PYCBC-1644: Update GoCAVES download URL to use arm64

Motivation
==========
Recent updates to Jenkins have lead to macos arm tests failing with an
OSError.

Modification
============
Update test suite logic to download arm64 binary for macos platforms
when on an arm64 architecture.

Results
=======
All tests pass.

Change-Id: Ib0c8773ecb9c5df806037cfbb94d43519e53802b
Reviewed-on: https://review.couchbase.org/c/couchbase-python-client/+/221171
Tested-by: Build Bot <[email protected]>
Reviewed-by: Charles Dixon <[email protected]>

Author: thejcfactor

tests/environments/__init__.py

@@ -25,13 +25,11 @@ class CollectionType(IntEnum):
 class CouchbaseTestEnvironmentException(Exception):
     """Raised when something with the test environment is incorrect."""
 
-    def __init__(self, message=None, **kwargs):
-        if message and 'message' not in kwargs:
-            kwargs['message'] = message
-        super().__init__(**kwargs)
+    def __init__(self, message=None):
+        super().__init__(message)
 
     def __repr__(self):
-        return f"{type(self).__name__}({super().__repr__()})"
+        return f"{type(self).__name__}({super().__str__()})"
 
     def __str__(self):
         return self.__repr__()

tests/mock_server.py

@@ -292,7 +292,10 @@ def _build_caves_url(self, url):
             else:
                 self._caves_url = f"{url}/{self._caves_version}/gocaves-linux-amd64"
         elif sys.platform.startswith('darwin'):
-            self._caves_url = f"{url}/{self._caves_version}/gocaves-macos"
+            if platform.machine() == 'arm64':
+                self._caves_url = f"{url}/{self._caves_version}/gocaves-macos-arm64"
+            else:
+                self._caves_url = f"{url}/{self._caves_version}/gocaves-macos"
         elif sys.platform.startswith('win32'):
             self._caves_url = f"{url}/{self._caves_version}/gocaves-windows.exe"
         else:
@@ -303,7 +306,7 @@ def _validate_caves_path(self, caves_path=None):
             if sys.platform.startswith('linux'):
                 caves_path = 'gocaves-linux-arm64' if platform.machine() == 'aarch64' else 'gocaves-linux-amd64'
             elif sys.platform.startswith('darwin'):
-                caves_path = 'gocaves-macos'
+                caves_path = 'gocaves-macos-arm64' if platform.machine() == 'arm64' else 'gocaves-macos'
             elif sys.platform.startswith('win32'):
                 caves_path = 'gocaves-windows.exe'