test(maximum): add maximum test

Author: djcsdy

index.test.ts

@@ -21,6 +21,7 @@ import {
     isArrayLike,
     last,
     map,
+    maximum,
     partition,
     partitionWhile,
     remove,
@@ -205,6 +206,12 @@ test("find", t => {
     );
 });
 
+test("maximum", t => {
+    t.is(maximum([1, 2, 3]), 3);
+    t.is(maximum([1, 2, 3, 4, 3, 2, 1]), 4);
+    t.is(maximum([]), null);
+});
+
 type Result<T> = Success<T> | Error;
 
 interface Success<T> {