[AIRFLOW-6400] Fix pytest not working on Windows (#6964)

(cherry picked from commit 6dc59d5)

tests/conftest.py

@@ -75,10 +75,11 @@ def breeze_test_helper(request):
     print(" AIRFLOW ".center(60, "="))
 
     # Setup test environment for breeze
-    home = os.getcwd()
-    airflow_home = os.environ.get("AIRFLOW_HOME") or home
-    os.environ["AIRFLOW_SOURCES"] = home
-    os.environ["AIRFLOW__CORE__DAGS_FOLDER"] = os.path.join(home, "tests", "dags")
+    home = os.path.expanduser("~")
+    airflow_home = os.environ.get("AIRFLOW_HOME") or os.path.join(home, "airflow")
+    tests_directory = os.path.dirname(os.path.realpath(__file__))
+
+    os.environ["AIRFLOW__CORE__DAGS_FOLDER"] = os.path.join(tests_directory, "dags")
     os.environ["AIRFLOW__CORE__UNIT_TEST_MODE"] = "True"
     os.environ["AWS_DEFAULT_REGION"] = (
         os.environ.get("AWS_DEFAULT_REGION") or "us-east-1"