Style: Enforce kebab-case filename (#12265)

tests/integration/print-doc.js

@@ -0,0 +1,30 @@
+"use strict";
+
+/** @type {import('prettier')} */
+const prettier = require("prettier-local");
+
+function printDoc(doc) {
+  // This dummy plugin ignores the input and simply returns the given doc.
+  // This is to make sure that the doc will go through all the stages a real doc
+  // returned by a real plugin would go (e.g. `propagateBreaks`).
+  const dummyPlugin = {
+    parsers: {
+      dummy: {
+        parse: () => ({}),
+        astFormat: "dummy",
+      },
+    },
+    printers: {
+      dummy: {
+        print: () => doc,
+      },
+    },
+  };
+
+  return prettier.format("_", {
+    plugins: [dummyPlugin],
+    parser: "dummy",
+  });
+}
+
+module.exports = printDoc;