fix(audit): accept empty OSV source reports

tests/test_security_audit_wrapper.py

@@ -133,8 +133,82 @@ class SecurityAuditWrapperTests(unittest.TestCase):
         )
         path.chmod(0o755)
 
+    def _install_full_mode_stubs(self) -> None:
+        self._write_stub(
+            "trivy",
+            r"""
+            if [[ " $* " == *" --version "* ]]; then
+              echo 'trivy stub 1.0'
+              exit 0
+            fi
+            output=''
+            while [[ $# -gt 0 ]]; do
+              if [[ "$1" == '--output' ]]; then
+                output="$2"
+                shift 2
+              else
+                shift
+              fi
+            done
+            printf '%s\n' '{"version":"2.1.0","runs":[]}' > "$output"
+            """,
+        )
+        self._write_stub(
+            "osv-scanner",
+            r"""
+            if [[ " $* " == *" --version "* ]]; then
+              echo 'osv-scanner stub 1.0'
+              exit 0
+            fi
+            if [[ " $* " == *" scan --help "* ]]; then
+              exit 0
+            fi
+            output=''
+            while [[ $# -gt 0 ]]; do
+              if [[ "$1" == '--output-file' ]]; then
+                output="$2"
+                shift 2
+              else
+                shift
+              fi
+            done
+            printf '{"results": %s}\n' "${STUB_OSV_RESULTS:-null}" > "$output"
+            """,
+        )
+        self._write_stub(
+            "jscpd",
+            r"""
+            if [[ " $* " == *" --version "* ]]; then
+              echo 'jscpd stub 1.0'
+              exit 0
+            fi
+            output=''
+            while [[ $# -gt 0 ]]; do
+              if [[ "$1" == '--output' ]]; then
+                output="$2"
+                shift 2
+              else
+                shift
+              fi
+            done
+            mkdir -p "$output"
+            printf '%s\n' '{"duplicates":[],"statistics":{}}' > "$output/jscpd-report.json"
+            """,
+        )
+        for tool in ("pip-audit", "npm", "radon", "xenon"):
+            self._write_stub(
+                tool,
+                f"""
+                if [[ " $* " == *" --version "* ]]; then
+                  echo '{tool} stub 1.0'
+                  exit 0
+                fi
+                exit 0
+                """,
+            )
+
     def _run(
-        self, *arguments: str, **environment: str
+        self, *arguments: str, mode: str = "quick", **environment: str
     ) -> tuple[subprocess.CompletedProcess[str], Path]:
         reports = self.temporary_root / "reports"
         env = os.environ.copy()
@@ -151,7 +225,7 @@ class SecurityAuditWrapperTests(unittest.TestCase):
                 "bash",
                 str(self.checkout / "tools" / "checks" / AUDIT_SCRIPT.name),
                 "--mode",
-                "quick",
+                mode,
                 "--scope",
                 "current",
                 "--reports-dir",
@@ -215,6 +289,28 @@ class SecurityAuditWrapperTests(unittest.TestCase):
                     (reports / "step-status.tsv").read_text(),
                 )
 
+    def test_osv_null_results_are_valid_but_wrong_shapes_fail(self) -> None:
+        self._install_full_mode_stubs()
+
+        result, reports = self._run("--report-only", mode="full")
+        self.assertEqual(0, result.returncode, result.stderr)
+        osv_report = json.loads(
+            (reports / "osv-scanner-checkout.json").read_text(encoding="utf-8")
+        )
+        self.assertIsNone(osv_report["results"])
+
+        invalid_result, invalid_reports = self._run(
+            "--report-only",
+            mode="full",
+            STUB_OSV_RESULTS="{}",
+        )
+        self.assertEqual(1, invalid_result.returncode)
+        self.assertIn(
+            "invalid OSV-Scanner report",
+            invalid_result.stderr,
+        )
+        self.assertEqual(1, self._manifest(invalid_reports)["execution_error_status"])
+
     def test_workspace_mutation_invalidates_the_audit(self) -> None:
         result, reports = self._run(
             "--report-only",