From bc71a8c16524d61ef6ddaad9412c7158b45064b1 Mon Sep 17 00:00:00 2001
From: Christopher Tessum <ctessum@gmail.com>
Date: Sun, 22 Jul 2018 22:17:54 +0000
Subject: [PATCH] Add multipolygon test

---
 multipolygon_test.go | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 multipolygon_test.go

diff --git a/multipolygon_test.go b/multipolygon_test.go
new file mode 100644
index 0000000..cc6714b
--- /dev/null
+++ b/multipolygon_test.go
@@ -0,0 +1,36 @@
+package geom
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestMultipolygon_Difference(t *testing.T) {
+	mp1 := MultiPolygon{Polygon{
+		Path{
+			Point{X: 99, Y: 164}, Point{X: 99, Y: 108}, Point{X: 114, Y: 108}, Point{X: 114, Y: 0},
+			Point{X: 121, Y: 0}, Point{X: 121, Y: 164}, Point{X: 99, Y: 164},
+		},
+		Path{
+			Point{X: 0, Y: 499}, Point{X: 0, Y: 488},
+			Point{X: 88, Y: 488}, Point{X: 88, Y: 465}, Point{X: 97, Y: 465},
+			Point{X: 97, Y: 326}, Point{X: 79, Y: 326}, Point{X: 79, Y: 258},
+			Point{X: 121, Y: 258}, Point{X: 121, Y: 499}, Point{X: 0, Y: 499},
+		},
+	}}
+
+	mp2 := MultiPolygon{Polygon{Path{
+		Point{X: 114, Y: 0}, Point{X: 161, Y: 0}, Point{X: 161, Y: 168},
+		Point{X: 114, Y: 168}, Point{X: 114, Y: 0},
+	}}}
+
+	difference := mp2.Difference(mp1)
+	want := Polygon{Path{
+		Point{X: 114, Y: 168}, Point{X: 114, Y: 164}, Point{X: 121, Y: 164},
+		Point{X: 121, Y: 0}, Point{X: 161, Y: 0}, Point{X: 161, Y: 168},
+		Point{X: 114, Y: 168},
+	}}
+	if !reflect.DeepEqual(want, difference) {
+		t.Errorf("want %+v, have %+v", want, difference)
+	}
+}