diff --git a/lolafect/data_testing.py b/lolafect/data_testing.py
index 4a2e1d5..4e4f45e 100644
--- a/lolafect/data_testing.py
+++ b/lolafect/data_testing.py
@@ -1,36 +1,62 @@
 from urllib.parse import quote_plus as urlquote
 
+import prefect
 from prefect import task
-from great_expectations.data_context import BaseDataContext
+from great_expectations.data_context import BaseDataContext, AbstractDataContext
 from great_expectations.data_context.types.base import (
     DataContextConfig,
     DatasourceConfig,
     S3StoreBackendDefaults,
 )
 
+from lolafect.defaults import DEFAULT_GREAT_EXPECTATIONS_S3_BUCKET
+
 
 @task
 def run_data_test_on_mysql(
-    name,
-    mysql_credentials,
-    query,
-    expectations,
-):
-    data_context = create_in_memory_data_context(mysql_credentials)
+    name: str,
+    mysql_credentials: dict,
+    query: str,
+    expectations: dict,
+    great_expectations_s3_bucket: str = DEFAULT_GREAT_EXPECTATIONS_S3_BUCKET,
+) -> dict:
+    """
+    Validate a query and an expectation suite against a given MySQL server.
+
+    :param name: a name for the data test.
+    :param mysql_credentials: credentials for the MySQL instance.
+    :param query: the query to test against.
+    :param expectations: the expectations on the dataset.
+    :param great_expectations_s3_bucket: the bucket where Great Expectations
+    files live.
+    :return: the result of the data test.
+    """
+    logger = prefect.context.get("logger")
+
+    logger.info("Creating data context.")
+    data_context = create_in_memory_data_context(
+        mysql_credentials, great_expectations_s3_bucket
+    )
+    logger.info("Data context created.")
+    logger.info("Creating expectation suite.")
     data_context = create_expectation_suite(data_context, name, expectations)
+    logger.info("Expectation suite created.")
+    logger.info("Creating checkpoint.")
     data_context = create_checkpoint(data_context, mysql_credentials, query, name)
-    results = run_checkpoint(data_context, name)
+    logger.info("Checkpoint created.")
+    logger.info("Running checkpoint.")
+    results = data_context.run_checkpoint(f"{name}_checkpoint")
+    logger.info("Checkpoint finished.")
+    logger.info(f"Validation result: {results['success']}")
 
     return results
 
 
 def create_in_memory_data_context(
     mysql_credentials: dict,
-    database_name="information_schema",
-    great_expectations_bucket_name="pdo-prod-great-expectations",
-):
+    great_expectations_s3_bucket: str,
+) -> AbstractDataContext:
 
-    print("Preparing DataContext.")
     data_context = BaseDataContext(
         project_config=DataContextConfig(
             datasources={
@@ -59,11 +85,10 @@ def create_in_memory_data_context(
                 )
             },
             store_backend_defaults=S3StoreBackendDefaults(
-                default_bucket_name=great_expectations_bucket_name
+                default_bucket_name=great_expectations_s3_bucket
             ),
         )
     )
-    print("DataContext is ready.")
 
     return data_context
 
@@ -71,7 +96,6 @@ def create_in_memory_data_context(
 def create_expectation_suite(
     data_context, expectation_suite_name, expectation_configurations
 ):
-    print("Preparing Expectation Suite.")
     suite = data_context.create_expectation_suite(
         expectation_suite_name,
         overwrite_existing=True,
@@ -82,8 +106,6 @@ def create_expectation_suite(
 
     data_context.save_expectation_suite(suite)
 
-    print("Expectation Suite was stored.")
-
     return data_context
 
 
@@ -91,8 +113,6 @@ def create_checkpoint(
     data_context, mysql_credentials, query_for_checkpoint, expectation_suite_name
 ):
 
-    print("Preparing Checkpoint.")
-
     checkpoint_config = {
         "name": f"{expectation_suite_name}_checkpoint",
         "class_name": "Checkpoint",
@@ -127,19 +147,5 @@ def create_checkpoint(
     # The checkpoint gets persisted. Now it can be called again in a different session.
     data_context.add_checkpoint(**checkpoint_config)
 
-    print("Checkpoint was stored.")
-
     return data_context
 
-
-def run_checkpoint(the_data_context, name):
-
-    print("Running Checkpoint.")
-
-    print(the_data_context)
-
-    results = the_data_context.run_checkpoint(checkpoint_name=f"{name}_checkpoint")
-
-    print("Checkpoint finished.")
-
-    return results
diff --git a/lolafect/defaults.py b/lolafect/defaults.py
index 1d4af84..439a075 100644
--- a/lolafect/defaults.py
+++ b/lolafect/defaults.py
@@ -5,3 +5,4 @@ DEFAULT_KUBERNETES_IMAGE = "373245262072.dkr.ecr.eu-central-1.amazonaws.com/pdo-
 DEFAULT_KUBERNETES_LABELS  = ["k8s"]
 DEFAULT_FLOWS_PATH_IN_BUCKET = "flows/"
 DEFAULT_TRINO_HTTP_SCHEME = "https"
+DEFAULT_GREAT_EXPECTATIONS_S3_BUCKET = "pdo-prod-great-expectations"