fix(to-have-style): fix bug in to-have-style (#98)

* fix(to-have-style): fix bug in to-have-style

* fix lint error

Author: benmonro

src/__tests__/lib/rules/prefer-to-have-style.js

@@ -18,6 +18,10 @@ ruleTester.run("prefer-to-have-style", rule, {
     }, [foo]);`,
   ],
   invalid: [
+    {
+      code: `expect(a.style).toHaveProperty('transform')`,
+      errors
+    },
     {
       code: `expect(el.style.foo).toBe("bar")`,
       errors,

src/rules/prefer-to-have-style.js

@@ -193,6 +193,9 @@ export const create = (context) => ({
       node: node.property,
       message: "Use toHaveStyle instead of asserting on element style",
       fix(fixer) {
+        if (!styleValue) {
+          return null;
+        }
         return [
           fixer.removeRange([node.object.range[1], node.property.range[1]]),
           fixer.replaceText(matcher, "toHaveStyle"),