Fix sort-comp ClassExpression

Fixes #1076. Also adds test.

Author: Roy Sutton

lib/rules/sort-comp.js

@@ -291,6 +291,7 @@ module.exports = {
      */
     function getComponentProperties(node) {
       switch (node.type) {
+        case 'ClassExpression':
         case 'ClassDeclaration':
           return node.body.body;
         case 'ObjectExpression':

tests/lib/rules/sort-comp.js

@@ -286,6 +286,20 @@ ruleTester.run('sort-comp', rule, {
     ].join('\n'),
     parserOptions: parserOptions,
     errors: [{message: 'render should be placed after onClick'}]
+  }, {
+    // Must force a custom method to be placed before render, even in function
+    code: [
+      'var Hello = () => {',
+      '  return class Test extends React.Component {',
+      '    render () {',
+      '      return <div>Hello</div>;',
+      '    }',
+      '    onClick () {}',
+      '  }',
+      '};'
+    ].join('\n'),
+    parserOptions: parserOptions,
+    errors: [{message: 'render should be placed after onClick'}]
   }, {
     // Must force a custom method to be placed after render if no 'everything-else' group is specified
     code: [