feat: unify provider history context

src/auto-reply/reply/history.test.ts

@@ -0,0 +1,63 @@
+import { describe, expect, it } from "vitest";
+import { CURRENT_MESSAGE_MARKER } from "./mentions.js";
+import {
+  HISTORY_CONTEXT_MARKER,
+  appendHistoryEntry,
+  buildHistoryContext,
+  buildHistoryContextFromEntries,
+} from "./history.js";
+
+describe("history helpers", () => {
+  it("returns current message when history is empty", () => {
+    const result = buildHistoryContext({
+      historyText: "  ",
+      currentMessage: "hello",
+    });
+    expect(result).toBe("hello");
+  });
+
+  it("wraps history entries and excludes current by default", () => {
+    const result = buildHistoryContextFromEntries({
+      entries: [
+        { sender: "A", body: "one" },
+        { sender: "B", body: "two" },
+      ],
+      currentMessage: "current",
+      formatEntry: (entry) => `${entry.sender}: ${entry.body}`,
+    });
+
+    expect(result).toContain(HISTORY_CONTEXT_MARKER);
+    expect(result).toContain("A: one");
+    expect(result).not.toContain("B: two");
+    expect(result).toContain(CURRENT_MESSAGE_MARKER);
+    expect(result).toContain("current");
+  });
+
+  it("trims history to configured limit", () => {
+    const historyMap = new Map<string, { sender: string; body: string }[]>();
+
+    appendHistoryEntry({
+      historyMap,
+      historyKey: "room",
+      limit: 2,
+      entry: { sender: "A", body: "one" },
+    });
+    appendHistoryEntry({
+      historyMap,
+      historyKey: "room",
+      limit: 2,
+      entry: { sender: "B", body: "two" },
+    });
+    appendHistoryEntry({
+      historyMap,
+      historyKey: "room",
+      limit: 2,
+      entry: { sender: "C", body: "three" },
+    });
+
+    expect(historyMap.get("room")?.map((entry) => entry.body)).toEqual([
+      "two",
+      "three",
+    ]);
+  });
+});