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* @license
* Copyright 2026 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { ContextCompressionService } from './contextCompressionService.js';
import type { Config } from '../config/config.js';
import type { Content } from '@google/genai';
import * as fsSync from 'node:fs';
vi.mock('node:fs/promises', () => ({
readFile: vi.fn(),
writeFile: vi.fn(),
}));
vi.mock('node:fs', async (importOriginal) => {
const actual = await importOriginal<typeof import('node:fs')>();
return {
...actual,
existsSync: vi.fn(),
};
});
describe('ContextCompressionService', () => {
let mockConfig: Partial<Config>;
let service: ContextCompressionService;
const generateContentMock: ReturnType<typeof vi.fn> = vi.fn();
const generateJsonMock: ReturnType<typeof vi.fn> = vi.fn();
beforeEach(() => {
mockConfig = {
storage: {
getProjectTempDir: vi.fn().mockReturnValue('/mock/temp/dir'),
},
isContextManagementEnabled: vi.fn().mockResolvedValue(true),
getBaseLlmClient: vi.fn().mockReturnValue({
generateContent: generateContentMock,
generateJson: generateJsonMock,
}),
} as unknown as Config;
vi.mocked(fsSync.existsSync).mockReturnValue(false);
service = new ContextCompressionService(mockConfig as Config);
});
afterEach(() => {
vi.clearAllMocks();
});
describe('compressHistory', () => {
it('bypasses compression if feature flag is false', async () => {
mockConfig.isContextManagementEnabled = vi.fn().mockResolvedValue(false);
const history: Content[] = [{ role: 'user', parts: [{ text: 'hello' }] }];
const res = await service.compressHistory(history, 'test prompt');
expect(res).toStrictEqual(history);
});
it('protects files that were read within the RECENT_TURNS_PROTECTED window', async () => {
const history: Content[] = [
// Turn 0 & 1 (Old)
{
role: 'model',
parts: [
{
functionCall: {
name: 'read_file',
args: { filepath: 'src/app.ts' },
},
},
],
},
{
role: 'user',
parts: [
{
functionResponse: {
name: 'read_file',
response: {
output: '--- src/app.ts ---\nLine 1\nLine 2\nLine 3',
},
},
},
],
},
// Padding (Turns 2 & 3)
{ role: 'model', parts: [{ text: 'res 1' }] },
{ role: 'user', parts: [{ text: 'res 2' }] },
// Padding (Turns 4 & 5)
{ role: 'model', parts: [{ text: 'res 3' }] },
{ role: 'user', parts: [{ text: 'res 4' }] },
// Recent Turn (Turn 6 & 7, inside window, cutoff is Math.max(0, 8 - 4) = 4)
// Here the model explicitly reads the file again
{
role: 'model',
parts: [
{
functionCall: {
name: 'read_file',
args: { filepath: 'src/app.ts' },
},
},
],
},
{
role: 'user',
parts: [
{
functionResponse: {
name: 'read_file',
response: {
output: '--- src/app.ts ---\nLine 1\nLine 2\nLine 3',
},
},
},
],
},
];
const res = await service.compressHistory(history, 'test prompt');
// Because src/app.ts was re-read recently (index 6 is >= 4), the OLD response at index 1 is PROTECTED.
// It should NOT be compressed.
const compressedOutput =
res[1].parts![0].functionResponse!.response!['output'];
expect(compressedOutput).toBe(
'--- src/app.ts ---\nLine 1\nLine 2\nLine 3',
);
// Verify generateContentMock wasn't called because it bypassed the LLM routing
expect(generateContentMock).not.toHaveBeenCalled();
});
it('compresses files read outside the protected window', async () => {
const history: Content[] = [
// Turn 0: The original function call to read the file
{
role: 'model',
parts: [
{
functionCall: {
name: 'read_file',
args: { filepath: 'src/old.ts' },
},
},
],
},
// Turn 1: The tool output response
{
role: 'user',
parts: [
{
functionResponse: {
name: 'read_file',
response: {
output: '--- src/old.ts ---\nLine 1\nLine 2\nLine 3\nLine 4',
},
},
},
],
},
// Padding turns to push it out of the recent window
{ role: 'model', parts: [{ text: 'msg 2' }] },
{ role: 'user', parts: [{ text: 'res 2' }] },
{ role: 'model', parts: [{ text: 'msg 3' }] },
{ role: 'user', parts: [{ text: 'res 3' }] },
{ role: 'model', parts: [{ text: 'msg 4' }] },
{ role: 'user', parts: [{ text: 'res 4' }] },
];
// Mock the routing request to return PARTIAL
generateJsonMock.mockResolvedValueOnce({
'src/old.ts': {
level: 'PARTIAL',
start_line: 2,
end_line: 3,
},
});
const res = await service.compressHistory(history, 'test prompt');
const compressedOutput =
res[1].parts![0].functionResponse!.response!['output'];
expect(compressedOutput).toContain('[Showing lines 2–3 of 4 in old.ts.');
expect(compressedOutput).toContain('2 | Line 2');
expect(compressedOutput).toContain('3 | Line 3');
});
it('returns SUMMARY and hits cache on subsequent requests', async () => {
const history1: Content[] = [
{
role: 'model',
parts: [
{
functionCall: {
name: 'read_file',
args: { filepath: 'src/index.ts' },
},
},
],
},
{
role: 'user',
parts: [
{
functionResponse: {
name: 'read_file',
response: {
output: `--- src/index.ts ---\nVery long content here...`,
},
},
},
],
},
{ role: 'model', parts: [{ text: 'p1' }] },
{ role: 'user', parts: [{ text: 'p2' }] },
{ role: 'model', parts: [{ text: 'p3' }] },
{ role: 'user', parts: [{ text: 'p4' }] },
{ role: 'model', parts: [{ text: 'p5' }] },
{ role: 'user', parts: [{ text: 'p6' }] },
];
// 1st request: routing says SUMMARY
generateJsonMock.mockResolvedValueOnce({
'src/index.ts': { level: 'SUMMARY' },
});
// 2nd request: the actual summarization call
generateContentMock.mockResolvedValueOnce({
candidates: [
{ content: { parts: [{ text: 'This is a cached summary.' }] } },
],
});
await service.compressHistory(history1, 'test query');
expect(generateJsonMock).toHaveBeenCalledTimes(1);
expect(generateContentMock).toHaveBeenCalledTimes(1);
// Time passes, we get a new query. The file is still old.
const history2: Content[] = [
...history1,
{ role: 'model', parts: [{ text: 'p7' }] },
{ role: 'user', parts: [{ text: 'p8' }] },
];
// 3rd request: routing says SUMMARY again.
generateJsonMock.mockResolvedValueOnce({
'src/index.ts': { level: 'SUMMARY' },
});
const res = await service.compressHistory(history2, 'new query');
// It should NOT make a 3rd fetch call for routing, since content has not changed and state is cached.
expect(generateJsonMock).toHaveBeenCalledTimes(1);
expect(generateContentMock).toHaveBeenCalledTimes(1);
const compressedOutput =
res[1].parts![0].functionResponse!.response!['output'];
expect(compressedOutput).toContain('This is a cached summary.');
});
it('returns unmodified history if structural validation fails', async () => {
// Creating a broken history where functionCall is NOT followed by user functionResponse
const brokenHistory: Content[] = [
{
role: 'model',
parts: [
{
functionCall: {
name: 'read_file',
args: { filepath: 'src/index.ts' },
},
},
],
},
// Missing user functionResponse!
{ role: 'model', parts: [{ text: 'Wait, I am a model again.' }] },
{ role: 'user', parts: [{ text: 'This is invalid.' }] },
{ role: 'model', parts: [{ text: 'Yep.' }] },
{ role: 'user', parts: [{ text: 'Padding.' }] },
{ role: 'model', parts: [{ text: 'Padding.' }] },
];
const res = await service.compressHistory(brokenHistory, 'test query');
// Because it's broken, it should return the exact same array by reference.
expect(res).toBe(brokenHistory);
});
});
});
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