fix(no-alias-methods): handle missing assertion node

Fixes #213

Author: SimenB

rules/__tests__/no-alias-methods.test.js

@@ -18,6 +18,7 @@ ruleTester.run('no-alias-methods', rule, {
     'expect(a).toHaveLastReturnedWith()',
     'expect(a).toHaveNthReturnedWith()',
     'expect(a).toThrow()',
+    'expect(a).rejects;',
   ],
 
   invalid: [

rules/no-alias-methods.js

@@ -41,6 +41,10 @@ module.exports = {
           targetNode = method(node.parent);
         }
 
+        if (!targetNode) {
+          return;
+        }
+
         // Check if the method used matches any of ours
         const methodItem = methodNames.find(
           item => item[1] === targetNode.name