Add API docs for isDisabled() assertion

API.md

@@ -15,6 +15,7 @@
  - [isVisible](#isvisible)
  - [isNotVisible](#isnotvisible)
  - [hasAttribute](#hasattribute)
+ - [isDisabled](#isdisabled)
  - [isNotDisabled](#isnotdisabled)
  - [doesNotHaveAttribute](#doesnothaveattribute)
  - [hasClass](#hasclass)
@@ -254,8 +255,27 @@ or regular expression.
 assert.dom('input.password-input').hasAttribute('type', 'password');
 ```
 
+### isDisabled
+
+- **See: [#isNotDisabled](#isNotDisabled)**
+
+Assert that the [HTMLElement][] or an [HTMLElement][] matching the
+`selector` is disabled.
+
+**Parameters**
+
+- `message` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** 
+
+**Examples**
+
+```javascript
+assert.dom('.foo').isDisabled();
+```
+
 ### isNotDisabled
 
+- **See: [#isDisabled](#isDisabled)**
+
 Assert that the [HTMLElement][] or an [HTMLElement][] matching the
 `selector` is not disabled.
 

documentation.yml

@@ -29,6 +29,7 @@ toc:
  - isVisible
  - isNotVisible
  - hasAttribute
+ - isDisabled
  - isNotDisabled
  - doesNotHaveAttribute
  - hasClass

lib/assertions.js

@@ -259,6 +259,18 @@ export default class DOMAssertions {
  }
  }
 
+ /**
+ * Assert that the [HTMLElement][] or an [HTMLElement][] matching the
+ * `selector` is disabled.
+ *
+ * @name isDisabled
+ * @param {string?} message
+ *
+ * @example
+ * assert.dom('.foo').isDisabled();
+ *
+ * @see {@link #isNotDisabled}
+ */
  isDisabled(message) {
  let element = this.findTargetElement();
 
@@ -290,6 +302,7 @@ export default class DOMAssertions {
  * @example
  * assert.dom('.foo').isNotDisabled();
  *
+ * @see {@link #isDisabled}
  */
  isNotDisabled(message) {
  isNotDisabled.call(this, message);