LPD-65239 portal-search: add test

https://liferay.atlassian.net/browse/LPD-65239

Author: joshuacords

modules/apps/portal-search/portal-search/src/test/java/com/liferay/portal/search/internal/permission/DefaultSearchResultPermissionFilterTest.java

@@ -23,17 +23,15 @@
 import com.liferay.portal.search.searcher.SearchRequest;
 import com.liferay.portal.search.searcher.SearchRequestBuilder;
 import com.liferay.portal.test.rule.LiferayUnitTestRule;
-
-import java.util.Arrays;
-import java.util.function.Function;
-
 import org.junit.Assert;
 import org.junit.ClassRule;
 import org.junit.Rule;
 import org.junit.Test;
-
 import org.mockito.Mockito;
 
+import java.util.Arrays;
+import java.util.function.Function;
+
 /**
  * @author Gustavo Lima
  */
@@ -119,6 +117,16 @@ public void testSearchGuestWithThreshold() {
 			searchContext, defaultSearchResultPermissionFilter, 9, 9);
 	}
 
+	@Test
+	public void testSearchWithSizeZero() {
+		_groupAdmin = false;
+		_permissionFilteredSearchResultAccurateCountThreshold = 0;
+
+		_assertPagination(
+			_getSearchContext(0), _getDefaultSearchResultPermissionFilter(), 0,
+			_PRIVATE_DOCUMENTS + _PUBLIC_DOCUMENTS);
+	}
+
 	private void _assertPagination(
 		SearchContext searchContext,
 		DefaultSearchResultPermissionFilter defaultSearchResultPermissionFilter,