_Integrity&quot; self test is always run at startup. The &quot;Install_Integrity&quot; self test is used to check if the self tests have already been run at installation time. If they have already run then the self tests are not run on subsequent startups. All other self test categories are run once at installation time, except for the &quot;Pairwise_Consistency_Test&quot;.</p>

<p>There is only one instance of the &quot;Module_Integrity&quot; and &quot;Install_Integrity&quot; self tests. All other self tes