[ElasticaAdapter] use count() instead search() for getNbResult()

src/Pagerfanta/Adapter/ElasticaAdapter.php

@@ -60,7 +60,7 @@ public function __construct(SearchableInterface $searchable, Query $query, array
     public function getNbResults()
     {
         if (!$this->resultSet) {
-            $totalHits = $this->searchable->search($this->query, $this->options)->getTotalHits();
+            $totalHits = $this->searchable->count($this->query);
         } else {
             $totalHits = $this->resultSet->getTotalHits();
         }

tests/Pagerfanta/Tests/Adapter/ElasticaAdapterTest.php

@@ -2,8 +2,6 @@
 
 namespace Pagerfanta\Tests\Adapter;
 
-use Elastica\Response;
-use Elastica\ResultSet;
 use Pagerfanta\Adapter\ElasticaAdapter;
 use PHPUnit\Framework\TestCase;
 
@@ -56,32 +54,48 @@ public function testGetSlice()
         $this->assertSame($this->resultSet, $this->adapter->getResultSet());
     }
 
-    public function testGetNbResults()
+    /**
+     * Returns the number of results before search, use count() method if resultSet is empty
+     */
+    public function testGetNbResultsBeforeSearch()
     {
-        $this->searchable->expects($this->any())
+        $this->searchable->expects($this->once())
+            ->method('count')
+            ->with($this->query)
+            ->willReturn(100);
+
+        $this->assertSame(100, $this->adapter->getNbResults());
+    }
+
+    /**
+     * Returns the number of results after search, use getTotalHits() method if resultSet is not empty
+     */
+    public function testGetNbResultsAfterSearch()
+    {
+        $adapter = new ElasticaAdapter($this->searchable, $this->query, [], 30);
+
+        $this->searchable->expects($this->once())
             ->method('search')
-            ->with($this->query, $this->options)
+            ->with($this->query, array('from' => 10, 'size' => 30))
             ->will($this->returnValue($this->resultSet));
 
         $this->resultSet->expects($this->once())
             ->method('getTotalHits')
             ->will($this->returnValue(100));
 
-        $this->assertSame(100, $this->adapter->getNbResults());
+        $adapter->getSlice(10, 30);
+
+        $this->assertSame(30, $adapter->getNbResults());
     }
 
     public function testGetNbResultsWithMaxResultsSet()
     {
         $adapter = new ElasticaAdapter($this->searchable, $this->query, [], 10);
 
-        $this->searchable->expects($this->any())
-            ->method('search')
-            ->with($this->query, [])
-            ->will($this->returnValue($this->resultSet));
-
-        $this->resultSet->expects($this->once())
-            ->method('getTotalHits')
-            ->will($this->returnValue(100));
+        $this->searchable->expects($this->once())
+            ->method('count')
+            ->with($this->query)
+            ->willReturn(100);
 
         $this->assertSame(10, $adapter->getNbResults());
     }