test: cover relative target normalization

tests/target_normalization.rs

@@ -0,0 +1,32 @@
+use agentcontextmap::analyze;
+use std::fs;
+use std::path::Path;
+
+#[test]
+fn normalizes_safe_parent_components_inside_repository() {
+    let root = tempfile_root();
+    fs::create_dir_all(root.join("src")).unwrap();
+    fs::write(root.join("AGENTS.md"), "Always run tests.\n").unwrap();
+    fs::write(root.join("README.md"), "hello\n").unwrap();
+
+    let analysis = analyze(&root, Some(Path::new("src/../README.md"))).unwrap();
+
+    assert_eq!(analysis.target.as_deref(), Some(Path::new("README.md")));
+    assert_eq!(analysis.sources.len(), 1);
+
+    let _ = fs::remove_dir_all(root);
+}
+
+fn tempfile_root() -> std::path::PathBuf {
+    use std::time::{SystemTime, UNIX_EPOCH};
+    let nonce = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .expect("clock should be after Unix epoch")
+        .as_nanos();
+    let root = std::env::temp_dir().join(format!(
+        "agentcontext-target-normalization-{}-{nonce}",
+        std::process::id()
+    ));
+    fs::create_dir_all(&root).unwrap();
+    root
+}