test: Improve coverage for unsupported distros in package_list_parser.py (#2963)

Co-authored-by: Amber Mao <[email protected]>

Author: stvml

cve_bin_tool/package_list_parser.py

@@ -54,12 +54,6 @@ def parse_list(self):
         self.check_file()
         installed_packages = []
         if not input_file.endswith("requirements.txt"):
-            if distro.id() not in SUPPORTED_DISTROS:
-                LOGGER.warning(
-                    f"Package list support only available on {','.join(SUPPORTED_DISTROS)}!"
-                )
-                return {}
-
             system_packages = []
 
             LOGGER.info(f"Scanning {distro.id().capitalize()} package list.")

test/test_package_list_parser.py

@@ -138,3 +138,21 @@ def test_invalid_linux_list(self, filepath, caplog):
     def test_valid_ubuntu_list(self, filepath, parsed_data):
         package_list = PackageListParser(filepath, error_mode=ErrorMode.FullTrace)
         assert package_list.parse_list() == parsed_data
+
+    @pytest.mark.skipif(
+        distro.id() in SUPPORTED_DISTROS,
+        reason="Test for unsupported distros",
+    )
+    @pytest.mark.parametrize(
+        "filepath",
+        [str(TXT_PATH / "test_ubuntu_list.txt")],
+    )
+    def test_unsupported_distros(self, filepath, caplog):
+        package_list = PackageListParser(filepath, error_mode=ErrorMode.FullTrace)
+        expected_output = [
+            f"Package list support only available for {','.join(SUPPORTED_DISTROS)}!"
+        ]
+
+        with pytest.raises(InvalidListError):
+            package_list.parse_list()
+            assert expected_output == [rec.message for rec in caplog.records]