From 4212d900554f4462cd02e749b5acc16cfcbd6ae2 Mon Sep 17 00:00:00 2001
From: Ben Stull <ben.stull@wiggleverse.org>
Date: Thu, 11 Jun 2026 14:39:54 -0700
Subject: [PATCH] =?UTF-8?q?test(f9):=20host=20E2E=20=E2=80=94=20authorship?=
 =?UTF-8?q?=20mode=20marks=20Claude's=20landed=20span?=
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 test/e2e/suite/authorship.test.ts | 74 +++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 test/e2e/suite/authorship.test.ts

diff --git a/test/e2e/suite/authorship.test.ts b/test/e2e/suite/authorship.test.ts
new file mode 100644
index 0000000..b37f4d7
--- /dev/null
+++ b/test/e2e/suite/authorship.test.ts
@@ -0,0 +1,74 @@
+import * as assert from "assert";
+import * as fs from "fs";
+import * as path from "path";
+import * as vscode from "vscode";
+import type { CowritingApi } from "../../../src/extension";
+
+const WS = process.env.E2E_WORKSPACE!;
+const settle = () => new Promise((r) => setTimeout(r, 300));
+
+async function getApi(): Promise<CowritingApi> {
+  const ext = vscode.extensions.getExtension("benstull.vscode-cowriting-plugin")!;
+  const api = (await ext.activate()) as CowritingApi;
+  assert.ok(api?.trackChangesPreviewController && api?.proposalController, "exports preview + proposal");
+  return api;
+}
+
+// F9 host E2E (no LLM): authorship mode reflects Claude's landed span. Owns its
+// own markdown doc, disjoint from the other suites' fixtures.
+suite("F9 authorship preview (host E2E — seam ingress, no LLM)", () => {
+  const DOC_REL = "docs/f9authorship.md";
+  const TARGET = "The sentence Claude will compose over.";
+
+  test("authorship mode marks Claude's accepted edit; track-changes mode still works", async () => {
+    const abs = path.join(WS, DOC_REL);
+    fs.mkdirSync(path.dirname(abs), { recursive: true });
+    fs.writeFileSync(abs, `# F9\n\n${TARGET}\n`, "utf8");
+    const uri = vscode.Uri.file(abs);
+    const doc = await vscode.workspace.openTextDocument(uri);
+    await vscode.window.showTextDocument(doc);
+    await settle();
+    const api = await getApi();
+    const key = uri.toString();
+
+    // open the preview (track-changes mode by default)
+    await vscode.commands.executeCommand("cowriting.showTrackChangesPreview");
+    await settle();
+    assert.ok(api.trackChangesPreviewController.isOpen(key), "preview open");
+    assert.strictEqual(api.trackChangesPreviewController.getMode(key), "changes", "defaults to track-changes");
+
+    // Claude composes via the seam (propose → accept)
+    const start = doc.getText().indexOf(TARGET);
+    const id = await vscode.commands.executeCommand<string>("cowriting.proposeAgentEdit", {
+      uri: key,
+      start,
+      end: start + TARGET.length,
+      newText: "The sentence CLAUDE COMPOSED.",
+      model: "sonnet",
+      sessionId: "e2e-f9",
+      turnId: "turn-f9",
+    });
+    assert.ok(await api.proposalController.acceptById(DOC_REL, id!), "accept applies");
+    await settle();
+
+    // attribution has a Claude span now
+    const claudeSpan = api.attributionController.getSpans(DOC_REL).find((s) => s.authorKind === "agent");
+    assert.ok(claudeSpan, "Claude span recorded by F3");
+
+    // flip to authorship mode → the preview reads a Claude span
+    api.trackChangesPreviewController.setMode(key, "authorship");
+    await settle();
+    assert.strictEqual(api.trackChangesPreviewController.getMode(key), "authorship");
+    const spans = api.attributionController.spansFor(doc);
+    assert.ok(spans.some((s) => s.author === "claude"), "spansFor reports a Claude span for the preview");
+
+    // back to track-changes — still functional (regression)
+    api.trackChangesPreviewController.setMode(key, "changes");
+    await settle();
+    assert.strictEqual(api.trackChangesPreviewController.getMode(key), "changes");
+    assert.ok(
+      (api.trackChangesPreviewController.getLastModel(key) ?? []).length >= 1,
+      "track-changes model still computed",
+    );
+  });
+});