test: 添加一大堆测试文件

src/services/compact/__tests__/grouping.test.ts

@@ -0,0 +1,121 @@
+import { describe, expect, test } from "bun:test";
+import { groupMessagesByApiRound } from "../grouping";
+
+function makeMsg(type: "user" | "assistant" | "system", id: string): any {
+  return {
+    type,
+    message: { id, content: `${type}-${id}` },
+  };
+}
+
+describe("groupMessagesByApiRound", () => {
+  // Boundary fires when: assistant msg with NEW id AND current group has items
+  test("splits before first assistant if user messages precede it", () => {
+    const messages = [makeMsg("user", "u1"), makeMsg("assistant", "a1")];
+    const groups = groupMessagesByApiRound(messages);
+    // user msgs form group 1, assistant starts group 2
+    expect(groups).toHaveLength(2);
+    expect(groups[0]).toHaveLength(1);
+    expect(groups[1]).toHaveLength(1);
+  });
+
+  test("single assistant message forms one group", () => {
+    const messages = [makeMsg("assistant", "a1")];
+    const groups = groupMessagesByApiRound(messages);
+    expect(groups).toHaveLength(1);
+  });
+
+  test("splits at new assistant message ID", () => {
+    const messages = [
+      makeMsg("user", "u1"),
+      makeMsg("assistant", "a1"),
+      makeMsg("assistant", "a2"),
+    ];
+    const groups = groupMessagesByApiRound(messages);
+    expect(groups).toHaveLength(3);
+  });
+
+  test("keeps same-ID assistant messages in same group (streaming chunks)", () => {
+    const messages = [
+      makeMsg("assistant", "a1"),
+      makeMsg("assistant", "a1"),
+      makeMsg("assistant", "a1"),
+    ];
+    const groups = groupMessagesByApiRound(messages);
+    expect(groups).toHaveLength(1);
+    expect(groups[0]).toHaveLength(3);
+  });
+
+  test("returns empty array for empty input", () => {
+    expect(groupMessagesByApiRound([])).toEqual([]);
+  });
+
+  test("handles all user messages (no assistant)", () => {
+    const messages = [makeMsg("user", "u1"), makeMsg("user", "u2")];
+    const groups = groupMessagesByApiRound(messages);
+    expect(groups).toHaveLength(1);
+  });
+
+  test("three API rounds produce correct groups", () => {
+    const messages = [
+      makeMsg("user", "u1"),
+      makeMsg("assistant", "a1"),
+      makeMsg("user", "u2"),
+      makeMsg("assistant", "a2"),
+      makeMsg("user", "u3"),
+      makeMsg("assistant", "a3"),
+    ];
+    const groups = groupMessagesByApiRound(messages);
+    // [u1], [a1, u2], [a2, u3], [a3] = 4 groups
+    expect(groups).toHaveLength(4);
+  });
+
+  test("consecutive user messages stay in same group", () => {
+    const messages = [makeMsg("user", "u1"), makeMsg("user", "u2")];
+    expect(groupMessagesByApiRound(messages)).toHaveLength(1);
+  });
+
+  test("does not produce empty groups", () => {
+    const messages = [
+      makeMsg("assistant", "a1"),
+      makeMsg("assistant", "a2"),
+    ];
+    const groups = groupMessagesByApiRound(messages);
+    for (const group of groups) {
+      expect(group.length).toBeGreaterThan(0);
+    }
+  });
+
+  test("handles single message", () => {
+    expect(groupMessagesByApiRound([makeMsg("user", "u1")])).toHaveLength(1);
+  });
+
+  test("preserves message order within groups", () => {
+    const messages = [makeMsg("assistant", "a1"), makeMsg("user", "u2")];
+    const groups = groupMessagesByApiRound(messages);
+    expect(groups[0][0].message.id).toBe("a1");
+    expect(groups[0][1].message.id).toBe("u2");
+  });
+
+  test("handles system messages", () => {
+    const messages = [
+      makeMsg("system", "s1"),
+      makeMsg("assistant", "a1"),
+    ];
+    // system msg is non-assistant, goes to current. Then assistant a1 is new ID
+    // and current has items, so split.
+    const groups = groupMessagesByApiRound(messages);
+    expect(groups).toHaveLength(2);
+  });
+
+  test("tool_result after assistant stays in same round", () => {
+    const messages = [
+      makeMsg("assistant", "a1"),
+      makeMsg("user", "tool_result_1"),
+      makeMsg("assistant", "a1"), // same ID = no new boundary
+    ];
+    const groups = groupMessagesByApiRound(messages);
+    expect(groups).toHaveLength(1);
+    expect(groups[0]).toHaveLength(3);
+  });
+});