diff --git a/Tests/test_file_bufrstub.py b/Tests/test_file_bufrstub.py
index 76f185b9a..a7714c92c 100644
--- a/Tests/test_file_bufrstub.py
+++ b/Tests/test_file_bufrstub.py
@@ -56,6 +56,7 @@ def test_handler(tmp_path):
 
         def load(self, im):
             self.loaded = True
+            im.fp.close()
             return Image.new("RGB", (1, 1))
 
         def save(self, im, fp, filename):
diff --git a/Tests/test_file_fits.py b/Tests/test_file_fits.py
index 3048827e0..6f988729f 100644
--- a/Tests/test_file_fits.py
+++ b/Tests/test_file_fits.py
@@ -60,6 +60,7 @@ def test_stub_deprecated():
 
         def load(self, im):
             self.loaded = True
+            im.fp.close()
             return Image.new("RGB", (1, 1))
 
     handler = Handler()
diff --git a/Tests/test_file_gribstub.py b/Tests/test_file_gribstub.py
index 768ac12bd..dd1c5e7d2 100644
--- a/Tests/test_file_gribstub.py
+++ b/Tests/test_file_gribstub.py
@@ -56,6 +56,7 @@ def test_handler(tmp_path):
 
         def load(self, im):
             self.loaded = True
+            im.fp.close()
             return Image.new("RGB", (1, 1))
 
         def save(self, im, fp, filename):
diff --git a/Tests/test_file_hdf5stub.py b/Tests/test_file_hdf5stub.py
index 98dc5443c..7ca10fac5 100644
--- a/Tests/test_file_hdf5stub.py
+++ b/Tests/test_file_hdf5stub.py
@@ -57,6 +57,7 @@ def test_handler(tmp_path):
 
         def load(self, im):
             self.loaded = True
+            im.fp.close()
             return Image.new("RGB", (1, 1))
 
         def save(self, im, fp, filename):
diff --git a/Tests/test_imageshow.py b/Tests/test_imageshow.py
index 3e147a9ef..eda485cf6 100644
--- a/Tests/test_imageshow.py
+++ b/Tests/test_imageshow.py
@@ -55,8 +55,8 @@ def test_show_without_viewers():
     viewers = ImageShow._viewers
     ImageShow._viewers = []
 
-    im = hopper()
-    assert not ImageShow.show(im)
+    with hopper() as im:
+        assert not ImageShow.show(im)
 
     ImageShow._viewers = viewers