Build undo harness guests in the shared target

host/tests/undo_harness.rs

@@ -41,6 +41,45 @@ async fn command(runtime: &Arc<Runtime>, args: &[&str]) -> String {
 #[tokio::test(flavor = "current_thread")]
 async fn tools_restore_one_call_or_the_whole_turn() {
     let target = PathBuf::from(std::env::var("CARGO_TARGET_DIR").unwrap());
+    let repo = Path::new(env!("CARGO_MANIFEST_DIR")).parent().unwrap();
+    assert!(
+        std::process::Command::new("nu")
+            .args(["--no-config-file", "userland/cwd-init/build.nu"])
+            .current_dir(repo)
+            .status()
+            .unwrap()
+            .success()
+    );
+    assert!(
+        std::process::Command::new("cargo")
+            .args([
+                "build",
+                "--release",
+                "--locked",
+                "--target",
+                "wasm32-wasip2",
+                "-p",
+                "git",
+                "-p",
+                "undo",
+                "--target-dir"
+            ])
+            .arg(&target)
+            .args(["-j", "2"])
+            .current_dir(repo.join("userland"))
+            .status()
+            .unwrap()
+            .success()
+    );
+    assert!(
+        std::process::Command::new("nu")
+            .args(["--no-config-file", "userland/brush/build.nu"])
+            .env("CARGO_TARGET_DIR", &target)
+            .current_dir(repo)
+            .status()
+            .unwrap()
+            .success()
+    );
     for since in [false, true] {
         let temp = tempfile::tempdir().unwrap();
         let world = World::open(temp.path()).unwrap();