diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 000000000..8c29546c7
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,9 @@
+parameters:
+    ignoreErrors:
+        - '#Mockery\\MockInterface::shouldReceive\(\)#'
+        - '#Mockery\\MockInterface given#'
+        - '#Mockery\\MockInterface\[\] given#'
+
+        # because of \Elasticsearch\Tests\RegisteredNamespaceTest
+        - '#Call to an undefined method Elasticsearch\\Client::foo\(\)#'
+        - '#Call to an undefined method Elasticsearch\\Client::bar\(\)#'
diff --git a/tests/Elasticsearch/Tests/ConnectionPool/StaticConnectionPoolTest.php b/tests/Elasticsearch/Tests/ConnectionPool/StaticConnectionPoolTest.php
index 25223c95c..a87768869 100644
--- a/tests/Elasticsearch/Tests/ConnectionPool/StaticConnectionPoolTest.php
+++ b/tests/Elasticsearch/Tests/ConnectionPool/StaticConnectionPoolTest.php
@@ -126,6 +126,9 @@ public function testAllHostsFailPing()
         $this->expectException(\Elasticsearch\Common\Exceptions\NoNodesAvailableException::class);
         $this->expectExceptionMessage('No alive nodes found in your cluster');
 
+        $this->expectException(\Elasticsearch\Common\Exceptions\NoNodesAvailableException::class);
+        $this->expectExceptionMessage('No alive nodes found in your cluster');
+
         $connectionPool->nextConnection();
     }
 
diff --git a/tests/Elasticsearch/Tests/YamlRunnerTest.php b/tests/Elasticsearch/Tests/YamlRunnerTest.php
index 9348059d2..be8bf2fb4 100644
--- a/tests/Elasticsearch/Tests/YamlRunnerTest.php
+++ b/tests/Elasticsearch/Tests/YamlRunnerTest.php
@@ -169,7 +169,7 @@ public function testAsyncIntegration($testProcedure, $skip, $setupProcedure, $fi
         }
 
         if (null !== $setupProcedure) {
-            $this->processProcedure(current($setupProcedure), 'setup');
+            $this->processProcedure(current($setupProcedure), 'setup', $fileName);
             $this->waitForYellow();
         }
 
@@ -326,6 +326,9 @@ public function operationDo($operation, $lastOperationResult, &$context, $testNa
             $endpointParams->client['headers'] = $headers;
         }
 
+        if (!is_string($method)) {
+            throw new \Exception('$method must be string');
+        }
         list($method, $namespace) = $this->mapEndpoint($method, $namespace);
 
         if (null !== $namespace) {
@@ -404,7 +407,7 @@ public function executeRequest($caller, $method, $endpointParams, $expectedError
      *
      * @throws \Exception
      *
-     * @return bool
+     * @return bool|mixed[]
      */
     public function executeAsyncExistRequest($caller, $method, $endpointParams, $expectedError, $expectedWarnings, $testName)
     {