diff --git a/.env.sample b/.env.sample
index 684e4cb1..6ec09d4a 100644
--- a/.env.sample
+++ b/.env.sample
@@ -1,6 +1,6 @@
-MYSQL_HOST=localhost:3306
+MYSQL_HOST=127.0.0.1
 MYSQL_PORT=3306
-MYSQL_USER=
-MYSQL_PASSWORD=
+MYSQL_USER=root
+MYSQL_PASSWORD=root
 MYSQL_DB_NAME=test_cc
 MYSQL_TABLE_NAME=ccindex
diff --git a/cmoncrawl/aggregator/athena_query.py b/cmoncrawl/aggregator/athena_query.py
index fa052779..8d984dba 100644
--- a/cmoncrawl/aggregator/athena_query.py
+++ b/cmoncrawl/aggregator/athena_query.py
@@ -122,7 +122,7 @@ def __init__(
         max_retry: int = 5,
         extra_sql_where_clause: str | None = None,
         batch_size: int = 1,
-        aws_profile: str = "default",
+        aws_profile: Optional[str] = None,
         bucket_name: Optional[str] = None,
         catalog_name: str = "AwsDataCatalog",
         database_name: str = "commoncrawl",
diff --git a/tests/athena_tests.py b/tests/athena_tests.py
index 50332017..6eac6f6b 100644
--- a/tests/athena_tests.py
+++ b/tests/athena_tests.py
@@ -6,7 +6,7 @@
 from unittest.mock import patch
 
 import boto3
-from tests.utils import MySQLRecordsDB
+from tests.utils import MySQLRecordsDB, set_up_aws_credentials_testing
 import aioboto3
 
 from cmoncrawl.aggregator.athena_query import (
@@ -120,6 +120,7 @@ async def asyncSetUp(self) -> None:
             "https://index.commoncrawl.org/CC-MAIN-2021-09-index",
             "https://index.commoncrawl.org/CC-MAIN-2020-50-index",
         ]
+        set_up_aws_credentials_testing()
 
     def test_prepare_athena_sql_query_multiple_urls(self):
         query = prepare_athena_sql_query(
@@ -242,6 +243,7 @@ def setUp(self) -> None:
         self.mock_s3.start()
         self.mock_athena = mock_athena()
         self.mock_athena.start()
+        set_up_aws_credentials_testing()
 
     def tearDown(self) -> None:
         self.mock_s3.stop()
@@ -546,7 +548,7 @@ async def test_batch_size_zero(self):
 
     async def test_extra_sql_where(self):
         self.domains = ["seznam.cz"]
-        where_clause = "cc.fetch_status != 200"
+        where_clause = 'cc.warc_filename = "filename1"'
         self.iterator = AthenaAggregator.AthenaAggregatorIterator(
             aws_client=self.aws_client,
             domains=self.domains,
diff --git a/tests/utils.py b/tests/utils.py
index 6b4f2d50..e98ae567 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -27,7 +27,7 @@ def seed_db(self):
                     100,
                     200,
                     "CC-MAIN-2021-05",
-                    100,
+                    200,
                     "warc",
                 ],
                 [
@@ -130,3 +130,13 @@ def setUp(self):
     def tearDown(self):
         self.remove_db()
         self.db.close()
+
+
+def set_up_aws_credentials_testing():
+    import os
+
+    os.environ["AWS_ACCESS_KEY_ID"] = "testing"
+    os.environ["AWS_SECRET_ACCESS_KEY"] = "testing"
+    os.environ["AWS_SECURITY_TOKEN"] = "testing"
+    os.environ["AWS_SESSION_TOKEN"] = "testing"
+    os.environ["AWS_DEFAULT_REGION"] = "us-east-1"