From fc88c25c25f39bf5dc226e23f2d32b5afc3fac7b Mon Sep 17 00:00:00 2001
From: Kelly <kellymartinv@gmail.com>
Date: Mon, 5 Feb 2018 10:16:17 -0600
Subject: [PATCH 1/2] fix: allow plugins to be re-installed in localVue
 instance

closes #406
---
 src/create-local-vue.js             |  1 +
 test/specs/create-local-vue.spec.js | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/src/create-local-vue.js b/src/create-local-vue.js
index 2eb2ba730..d9733adad 100644
--- a/src/create-local-vue.js
+++ b/src/create-local-vue.js
@@ -32,6 +32,7 @@ function createLocalVue (): Component {
   instance.options._base = instance
 
   // compat for vue-router < 2.7.1 where it does not allow multiple installs
+  instance._installedPlugins = []
   const use = instance.use
   instance.use = (plugin, ...rest) => {
     if (plugin.installed === true) {
diff --git a/test/specs/create-local-vue.spec.js b/test/specs/create-local-vue.spec.js
index c9aa8e92b..6ef72a336 100644
--- a/test/specs/create-local-vue.spec.js
+++ b/test/specs/create-local-vue.spec.js
@@ -1,4 +1,5 @@
 import { createLocalVue } from '~vue-test-utils'
+import Vue from 'vue'
 import Vuex from 'vuex'
 import Vuetify from 'vuetify'
 import VueRouter from 'vue-router'
@@ -113,6 +114,23 @@ describe('createLocalVue', () => {
     localVue.use(Vuetify)
   })
 
+  it('installs plugin into local Vue regardless of previous install in Vue', () => {
+    let installCount = 0
+
+    class Plugin {}
+    Plugin.install = function (_Vue) {
+      expect(_Vue._installedPlugins.indexOf(Plugin)).to.equal(-1)
+      installCount++
+    }
+
+    Vue.use(Plugin)
+    const localVue = createLocalVue()
+    localVue.use(Plugin)
+
+    expect(localVue._installedPlugins.indexOf(Plugin)).to.equal(0)
+    expect(installCount).to.equal(2)
+  })
+
   it('has an errorHandler', () => {
     const localVue = createLocalVue()
 

From 421109b18a75bfda3ea87aeb0c7ba8a2715f3cdb Mon Sep 17 00:00:00 2001
From: Kelly <kellymartinv@gmail.com>
Date: Mon, 5 Feb 2018 13:20:53 -0600
Subject: [PATCH 2/2] Add support for Vue 2.0.x

---
 src/create-local-vue.js             | 4 +++-
 test/specs/create-local-vue.spec.js | 8 ++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/create-local-vue.js b/src/create-local-vue.js
index d9733adad..df69c590e 100644
--- a/src/create-local-vue.js
+++ b/src/create-local-vue.js
@@ -32,7 +32,9 @@ function createLocalVue (): Component {
   instance.options._base = instance
 
   // compat for vue-router < 2.7.1 where it does not allow multiple installs
-  instance._installedPlugins = []
+  if (instance._installedPlugins && instance._installedPlugins.length) {
+    instance._installedPlugins.length = 0
+  }
   const use = instance.use
   instance.use = (plugin, ...rest) => {
     if (plugin.installed === true) {
diff --git a/test/specs/create-local-vue.spec.js b/test/specs/create-local-vue.spec.js
index 6ef72a336..a9a822839 100644
--- a/test/specs/create-local-vue.spec.js
+++ b/test/specs/create-local-vue.spec.js
@@ -119,7 +119,9 @@ describe('createLocalVue', () => {
 
     class Plugin {}
     Plugin.install = function (_Vue) {
-      expect(_Vue._installedPlugins.indexOf(Plugin)).to.equal(-1)
+      if (_Vue._installedPlugins) {
+        expect(_Vue._installedPlugins.indexOf(Plugin)).to.equal(-1)
+      }
       installCount++
     }
 
@@ -127,7 +129,9 @@ describe('createLocalVue', () => {
     const localVue = createLocalVue()
     localVue.use(Plugin)
 
-    expect(localVue._installedPlugins.indexOf(Plugin)).to.equal(0)
+    if (localVue._installedPlugins) {
+      expect(localVue._installedPlugins.indexOf(Plugin)).to.equal(0)
+    }
     expect(installCount).to.equal(2)
   })