Fix tests

src/ClientBase.php

@@ -56,11 +56,12 @@ protected function async($method, array $arguments = []): PromiseInterface
      * @throws GuzzleException
      * @throws ApiException
      */
-    public function execute($method, array $arguments = ['format' => 'json']): object
+    public function execute($method, array $arguments = []): object
     {
         try {
+            $format = array_key_exists('format', $arguments) ? $arguments['format'] : 'json';
             $response = $this->guzzle->get($method, [
-                'headers' => $this->headers($arguments['format']),
+                'headers' => $this->headers($format),
                 'query'   => $arguments,
             ]);
         } catch (\GuzzleHttp\Exception\ClientException $e) {
@@ -70,7 +71,7 @@ public function execute($method, array $arguments = ['format' => 'json']): objec
             };
         }
 
-        switch ($arguments['format']) {
+        switch ($format) {
             case 'csv':
             case 'html':
                 $object_response = (object)array(

tests/Unit/IndicesTest.php

@@ -182,6 +182,28 @@ public function testCandles_fromTo_success()
         }
     }
 
+
+    /**
+     * @throws GuzzleException|ApiException
+     */
+    public function testCandles_csv_success()
+    {
+        $mocked_response = "s, c, h, l, o, t\r\n";
+        $this->setMockResponses([new Response(200, [], $mocked_response)]);
+
+        $response = $this->client->indices->candles(
+            symbol: "DJI",
+            from: '2022-09-01',
+            to: '2022-09-05',
+            resolution: 'D',
+            parameters: new Parameters(format: Format::CSV)
+        );
+
+        // Verify that the response is an object of the correct type.
+        $this->assertInstanceOf(Candles::class, $response);
+        $this->assertEquals($mocked_response, $response->getCsv());
+    }
+
     /**
      * @throws GuzzleException
      */
@@ -229,6 +251,8 @@ public function testCandles_noDataNextTimePrevTime_success()
         // Verify that the response is an object of the correct type.
         $this->assertInstanceOf(Candles::class, $response);
         $this->assertEmpty($response->candles);
+        $this->assertFalse($response->isCsv());
+        $this->assertFalse($response->isHtml());
         $this->assertEquals($mocked_response['s'], $response->status);
         $this->assertEquals(Carbon::parse($mocked_response['nextTime']), $response->next_time);
         $this->assertEquals(Carbon::parse($mocked_response['prevTime']), $response->next_time);