Adding unit tests for Order ID sorting

types/orders_test.go

@@ -0,0 +1,29 @@
+package types
+
+import (
+	"reflect"
+	"sort"
+	"testing"
+)
+
+func TestSortOrderIDs(t *testing.T) {
+	var tests = []struct {
+		unsorted OrderIDs
+		want     OrderIDs
+	}{
+		{
+			unsorted: OrderIDs{"id-a", "id-b", "id-c"},
+			want:     OrderIDs{"id-a", "id-b", "id-c"},
+		},
+		{
+			unsorted: OrderIDs{"id-c", "id-b", "id-a"},
+			want:     OrderIDs{"id-a", "id-b", "id-c"},
+		},
+	}
+	for _, tt := range tests {
+		sort.Sort(tt.unsorted)
+		if !reflect.DeepEqual(tt.unsorted, tt.want) {
+			t.Errorf("sorting order IDs failed, got: %v, want: %v", tt.unsorted, tt.want)
+		}
+	}
+}