improve things

xtask/src/test_js.rs

@@ -0,0 +1,20 @@
+use crate::project_root;
+use anyhow::{bail, Result};
+use std::process::Command;
+
+pub fn main() -> Result<()> {
+    let test_js_root = project_root().join("tests-js");
+    let status = Command::new("yarn").current_dir(&test_js_root).status()?;
+    if !status.success() {
+        bail!("yarn install failed");
+    }
+    let status = Command::new("yarn")
+        .arg("test")
+        .current_dir(&test_js_root)
+        .status()?;
+    if !status.success() {
+        bail!("yarn tests failed");
+    }
+
+    Ok(())
+}