add test for parsing state from pbf

update/state/state_test.go

@@ -0,0 +1,20 @@
+package state
+
+import (
+	"testing"
+	"time"
+)
+
+func TestFromPBF(t *testing.T) {
+	state, err := FromPbf("../../parser/pbf/monaco-20150428.osm.pbf", time.Hour*1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	expected, err := time.Parse(time.RFC3339, "2015-04-27T22:21:02+02:00")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if state.Sequence != 1368231 || !state.Time.Equal(expected) {
+		t.Error(state)
+	}
+}