From 80023809a4597185eed6970058aae1076b4115ff Mon Sep 17 00:00:00 2001
From: Paul Campbell <pcampbell@kemitix.net>
Date: Sun, 31 Dec 2017 19:21:58 +0000
Subject: [PATCH] Add test for normal Mon.factory() behaviour

---
 src/test/java/net/kemitix/mon/MonTest.java | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/test/java/net/kemitix/mon/MonTest.java b/src/test/java/net/kemitix/mon/MonTest.java
index 3d8a660..7e5f8e2 100644
--- a/src/test/java/net/kemitix/mon/MonTest.java
+++ b/src/test/java/net/kemitix/mon/MonTest.java
@@ -113,6 +113,20 @@ public class MonTest {
                 .withMessage("onInvalid");
     }
 
+    @Test
+    public void factory() {
+        //given
+        final Function<Integer, Optional<?>> evenMonFactory =
+                Mon.factory((Integer v) -> v % 2 == 0, Optional::of, Optional::empty);
+        //when
+        final Optional<?> oddResult = evenMonFactory.apply(1);
+        final Optional<?> evenResult = evenMonFactory.apply(2);
+        //then
+        assertThat(oddResult).isEmpty();// because 1 % 2 != 0
+        assertThat(evenResult).isNotEmpty(); // because 2 % 2 == 0
+        evenResult.ifPresent(value -> assertThat(value).isEqualTo(Mon.of(2)));
+    }
+
     @Test
     public void shouldGetInvalidResultWhenFactoryApplyWithNull() {
         //given