it("drops older chunks until the history budget is met", () => {

const { pruned, maxContextTokens } = pruneLargeSimpleHistory();

expect(pruned.droppedChunks).toBeGreaterThan(0);

expect(pruned.droppedChunks).toBe(2);

expect(pruned.keptTokens).toBeLessThanOrEqual(Math.floor(maxContextTokens * 0.5));

expect(pruned.messages.length).toBeGreaterThan(0);

expect(pruned.messages.map((msg) => msg.timestamp)).toEqual([4]);

});

it("keeps the newest messages when pruning", () => {

it("returns droppedMessagesList containing dropped messages", () => {

const { messages, pruned } = pruneLargeSimpleHistory();

expect(pruned.droppedChunks).toBeGreaterThan(0);

expect(pruned.droppedChunks).toBe(2);

expect(pruned.droppedMessagesList.map((msg) => msg.timestamp)).toEqual([1, 2, 3]);

expect(pruned.droppedMessagesList.length).toBe(pruned.droppedMessages);

const allIds = [