Add test for error message regarding validation problem on _quarto.yml

It should show full path of the YAML and so give hint that the wrong YAML could have been used.

Follow up on 54bbd97 that closed #10125

tests/docs/yaml/bad-config-yaml/.gitignore

@@ -0,0 +1 @@
+/.quarto/

tests/docs/yaml/bad-config-yaml/_quarto.yml

@@ -0,0 +1,3 @@
+project:
+  title: "bad-config-yaml"
+  type: 1

tests/docs/yaml/bad-config-yaml/subfolder/bad-config-yaml.qmd

@@ -0,0 +1,7 @@
+---
+title: "bad-config-yaml"
+---
+
+## Quarto
+
+This is a doc in a dummy project to check that error message is correct

tests/smoke/yaml/config-yaml-validation.test.ts

@@ -0,0 +1,18 @@
+/*
+* config-yaml-validation.test.ts
+*
+* Copyright (C) 2024 Posit Software, PBC
+*
+*/
+
+import { testQuartoCmd } from "../../test.ts";
+import { docs } from "../../utils.ts";
+import { printsMessage } from "../../verify.ts";
+
+const input = docs("yaml/bad-config-yaml/subfolder/bad-config-yaml.qmd");
+
+testQuartoCmd(
+  "render",
+  [input],
+  [printsMessage("ERROR", /bad-config-yaml[\/\\]+_quarto[.]yml validation failed/)]
+);