Added a failing tests to show multiple vulnerabilities are created for single advisory without aliases

Signed-off-by: Tushar Goel <tushar.goel.dav@gmail.com>

Author: TG1999

vulnerabilities/tests/test_single_advisory_multiple_vulns.py

@@ -0,0 +1,54 @@
+#
+# Copyright (c) nexB Inc. and others. All rights reserved.
+# VulnerableCode is a trademark of nexB Inc.
+# SPDX-License-Identifier: Apache-2.0
+# See http://www.apache.org/licenses/LICENSE-2.0 for the license text.
+# See https://github.com/nexB/vulnerablecode for support or download.
+# See https://aboutcode.org for more information about nexB OSS projects.
+#
+
+from django.test import TestCase
+from packageurl import PackageURL
+from univers.versions import PypiVersion
+
+from vulnerabilities.importer import AffectedPackage
+from vulnerabilities.importer import Reference
+from vulnerabilities.improve_runner import ImproveRunner
+from vulnerabilities.improvers.default import DefaultImprover
+from vulnerabilities.models import Advisory
+from vulnerabilities.models import Vulnerability
+
+
+class TestAdvisoryWihoutAlias(TestCase):
+    def setUp(self):
+        aff_pkg = [
+            AffectedPackage(
+                package=PackageURL(
+                    name="django",
+                    type="pypi",
+                ),
+                fixed_version=PypiVersion("0.1.0"),
+            )
+        ]
+        refs = [
+            Reference(
+                url="test-url",
+                reference_id="test-id",
+            )
+        ]
+        self.advisory = Advisory.objects.create(
+            summary="summary",
+            affected_packages=[pkg.to_dict() for pkg in aff_pkg],
+            references=[ref.to_dict() for ref in refs],
+            date_published="2020-01-01",
+            date_collected="2020-01-01",
+        )
+
+    def test_count_of_vulns(self):
+        # Run the improver twice
+        # We should get single vulnerability for same
+        # advisory when ran through same improver
+        ImproveRunner(DefaultImprover).run()
+        ImproveRunner(DefaultImprover).run()
+        self.assertEqual(Advisory.objects.count(), 1)
+        self.assertEqual(Vulnerability.objects.count(), 1)