Add flow test for immutable-js#1389 (immutable-js#1390)

leebyron · web-flow · commit 275486e5be96 · 2017-10-16T12:45:33.000-07:00
diff --git a/type-definitions/tests/immutable-flow.js b/type-definitions/tests/immutable-flow.js
@@ -366,6 +366,10 @@ stringToNumberOrString = Map({'a': 1}).mergeDeepWith((previous, next, key) => 1,
 // $ExpectError - the array [1] is not a valid argument
 stringToNumber = Map({'a': 1}).mergeDeepWith((previous, next, key) => 1, [1])
 
+// KeyedSeq can merge into Map
+var stringToStringSeq: KeyedSeq<string, string> = Seq({'b': 'B'});
+stringToNumberOrString = Map({'a': 1}).merge(stringToStringSeq);
+
 // $ExpectError
 stringToNumber = Map({'a': 1}).setIn([], 0)
 // $ExpectError
