azure: support prefix

Fixes #1336

Signed-off-by: Ruslan Kuprieiev <[email protected]>

tests/test_data_cloud.py

@@ -141,10 +141,16 @@ def get_gcp_url():
     return 'gs://' + get_gcp_storagepath()
 
 
-def get_azure_url():
+def get_azure_url_compat():
     return 'azure://'
 
 
+def get_azure_url():
+    container_name = os.getenv("AZURE_STORAGE_CONTAINER_NAME")
+    assert container_name is not None
+    return 'azure://{}/{}'.format(container_name, str(uuid.uuid4()))
+
+
 def sleep():
     # Sleep some time to simulate realistic behavior.
     # Some filesystems have a bad date resolution for
@@ -312,17 +318,22 @@ class TestRemoteGS(TestDataCloudBase):
         return RemoteGS
 
 
-class TestRemoteAzure(TestDataCloudBase):
+class TestRemoteAzureCompat(TestDataCloudBase):
     def _should_test(self):
         return _should_test_azure()
 
     def _get_url(self):
-        return get_azure_url()
+        return get_azure_url_compat()
 
     def _get_cloud_class(self):
         return RemoteAzure
 
 
+class TestRemoteAzure(TestRemoteAzureCompat):
+    def _get_url(self):
+        return get_azure_url()
+
+
 class TestRemoteLOCAL(TestDataCloudBase):
     def _should_test(self):
         return True