docs: fix docs/en/api/config.md (#195)

Author: 38elements

docs/en/api/config.md

@@ -14,7 +14,7 @@ vue-test-utils includes a config object to defined options used by vue-test-util
 
 Stubs to use in components. These are overwritten by `stubs` passed in the mounting options.
 
-When passing `stubs` as an array in the mounting options, `config.stubs` are converted to an array, and will stub components with a basic component that returns a div.
+When passing `stubs` as an array in the mounting options, `config.stubs` are converted to an array, and will stub components with a basic component that returns `<!---->`.
 
 Example:
 

docs/en/api/options.md

@@ -61,7 +61,7 @@ expect(wrapper.find('div')).toBe(true)
 
 - type: `{ [name: string]: Component | boolean } | Array<string>`
 
-Stubs child components. Can be an Array of component names to stub, or an object.
+Stubs child components. Can be an Array of component names to stub, or an object. If `stubs` is an Array, every stub is `<!---->`.
 
 Example:
 

test/unit/specs/mount/options/stubs.spec.js

@@ -212,6 +212,7 @@ describe('mount.stub', () => {
     })
     expect(wrapper.contains('time')).to.equal(false)
     expect(wrapper.contains('p')).to.equal(false)
+    expect(wrapper.html()).to.equal('<div><!----></div>')
   })
 
   it('throws an error when passed an invalid value as stub', () => {