From 8ab63b445174e2fe0e5c28963acd6228d7d6fb41 Mon Sep 17 00:00:00 2001
From: pimlie <pimlie@hotmail.com>
Date: Sun, 9 Jun 2019 20:44:42 +0200
Subject: [PATCH] test: prevent plugin install twice

---
 src/browser.js                   |  1 -
 src/index.js                     |  1 -
 test/unit/plugin-browser.test.js | 12 ++++++++++++
 test/unit/plugin-server.test.js  | 12 ++++++++++++
 4 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/src/browser.js b/src/browser.js
index 3891522..63b645e 100644
--- a/src/browser.js
+++ b/src/browser.js
@@ -13,7 +13,6 @@ function install(Vue, options = {}) {
   if (Vue.__vuemeta_installed) {
     return
   }
-
   Vue.__vuemeta_installed = true
 
   options = setOptions(options)
diff --git a/src/index.js b/src/index.js
index 6ee009a..16c4a2c 100644
--- a/src/index.js
+++ b/src/index.js
@@ -12,7 +12,6 @@ function install(Vue, options = {}) {
   if (Vue.__vuemeta_installed) {
     return
   }
-
   Vue.__vuemeta_installed = true
 
   options = setOptions(options)
diff --git a/test/unit/plugin-browser.test.js b/test/unit/plugin-browser.test.js
index 705b390..e5871bb 100644
--- a/test/unit/plugin-browser.test.js
+++ b/test/unit/plugin-browser.test.js
@@ -65,6 +65,18 @@ describe('plugin', () => {
     expect(VueMetaBrowserPlugin.version).toBe('test-version')
   })
 
+  test('plugin isnt be installed twice', () => {
+    expect(Vue.__vuemeta_installed).toBe(true)
+
+    Vue.prototype.$meta = undefined
+    Vue.use({ ...VueMetaBrowserPlugin })
+
+    expect(Vue.prototype.$meta).toBeUndefined()
+
+    // reset Vue
+    Vue = loadVueMetaPlugin(true)
+  })
+
   test('updates can be paused and resumed', async () => {
     const { batchUpdate: _batchUpdate } = jest.requireActual('../../src/client/update')
     const batchUpdateSpy = batchUpdate.mockImplementation(_batchUpdate)
diff --git a/test/unit/plugin-server.test.js b/test/unit/plugin-server.test.js
index d4a301b..9ff4d4f 100644
--- a/test/unit/plugin-server.test.js
+++ b/test/unit/plugin-server.test.js
@@ -63,6 +63,18 @@ describe('plugin', () => {
     expect(VueMetaServerPlugin.version).toBe('test-version')
   })
 
+  test('plugin isnt be installed twice', () => {
+    expect(Vue.__vuemeta_installed).toBe(true)
+
+    Vue.prototype.$meta = undefined
+    Vue.use({ ...VueMetaServerPlugin })
+
+    expect(Vue.prototype.$meta).toBeUndefined()
+
+    // reset Vue
+    Vue = loadVueMetaPlugin(true)
+  })
+
   test('prints deprecation warning once when using _hasMetaInfo', () => {
     const warn = jest.spyOn(console, 'warn').mockImplementation(() => {})