Squashed 'third_party/pi/' content from commit d981de122

git-subtree-dir: third_party/pi
git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477

packages/coding-agent/test/interactive-mode-assistant-diagnostics.test.ts

@@ -0,0 +1,67 @@
+import type { AssistantMessage } from "@earendil-works/pi-ai";
+import { Container } from "@earendil-works/pi-tui";
+import { describe, expect, test } from "vitest";
+import { InteractiveMode } from "../src/modes/interactive/interactive-mode.ts";
+import { initTheme } from "../src/modes/interactive/theme/theme.ts";
+import { stripAnsi } from "../src/utils/ansi.ts";
+
+const message: AssistantMessage = {
+	role: "assistant",
+	content: [{ type: "text", text: "survived" }],
+	api: "anthropic-messages",
+	provider: "anthropic",
+	model: "claude-fable-5-1",
+	usage: {
+		input: 1,
+		output: 1,
+		cacheRead: 0,
+		cacheWrite: 0,
+		totalTokens: 2,
+		cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+	},
+	stopReason: "stop",
+	timestamp: 1,
+	diagnostics: [
+		{
+			type: "anthropic_input_transformations",
+			timestamp: 1,
+			details: {
+				transformations: [
+					{
+						type: "thinking_dropped",
+						path: "messages.2.content.0",
+						reason: "prefix_binding_mismatch",
+					},
+				],
+			},
+		},
+	],
+};
+
+describe("InteractiveMode assistant diagnostics", () => {
+	test("shows Anthropic thinking drops when cache miss notices are enabled", () => {
+		const maybeShowAssistantDiagnostics = Reflect.get(InteractiveMode.prototype, "maybeShowAssistantDiagnostics") as (
+			this: {
+				chatContainer: Container;
+				settingsManager: { getShowCacheMissNotices(): boolean };
+			},
+			message: AssistantMessage,
+		) => void;
+
+		initTheme("dark");
+		const enabled = {
+			chatContainer: new Container(),
+			settingsManager: { getShowCacheMissNotices: () => true },
+		};
+		maybeShowAssistantDiagnostics.call(enabled, message);
+		const output = stripAnsi(enabled.chatContainer.render(120).join("\n"));
+		expect(output).toContain("Anthropic dropped thinking block: prefix_binding_mismatch at messages.2.content.0");
+
+		const disabled = {
+			chatContainer: new Container(),
+			settingsManager: { getShowCacheMissNotices: () => false },
+		};
+		maybeShowAssistantDiagnostics.call(disabled, message);
+		expect(disabled.chatContainer.children).toHaveLength(0);
+	});
+});