test: cover history image injection

src/agents/pi-embedded-runner/run/attempt.test.ts

@@ -0,0 +1,55 @@
+import type { AgentMessage } from "@mariozechner/pi-agent-core";
+import type { ImageContent } from "@mariozechner/pi-ai";
+import { describe, expect, it } from "vitest";
+
+import { injectHistoryImagesIntoMessages } from "./attempt.js";
+
+describe("injectHistoryImagesIntoMessages", () => {
+  const image: ImageContent = { type: "image", data: "abc", mimeType: "image/png" };
+
+  it("injects history images and converts string content", () => {
+    const messages: AgentMessage[] = [
+      {
+        role: "user",
+        content: "See /tmp/photo.png",
+      } as AgentMessage,
+    ];
+
+    const didMutate = injectHistoryImagesIntoMessages(messages, new Map([[0, [image]]]));
+
+    expect(didMutate).toBe(true);
+    expect(Array.isArray(messages[0]?.content)).toBe(true);
+    const content = messages[0]?.content as Array<{ type: string; text?: string; data?: string }>;
+    expect(content).toHaveLength(2);
+    expect(content[0]?.type).toBe("text");
+    expect(content[1]).toMatchObject({ type: "image", data: "abc" });
+  });
+
+  it("avoids duplicating existing image content", () => {
+    const messages: AgentMessage[] = [
+      {
+        role: "user",
+        content: [{ type: "text", text: "See /tmp/photo.png" }, { ...image }],
+      } as AgentMessage,
+    ];
+
+    const didMutate = injectHistoryImagesIntoMessages(messages, new Map([[0, [image]]]));
+
+    expect(didMutate).toBe(false);
+    expect((messages[0]?.content as unknown[]).length).toBe(2);
+  });
+
+  it("ignores non-user messages and out-of-range indices", () => {
+    const messages: AgentMessage[] = [
+      {
+        role: "assistant",
+        content: "noop",
+      } as AgentMessage,
+    ];
+
+    const didMutate = injectHistoryImagesIntoMessages(messages, new Map([[1, [image]]]));
+
+    expect(didMutate).toBe(false);
+    expect(messages[0]?.content).toBe("noop");
+  });
+});