Merge branch 'development' into docs/readme-badges

1 files changed, 86 insertions, 2 deletions

diff --git a/tests/test_extract_lambda.py b/tests/test_extract_lambda.py
index 877e36a..fc68a4a 100644
--- a/tests/test_extract_lambda.py
+++ b/tests/test_extract_lambda.py
@@ -3,14 +3,16 @@ import boto3
 from moto import mock_aws
 from unittest.mock import patch, MagicMock
 from unittest import TestCase
+import os
+import logging
+import json
 from src.extract_lambda import (
     list_existing_s3_files,
     connect_to_database,
     DBConnectionException,
+    lambda_handler,
     process_and_upload_tables,
 )
-import os
-import logging
 
 
 @pytest.fixture(scope="class")
@@ -40,6 +42,88 @@ def s3_client(aws_credentials):
     with mock_aws():
         yield boto3.client("s3")
 
+class TestLambdaHandler:
+    def test_lambda_handler_files_processed_and_uploaded_successfully(self, mocker):
+        mock_db = MagicMock()
+        mock_db.run.side_effect = [
+            [["Fruits"]],
+            [["Vegetable", "Sour", "Green"], ["Berry", "Sweet", "Red"]],
+            [["Food_type"], ["Flavour"], ["Colour"]],
+        ]
+        mock_db.columns.return_value = [
+            {"name": "Food_type"},
+            {"name": "Flavour"},
+            {"name": "Colour"},
+        ]
+        with patch("src.extract_lambda.connect_to_database", return_value=mock_db):
+            mock_process_and_upload_tables = mocker.patch(
+                "src.extract_lambda.process_and_upload_tables", return_value=mock_db
+            )
+            mock_list_existing_s3_files = mocker.patch(
+                "src.extract_lambda.list_existing_s3_files", return_value={}
+            )
+            event = {}
+            context = {}
+            response = lambda_handler(event, context)
+            assert response["statusCode"] == 200
+            assert (
+                json.loads(response["body"])
+                == "CSV files processed and uploaded successfully."
+            )
+            mock_list_existing_s3_files.assert_called_once()
+            mock_process_and_upload_tables.assert_called_once_with(mock_db, {})
+            mock_db.close.assert_called_once()
+
+    def test_lambda_handler_no_changes_detected_no_files_uploaded(self, mocker):
+        mock_db = MagicMock()
+        mock_db.run.side_effect = [
+            [["Fruits"]],
+            [["Vegetable", "Sour", "Green"], ["Berry", "Sweet", "Red"]],
+            [["Food_type"], ["Flavour"], ["Colour"]],
+        ]
+        mock_db.columns.return_value = [
+            {"name": "Food_type"},
+            {"name": "Flavour"},
+            {"name": "Colour"},
+        ]
+
+        with patch("src.extract_lambda.connect_to_database", return_value=mock_db):
+            mock_process_and_upload_tables = mocker.patch(
+                "src.extract_lambda.process_and_upload_tables", return_value=False
+            )
+            mock_list_existing_s3_files = mocker.patch(
+                "src.extract_lambda.list_existing_s3_files", return_value={}
+            )
+            event = {}
+            context = {}
+            response = lambda_handler(event, context)
+            assert response["statusCode"] == 200
+            assert (
+                json.loads(response["body"])
+                == "No changes detected, no CSV files were uploaded."
+            )
+            mock_list_existing_s3_files.assert_called_once()
+            mock_process_and_upload_tables.assert_called_once_with(mock_db, {})
+            mock_db.close.assert_called_once()
+
+    def test_lambda_handler_exception_error(self, mocker):
+        with patch(
+            "src.extract_lambda.connect_to_database",
+            side_effect=Exception("Database connection error"),
+        ):
+            mock_process_and_upload_tables = mocker.patch(
+                "src.extract_lambda.process_and_upload_tables"
+            )
+            mock_list_existing_s3_files = mocker.patch(
+                "src.extract_lambda.list_existing_s3_files"
+            )
+            event = {}
+            context = {}
+            response = lambda_handler(event, context)
+            assert response["statusCode"] == 500
+            assert json.loads(response["body"]) == "Internal server error."
+            mock_list_existing_s3_files.assert_not_called()
+            mock_process_and_upload_tables.assert_not_called()
 
 class TestListExistingS3Files:
     def test_error_if_no_bucket(self, s3_client, caplog):