add test to exercise editor support for crossref resolution

tests/smoke/filters/editor-support.test.ts

@@ -0,0 +1,45 @@
+/*
+ * editor-support.test.ts
+ *
+ * Copyright (C) 2023 Posit Software, PBC
+ */
+
+import { docs } from "../../utils.ts";
+import { test } from "../../test.ts";
+import { assertEquals } from "testing/asserts.ts";
+
+test({
+  name: "editor-support:crossref",
+  context: {},
+  execute: async () => {
+    let cmdLine: string;
+    switch (Deno.build.os) {
+      case "windows":
+        cmdLine = "../package/dist/bin/quarto.cmd";
+        break;
+      default:
+        cmdLine = "../package/dist/bin/quarto";
+        break;
+    }
+    const cmd = new Deno.Command(cmdLine, {
+      args: ["editor-support", "crossref"],
+      stdin: "piped",
+      stdout: "piped",
+      stderr: "piped",
+    });
+    const child = cmd.spawn();
+    const writer = child.stdin.getWriter();
+    const buf = new TextEncoder().encode(
+      Deno.readTextFileSync(docs("crossrefs/sections.qmd")),
+    );
+    await writer.write(buf);
+    await writer.close();
+    const outputBuf = await child.output();
+    const output = new TextDecoder().decode(outputBuf.stdout);
+    const json = JSON.parse(output);
+    assertEquals(json.entries[0].key, "sec-introduction");
+    assertEquals(json.entries[0].caption, "Introduction");
+  },
+  verify: [],
+  type: "smoke",
+});