refactor(test): add login_as_admin in global conftest (#20703)

tests/integration_tests/test_app.py

@@ -14,11 +14,20 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+from typing import TYPE_CHECKING
 
-"""
-Here is where we create the app which ends up being shared across all tests.integration_tests. A future
-optimization will be to create a separate app instance for each test class.
-"""
 from superset.app import create_app
 
+if TYPE_CHECKING:
+    from typing import Any
+
+    from flask.testing import FlaskClient
+
 app = create_app()
+
+
+def login(
+    client: "FlaskClient[Any]", username: str = "admin", password: str = "general"
+):
+    resp = client.post("/login/", data=dict(username=username, password=password))
+    assert "User confirmation needed" not in resp