Change to test for explicit number of calls

Author: thomasm-ttd

src/test/java/com/uid2/shared/attest/UidOptOutClientTest.java

@@ -78,7 +78,7 @@ void usesOptOutUrlForDownloadWithPath(String path, String expectedFullPath) thro
         when(mockAttestationResponseHandler.getOptOutUrl()).thenReturn("https://core.example.com");
 
         InputStream is = this.optOutClient.download(path);
-        verify(mockAttestationResponseHandler, atLeastOnce()).getOptOutUrl();
+        verify(mockAttestationResponseHandler, times(2)).getOptOutUrl();
         verify(mockHttpClient).get(eq(expectedFullPath), any());
     }