1 files changed, 21 insertions, 0 deletions
diff --git a/scalajslib/test/src/ScalaJsUtils.scala b/scalajslib/test/src/ScalaJsUtils.scala
new file mode 100644
index 00000000..68f2f7ee
--- /dev/null
+++ b/scalajslib/test/src/ScalaJsUtils.scala
@@ -0,0 +1,21 @@
+package mill.scalajslib
+
+import java.io.{FileReader, StringWriter}
+import javax.script.{ScriptContext, ScriptEngineManager}
+
+object ScalaJsUtils {
+  def runJS(path: os.Path): String = {
+    val engineManager = new ScriptEngineManager(null)
+    val engine = engineManager.getEngineByName("nashorn")
+    val console = new Console
+    val bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE)
+    bindings.put("console", console)
+    engine.eval(new FileReader(path.toIO))
+    console.out.toString
+  }
+}
+
+class Console {
+  val out = new StringWriter()
+  def log(s: String): Unit = out.append(s)
+}