func testForEachMessage(mbox store.Folder, lowID, highID, suffix,
expectedCount uint64, t *testing.T) {
counter := uint64(0)
err := mbox.ForEachMessage(lowID, highID, suffix,
func(index, suffix uint64, msg []byte) error {
counter++
return nil
})
if err != nil {
t.Errorf("For lowID %d, highID %d, suffix %d, got error %v", lowID,
highID, suffix, err)
}
if expectedCount != counter {
t.Errorf("For lowID %d, highID %d, suffix %d, expected counter %d got %d",
lowID, highID, suffix, expectedCount, counter)
}
}
