chore: update deprecation messages (vuejs#1534)

Author: lmiller1990

packages/shared/util.js

@@ -102,7 +102,7 @@ export function nextTick(): Promise<void> {
 
 export function warnDeprecated(method: string, fallback: string = '') {
   if (!config.showDeprecationWarnings) return
-  let msg = `${method} is deprecated and will be removed in the next major version`
-  if (fallback) msg += ` ${fallback}`
+  let msg = `${method} is deprecated and will be removed in the next major version.`
+  if (fallback) msg += ` ${fallback}.`
   warn(msg)
 }

packages/test-utils/src/wrapper.js

@@ -342,7 +342,8 @@ export default class Wrapper implements BaseWrapper {
   isEmpty(): boolean {
     warnDeprecated(
       'isEmpty',
-      'Consider a custom matcher such as those provided in jest-dom: https://github.com/testing-library/jest-dom#tobeempty'
+      'Consider a custom matcher such as those provided in jest-dom: https://github.com/testing-library/jest-dom#tobeempty. ' +
+        'When using with findComponent, access the DOM element with findComponent(Comp).element'
     )
     if (!this.vnode) {
       return this.element.innerHTML === ''
@@ -371,7 +372,8 @@ export default class Wrapper implements BaseWrapper {
   isVisible(): boolean {
     warnDeprecated(
       'isVisible',
-      `Consider a custom matcher such as those provided in jest-dom: https://github.com/testing-library/jest-dom#tobevisible`
+      'Consider a custom matcher such as those provided in jest-dom: https://github.com/testing-library/jest-dom#tobevisible. ' +
+        'When using with findComponent, access the DOM element with findComponent(Comp).element'
     )
     let element = this.element
     while (element) {