Update to gobook@c6d7a22edd03e7738c38d5baa2174ff325d8d863

ch4/treesort/sort_test.go

@@ -0,0 +1,23 @@
+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+package treesort_test
+
+import (
+	"math/rand"
+	"sort"
+	"testing"
+
+	"gopl.io/ch4/treesort"
+)
+
+func TestSort(t *testing.T) {
+	data := make([]int, 50)
+	for i := range data {
+		data[i] = rand.Int() % 50
+	}
+	treesort.Sort(data)
+	if !sort.IntsAreSorted(data) {
+		t.Errorf("not sorted: %s", data)
+	}
+}