Test empty TreeMap hashCode

mperry · mperry · commit 67e69b3dcc6f · 2015-09-04T08:13:48.000+10:00
diff --git a/core/src/test/java/fj/data/TreeMapTest.java b/core/src/test/java/fj/data/TreeMapTest.java
@@ -122,4 +122,11 @@ public void minKey() {
         assertThat(t2.delete(0).minKey(), equalTo(some(1)));
     }
 
+    public void emptyHashCode() {
+        // Hash code of tree map should not throw NullPointerException
+        // see https://github.com/functionaljava/functionaljava/issues/187
+        int i = TreeMap.empty(Ord.stringOrd).hashCode();
+        assertTrue(true);
+    }
+
 }

Original file line number	Diff line number	Diff line change
`@@ -122,4 +122,11 @@ public void minKey() {`
`122`	`122`	`assertThat(t2.delete(0).minKey(), equalTo(some(1)));`
`123`	`123`	`}`
`124`	`124`
	`125`	`+ public void emptyHashCode() {`
	`126`	`+ // Hash code of tree map should not throw NullPointerException`
	`127`	`+ // see https://github.com/functionaljava/functionaljava/issues/187`
	`128`	`+ int i = TreeMap.empty(Ord.stringOrd).hashCode();`
	`129`	`+ assertTrue(true);`
	`130`	`+ }`
	`131`	`+`
`125`	`132`	`}`