-service test:unit`)
 })
+
+test('should work with dart-sass on *nix system', async () => {
+  const project = await createOutside('unit-mocha-dart-sass', {
+    cssPreprocessor: 'dart-sass',
+    plugins: {
+      '@vue/cli-plugin-babel': {},
+      '@vue/cli-plugin-unit-mocha': {}
+    }
+  })
+
+  const file = await project.read('src/components/HelloWorld.vue')
+  project.write('src/components/HelloWorld.vue', file.replace(`<style scoped lang="scss">`, `<style scoped lang="scss">\n@use 'bug';`))
+  project.write('src/assets/bug.scss', '')
+  project.write('vue.config.js', `
+const path = require('path')
+
+module.exports = {
+  css: {
+    loaderOptions: {
+      sass: {
+        sassOptions: {
+          includePaths: [path.resolve('src', 'assets')]
+        }
+      }
+    }
+  }
+}
+  `)
+
+  await project.run(`vue-cli-service test:unit`)
+})
diff --git a/packages/@vue/cli-plugin-unit-mocha/setup.js b/packages/@vue/cli-plugin-unit-mocha/setup.js
index df81b0b514..bc605cbf46 100644
--- a/packages/@vue/cli-plugin-unit-mocha/setup.js
+++ b/packages/@vue/cli-plugin-unit-mocha/setup.js
@@ -5,4 +5,9 @@ window.Date = Date
 // https://github.com/vuejs/vue-next/pull/2943
 global.ShadowRoot = window.ShadowRoot
 
+// https://github.com/vuejs/vue-next/issues/3590
 global.SVGElement = window.SVGElement
+
+// https://github.com/vuejs/vue-cli/issues/6427
+// https://github.com/mbullington/node_preamble.dart/issues/26
+process.versions.electron = ''