docs: setValue, setChecked, setSelected (#694)

Author: lmiller1990

docs/api/wrapper/README.md

@@ -42,8 +42,11 @@ A `Wrapper` is an object that contains a mounted component or vnode and methods
 !!!include(docs/api/wrapper/isVueInstance.md)!!!
 !!!include(docs/api/wrapper/name.md)!!!
 !!!include(docs/api/wrapper/props.md)!!!
+!!!include(docs/api/wrapper/setChecked.md)!!!
 !!!include(docs/api/wrapper/setData.md)!!!
 !!!include(docs/api/wrapper/setMethods.md)!!!
 !!!include(docs/api/wrapper/setProps.md)!!!
+!!!include(docs/api/wrapper/setSelected.md)!!!
+!!!include(docs/api/wrapper/setValue.md)!!!
 !!!include(docs/api/wrapper/text.md)!!!
 !!!include(docs/api/wrapper/trigger.md)!!!

docs/api/wrapper/setChecked.md

@@ -0,0 +1,18 @@
+## setChecked(value)
+
+Sets the value of a radio or checkbox `<input`>.
+
+- **Arguments:**
+  - `{Boolean} selected`
+
+- **Example:**
+
+```js
+import { mount } from '@vue/test-utils'
+import Foo from './Foo.vue'
+
+const wrapper = mount(Foo)
+const option = wrapper.find('input[type="radio"]')
+option.setChecked()
+```
+

docs/api/wrapper/setSelected.md

@@ -0,0 +1,19 @@
+## setSelected(value)
+
+Sets a specified `<option>` as selected in a `<select>`.
+
+- **Arguments:**
+  - `{Boolean} selected`
+
+- **Example:**
+
+```js
+import { mount } from '@vue/test-utils'
+import Foo from './Foo.vue'
+
+const wrapper = shallowMount(Foo)
+const options = wrapper.find('select').findAll('option')
+
+options.at(1).setSelected()
+expect(wrapper.text()).to.contain('option1')
+```

docs/api/wrapper/setValue.md

@@ -0,0 +1,17 @@
+## setValue(value)
+
+Sets the value of a text `<input>`.
+
+- **Arguments:**
+  - `{String} value`
+
+- **Example:**
+
+```js
+import { mount } from '@vue/test-utils'
+import Foo from './Foo.vue'
+
+const wrapper = mount(Foo)
+const input = wrapper.find('input[type="text"]')
+input.setValue('some value')
+```