Add unit tests for `providers/api.py` module

Signed-off-by: Mihaela Balutoiu <mbalutoiu@cloudbasesolutions.com>

coriolis/tests/providers/test_api.py

@@ -0,0 +1,35 @@
+# Copyright 2024 Cloudbase Solutions Srl
+# All Rights Reserved.
+
+from unittest import mock
+
+from coriolis.providers import api as providers_module
+from coriolis.tests import test_base
+
+
+class APITestCase(test_base.CoriolisBaseTestCase):
+    """Test suite for the Coriolis API class."""
+
+    def setUp(self):
+        super(APITestCase, self).setUp()
+        self.api = providers_module.API()
+        self.rpc_client = mock.MagicMock()
+        self.ctxt = mock.sentinel.ctxt
+        self.api._rpc_client = self.rpc_client
+
+    def test_get_available_providers(self):
+        result = self.api.get_available_providers(self.ctxt)
+
+        self.rpc_client.get_available_providers.assert_called_once_with(
+            self.ctxt)
+        self.assertEqual(result,
+                         self.rpc_client.get_available_providers.return_value)
+
+    def test_get_provider_schemas(self):
+        result = self.api.get_provider_schemas(
+            self.ctxt, mock.sentinel.platform_name, '1')
+
+        self.rpc_client.get_provider_schemas.assert_called_once_with(
+            self.ctxt, mock.sentinel.platform_name, 1)
+        self.assertEqual(
+            result, self.rpc_client.get_provider_schemas.return_value)