test(xatu): cover future sight findings

src/xatu/BUILD

@@ -24,6 +24,12 @@ rust_test(
     deps = [":xatu_lib"],
 )
 
+rust_test(
+    name = "xatu_test",
+    srcs = ["xatu_test.rs"],
+    deps = [":xatu_lib"],
+)
+
 rust_binary(
     name = "xatu",
     crate_name = "xatu_cli",

src/xatu/xatu_test.rs

@@ -0,0 +1,26 @@
+use std::path::PathBuf;
+
+use xatu::SourceFile;
+
+fn source_file(path: &str, source: &str) -> SourceFile {
+    SourceFile {
+        path: PathBuf::from(path),
+        source: source.to_owned(),
+    }
+}
+
+#[test]
+fn future_sight_reports_empty_inherit_findings() {
+    let report = xatu::future_sight(vec![
+        source_file("clean.nix", "{ inherit foo; }"),
+        source_file("empty.nix", "{ inherit; }"),
+    ])
+    .expect("sources should parse");
+
+    assert!(!report.is_clean());
+    assert_eq!(1, report.diagnostics.len());
+
+    let diagnostic = &report.diagnostics[0];
+    assert_eq!(PathBuf::from("empty.nix"), report.files.get(diagnostic.file_id).path);
+    assert_eq!("empty_inherit", diagnostic.finding.rule_id);
+}