chore: first wave of unit tests

Author: jackwotherspoon

tests/unit/test_resolver.py

@@ -0,0 +1,34 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from google.cloud.sql.connector.connection_name import ConnectionName
+from google.cloud.sql.connector.resolver import DefaultResolver
+from google.cloud.sql.connector.resolver import DnsResolver
+
+conn_str = "test-project:test-region:test-instance"
+conn_name = ConnectionName("test-project", "test-region", "test-instance")
+
+
+async def test_DefaultResolver() -> None:
+    """Test DefaultResolver just parses instance connection string."""
+    resolver = DefaultResolver()
+    result = await resolver.resolve(conn_str)
+    assert result == conn_name
+
+
+async def test_DnsResolver_with_conn_str() -> None:
+    """Test DnsResolver with instance connection name just parses connection string."""
+    resolver = DnsResolver()
+    result = await resolver.resolve(conn_str)
+    assert result == conn_name