add test case

Author: King Long Tse

tests/integration/test_export.py

@@ -84,10 +84,13 @@ def test_export_filtered_dates(client,
     regular_export = project.export_labels(download=True)
     assert len(regular_export) == 1
 
-    filtered_export = project.export_labels(download=True,
-                                            start="2020-01-01 00:00:01")
+    filtered_export = project.export_labels(download=True, start="2020-01-01")
     assert len(filtered_export) == 1
 
+    filtered_export_with_time = project.export_labels(
+        download=True, start="2020-01-01 00:00:01")
+    assert len(filtered_export_with_time) == 1
+
     empty_export = project.export_labels(download=True,
                                          start="2020-01-01",
                                          end="2020-01-02")