fix url

test/test_core.py

@@ -14,7 +14,6 @@
 # a commercial license, send an email to license@arduino.cc.
 import os
 import platform
-
 import pytest
 import simplejson as json
 
@@ -107,11 +106,12 @@ def test_core_updateindex_invalid_url(run_command):
 
 
 @pytest.mark.skipif(
-    platform.system() in ("Windows", "Darwin"), reason="core fails to install properly",
+    platform.system() == "Windows",
+    reason="core fails with fatal error: bits/c++config.h: No such file or directory",
 )
 def test_core_install_esp32(run_command, data_dir):
     # update index
-    url = "https://arduino.esp8266.com/stable/package_esp8266com_index.json"
+    url = "https://dl.espressif.com/dl/package_esp32_index.json"
     assert run_command("core update-index --additional-urls={}".format(url))
     # install 3rd-party core
     assert run_command("core install esp32:esp32 --additional-urls={}".format(url))