add test for invalid engine

Author: jkrumbiegel

tests/docs/engine/invalid-project/_quarto.yml

@@ -0,0 +1 @@
+engines: ["invalid-engine"]

tests/docs/engine/invalid-project/notebook.qmd

@@ -0,0 +1,19 @@
+import { assertRejects } from "https://deno.land/std/assert/assert_rejects.ts";
+import { quarto } from "../../../src/quarto.ts";
+import { test } from "../../test.ts";
+
+test(
+  {
+    name: "invalid engines option errors",
+    execute: async () => {
+      assertRejects(
+        async () => {await quarto(["render", "docs/engine/invalid-project/notebook.qmd"])},
+        Error,
+        "'invalid-engine' was specified in the list of engines in the project settings but it is not a valid engine",
+      )
+      },
+    type: "smoke",
+    context: {},
+    verify: [],
+  }
+)