feat/passing tests to helper function list_existing_s3_files

1 files changed, 49 insertions, 0 deletions

diff --git a/tests/test_extract_lambda.py b/tests/test_extract_lambda.py
new file mode 100644
index 0000000..472e93a
--- /dev/null
+++ b/tests/test_extract_lambda.py
@@ -0,0 +1,49 @@
+import pytest
+import boto3
+from moto import mock_aws
+from src.extract_lambda import list_existing_s3_files #process_and_upload_tables
+import os 
+import logging
+
+
+@pytest.fixture(scope='class')
+def aws_credentials():
+    os.environ["AWS_ACCESS_KEY_ID"] = 'testing'
+    os.environ["AWS_SECRET_ACCESS_KEY"] = 'testing'
+    os.environ["AWS_SECURIT_TOKEN"] = 'testing'
+    os.environ["AWS_SESSION_TOKEN"] = 'testing'
+    os.environ["AWS_DEFAULT_REGION"]= 'eu-west-2'
+
+@pytest.fixture(scope='class')
+def s3_client(aws_credentials):
+    with mock_aws():
+        yield boto3.client('s3')
+
+class TestListExistings3Files():
+    def test_error_if_no_bucket(self, s3_client, caplog):
+
+        logger = logging.getLogger()
+        logger.info('Testing now.')
+        caplog.set_level(logging.ERROR)
+        list_existing_s3_files(client=s3_client)
+        assert 'Error listing S3 objects' in caplog.text
+
+    def test_error_if_bucket_is_empty(self, s3_client, caplog):
+
+        s3_client.create_bucket(Bucket='extract_bucket', 
+                                CreateBucketConfiguration={
+                                    'LocationConstraint': 'eu-west-2'
+                                })
+        list_existing_s3_files(client=s3_client)
+        assert 'The bucket is empty' in caplog.text 
+
+    def test_error_retrieving_object(self, s3_client, caplog):
+        s3_client.upload_file('tests/dummy.txt', 'extract_bucket', 'dummy.txt')
+        list_existing_s3_files(bucket_name='test_bucket', client=s3_client)
+
+        assert 'Error retrieving S3 object ' in caplog.text
+
+    def test_retrieves_file_content(self, s3_client, caplog):
+        result = list_existing_s3_files(client=s3_client)
+
+        assert list(result.values()) == ['This is a test file.'] 
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