fix(toCotainKeys): should not throw when actual is undefied

src/matchers/toContainKeys/predicate.js

@@ -1 +1,2 @@
-export default (obj, keys) => keys.every(key => obj.hasOwnProperty && Object.prototype.hasOwnProperty.call(obj, key));
+export default (obj, keys) =>
+  keys.every(key => obj && obj.hasOwnProperty && Object.prototype.hasOwnProperty.call(obj, key));

src/matchers/toContainKeys/predicate.test.js

@@ -10,4 +10,10 @@ describe('.toContainKeys', () => {
   test('fails when object does not contain all keys', () => {
     expect(predicate(data, ['d'])).toBe(false);
   });
+
+  test('does not throw when object is undefined', () => {
+    expect(() => {
+      predicate(undefined, ['d']);
+    }).not.toThrow();
+  });
 });