If you sign into DoubleClick for Publishers and generate a click or impression from the same IP address, the click or impression will be disregarded. DFP filters out invalid activity to protect publishers and advertisers from fraudulent or otherwise invalid impressions. For more details on our IAB compliance and invalid actvitiy filtering process, please go to Filtration Methodology.
Impressions generated by previewing or testing a creative aren't included in reports. The 'Impressions' or 'Clicks' field on the summary page of the line items you've previewed or tested displays the label 'Test impressions received'. This indicates that the ad server received at least one impression it hasn't counted because the traffic source was not a visitor to your web site. This label also displays in the 'Impressions' or 'Clicks' field of orders that contain previewed or tested line items.