test_verifier: add offline bundle test

Signed-off-by: William Woodruff <william@trailofbits.com>

Author: woodruffw

test/unit/verify/test_verifier.py

@@ -69,16 +69,27 @@ def test_verifier_multiple_verifications(signing_materials, null_policy):
         verifier.verify_artifact(file.read_bytes(), bundle, null_policy)
 
 
+@pytest.mark.online
 @pytest.mark.parametrize(
     "filename", ("bundle.txt", "bundle_v3.txt", "bundle_v3_alt.txt")
 )
-def test_verifier_bundle(signing_bundle, null_policy, mock_staging_tuf, filename):
+def test_verifier_bundle(signing_bundle, null_policy, filename):
     (file, bundle) = signing_bundle(filename)
 
     verifier = Verifier.staging()
     verifier.verify_artifact(file.read_bytes(), bundle, null_policy)
 
 
+@pytest.mark.parametrize(
+    "filename", ("bundle.txt", "bundle_v3.txt", "bundle_v3_alt.txt")
+)
+def test_verifier_bundle_offline(signing_bundle, null_policy, filename):
+    (file, bundle) = signing_bundle(filename)
+
+    verifier = Verifier.staging(offline=True)
+    verifier.verify_artifact(file.read_bytes(), bundle, null_policy)
+
+
 @pytest.mark.staging
 def test_verifier_email_identity(signing_materials):
     verifier = Verifier.staging()