diff --git a/protozfits/tests/test_R1_example_file.py b/protozfits/tests/test_R1_example_file.py
index f6cd53f..778a314 100644
--- a/protozfits/tests/test_R1_example_file.py
+++ b/protozfits/tests/test_R1_example_file.py
@@ -1,8 +1,9 @@
-
 import numpy as np
 import pkg_resources
 import os
 
+from protozfits import SimpleFile
+
 example_file_path = pkg_resources.resource_filename(
     'protozfits',
     os.path.join(
@@ -13,20 +14,16 @@
 )
 
 
-def test_can_open_file():
-    from protozfits import SimpleFile
-    SimpleFile(example_file_path)
-
-
 def test_can_iterate_over_events_and_run_header():
-    from protozfits import SimpleFile
-    f = SimpleFile(example_file_path)
 
-    camera_config = next(f.CameraConfig)
-    assert (camera_config.expected_pixels_id == np.arange(14)).all()
+    with SimpleFile(example_file_path) as f:
+
+        camera_config = next(f.CameraConfig)
+        assert (camera_config.expected_pixels_id == np.arange(14)).all()
 
-    for event in f.Events:
-        assert event.waveform.shape == (1120,)
-        assert event.pixel_status.shape == (14,)
-        assert event.lstcam.first_capacitor_id.shape == (16,)
-        assert event.lstcam.counters.shape == (44,)
+        for i, event in enumerate(f.Events):
+            assert event.event_id == i + 1
+            assert event.waveform.shape == (1120,)
+            assert event.pixel_status.shape == (14,)
+            assert event.lstcam.first_capacitor_id.shape == (16,)
+            assert event.lstcam.counters.shape == (44,)