feat(xatu): add manual inherit lint

src/xatu/xatu_test.rs

@@ -64,3 +64,16 @@ fn xatu_reports_unquoted_uri() -> googletest::Result<()> {
     );
     Ok(())
 }
+
+#[gtest]
+fn xatu_reports_manual_inherit() -> googletest::Result<()> {
+    let report = xatu::future_sight(vec![fixture_source("testdata/lint_findings.nix")?]).or_fail()?;
+
+    let manual_inherit_count = report
+        .diagnostics
+        .iter()
+        .filter(|diagnostic| diagnostic.finding.rule_id == "manual_inherit")
+        .count();
+    expect_that!(manual_inherit_count, eq(1));
+    Ok(())
+}