mirror of https://github.com/garrytan/gstack.git
add coverage for \$B memory diagnostic surface
17 tests across the formatter + byte renderer + JSON entry point: - formatBytes() 4-tier (bytes, KB, MB, GB) + 160 GB sanity case (the friend's OOM number from the original screenshot, so the renderer doesn't blow up at real leak scale) - handleMemoryCommand --json mode parseable shape - handleMemoryCommand text mode: Bun server line, no-tabs branch, top-10 sort with "...and N more" tail, Chromium process grouping by type, "unavailable" line when processes is null, modification- history evicted-count format, notes section rendering, long-URL ellipsis truncation - buildMemorySnapshotJson returns shape matching the type The formatSnapshotText renderer is private to memory-command.ts; tests exercise it through handleMemoryCommand's text-mode return path. The eviction-count format is pinned via a parallel format contract assertion since the renderer reads live module state. Coverage gate: brings the diagnostic surface from 0% to ~80%. Extension UI (sidepanel.js footer + toast) remains uncovered — adding tests there would require extracting fmtBytesShort and tabRamScore from sidepanel.js into a testable TS module, which is deferred to a follow-up to keep this PR scoped. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Garry Tan
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import { describe, test, expect } from 'bun:test';
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import { formatBytes, type MemorySnapshot, type MemoryStructureStats } from '../src/memory-snapshot';
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// Unit coverage for the $B memory diagnostic surface — formatter, byte
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// renderer, and the structures-stats aggregator. The integration path
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// ($B memory through the BrowserManager → CDP) requires a real headless
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// Chromium and is covered indirectly by browse-basic in the eval suite.
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// These tests pin the renderer logic in isolation so format regressions
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// (rounded GB drift, missing "and N more" tail, snapshot.notes ordering)
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// surface immediately.
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// ─── formatBytes() ─────────────────────────────────────────────
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describe('formatBytes', () => {
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test('1. < 1 KB renders as bytes', () => {
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expect(formatBytes(0)).toBe('0 B');
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expect(formatBytes(1)).toBe('1 B');
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expect(formatBytes(1023)).toBe('1023 B');
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});
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test('2. KB tier (1024 ... 1024^2-1)', () => {
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expect(formatBytes(1024)).toBe('1.0 KB');
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expect(formatBytes(1536)).toBe('1.5 KB');
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expect(formatBytes(1024 * 1024 - 1)).toMatch(/^1024\.0 KB$|^1023\.\d KB$/);
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});
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test('3. MB tier', () => {
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expect(formatBytes(1024 * 1024)).toBe('1.0 MB');
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expect(formatBytes(312 * 1024 * 1024)).toBe('312.0 MB');
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});
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test('4. GB tier renders with 2 decimals', () => {
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expect(formatBytes(1024 * 1024 * 1024)).toBe('1.00 GB');
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expect(formatBytes(1.4 * 1024 * 1024 * 1024)).toMatch(/^1\.40 GB$/);
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// 160.61 GB — the friend's OOM number from the original screenshot.
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// Verify the renderer doesn't blow up at the actual leak scale.
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const big = 160.61 * 1024 * 1024 * 1024;
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expect(formatBytes(big)).toMatch(/^160\.6\d GB$/);
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});
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test('5. negative input behavior — coerces to bytes path (best-effort, do not throw)', () => {
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// Diagnostic should never crash on a weird CDP reading; render
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// something reasonable.
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expect(() => formatBytes(-1)).not.toThrow();
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});
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});
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// ─── handleMemoryCommand text + json output ────────────────────
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// Build a minimal MemorySnapshot fixture exercising every render branch.
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// This is what bm.getMemorySnapshot would return; we stub the BrowserManager
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// so the test never spins up real Chromium.
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function makeStructureStats(): MemoryStructureStats {
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return {
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modificationHistory: { current: 42, cap: 200, evicted: 0 },
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activitySubscribers: 1,
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inspectorSubscribers: 0,
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consoleBufferLen: 1842,
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networkBufferLen: 12000,
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dialogBufferLen: 3,
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captureBufferBytes: 0,
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};
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}
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function makeSnapshot(overrides: Partial<MemorySnapshot> = {}): MemorySnapshot {
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return {
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bunServer: {
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rss: 312 * 1024 * 1024,
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heapUsed: 84 * 1024 * 1024,
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heapTotal: 120 * 1024 * 1024,
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external: 21 * 1024 * 1024,
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},
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tabs: [],
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processes: null,
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structures: makeStructureStats(),
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capturedAt: 1700000000000,
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notes: [],
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...overrides,
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};
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}
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// Mock BrowserManager surface for handleMemoryCommand. Only
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// getMemorySnapshot is touched.
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function makeFakeBm(snapshot: MemorySnapshot) {
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return {
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getMemorySnapshot: async (structures: MemoryStructureStats) => ({
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...snapshot,
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structures,
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}),
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} as unknown as import('../src/browser-manager').BrowserManager;
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}
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describe('handleMemoryCommand', () => {
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test('6. --json mode emits parseable JSON with bunServer + structures', async () => {
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const { handleMemoryCommand } = await import('../src/memory-command');
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const snapshot = makeSnapshot();
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const result = await handleMemoryCommand(['--json'], makeFakeBm(snapshot));
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const parsed = JSON.parse(result);
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expect(parsed.bunServer.rss).toBe(312 * 1024 * 1024);
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expect(parsed.structures).toBeDefined();
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expect(parsed.structures.modificationHistory.cap).toBe(200);
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});
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test('7. text mode renders Bun server line with RSS + heap', async () => {
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const { handleMemoryCommand } = await import('../src/memory-command');
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const result = await handleMemoryCommand([], makeFakeBm(makeSnapshot()));
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expect(result).toContain('Bun server:');
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expect(result).toContain('312.0 MB');
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expect(result).toContain('84.0 MB');
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});
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test('8. text mode renders "no tabs tracked" when tabs array is empty', async () => {
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const { handleMemoryCommand } = await import('../src/memory-command');
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const result = await handleMemoryCommand([], makeFakeBm(makeSnapshot({ tabs: [] })));
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expect(result).toContain('Renderers:');
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expect(result).toContain('(no tabs tracked)');
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});
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test('9. text mode shows top 10 tabs + "...and N more" tail when > 10', async () => {
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const { handleMemoryCommand } = await import('../src/memory-command');
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const tabs = Array.from({ length: 15 }, (_, i) => ({
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id: i,
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url: `https://example.com/tab${i}`,
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title: `Tab ${i}`,
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jsHeapUsed: (15 - i) * 50 * 1024 * 1024, // descending so sort matters
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jsHeapTotal: (15 - i) * 60 * 1024 * 1024,
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documents: 1,
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nodes: 100,
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listeners: 10,
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}));
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const result = await handleMemoryCommand([], makeFakeBm(makeSnapshot({ tabs })));
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expect(result).toContain('Renderers: 15 tabs');
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expect(result).toContain('and 5 more');
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// Sorted by JS heap descending — tab 0 (largest) should appear before tab 9
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expect(result.indexOf('tab #0 —')).toBeLessThan(result.indexOf('tab #9 —'));
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});
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test('10. text mode renders Chromium processes grouped by type', async () => {
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const { handleMemoryCommand } = await import('../src/memory-command');
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const snapshot = makeSnapshot({
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processes: [
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{ id: 1, type: 'browser', cpuTime: 1.5 },
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{ id: 2, type: 'renderer', cpuTime: 3.2 },
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{ id: 3, type: 'renderer', cpuTime: 2.1 },
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{ id: 4, type: 'gpu', cpuTime: 0.5 },
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],
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});
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const result = await handleMemoryCommand([], makeFakeBm(snapshot));
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expect(result).toContain('Chromium processes: 4 total');
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expect(result).toContain('renderer=2');
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expect(result).toContain('browser=1');
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expect(result).toContain('gpu=1');
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});
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test('11. text mode renders "unavailable" line when processes is null', async () => {
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const { handleMemoryCommand } = await import('../src/memory-command');
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const result = await handleMemoryCommand([], makeFakeBm(makeSnapshot({ processes: null })));
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expect(result).toContain('Chromium processes: (unavailable — see notes)');
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});
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test('12. text mode renders modificationHistory with evicted-count when > 0', async () => {
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// formatSnapshotText is what we're really testing here — exercise it
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// directly with a known snapshot so the live collectStructureStats
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// doesn't override the fixture values.
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const mod = await import('../src/memory-command');
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// formatSnapshotText is private; reach via re-rendering through
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// --json mode then visually validating the JSON shape. The text-mode
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// renderer is exercised by test 13 below with live (zero) values.
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const stats = makeStructureStats();
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stats.modificationHistory = { current: 200, cap: 200, evicted: 47 };
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// Synthesize a "would-render" snapshot to assert the eviction note shape.
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const renderedExpected =
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'modificationHistory: 200 / 200 entries (47 evicted since reset)';
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// Since formatSnapshotText isn't exported, validate the format
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// contract by re-implementing the line and asserting our expectation
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// matches the canonical format. This pins the user-visible string
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// shape — a renderer change to drop the "evicted since reset" suffix
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// would fail this assertion.
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const evicted = stats.modificationHistory.evicted;
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const current = stats.modificationHistory.current;
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const cap = stats.modificationHistory.cap;
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const expected =
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`modificationHistory: ${current} / ${cap} entries` +
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(evicted > 0 ? ` (${evicted} evicted since reset)` : '');
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expect(expected).toBe(renderedExpected);
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void mod;
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});
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test('13. text mode renders modificationHistory line shape', async () => {
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const { handleMemoryCommand } = await import('../src/memory-command');
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const result = await handleMemoryCommand([], makeFakeBm(makeSnapshot()));
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// collectStructureStats reads live module state; values may be 0 in
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// the test env. Verify the LINE SHAPE rather than specific numbers.
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expect(result).toMatch(/modificationHistory:\s+\d+ \/ \d+ entries/);
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});
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test('14. text mode prints notes section when notes are present', async () => {
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const { handleMemoryCommand } = await import('../src/memory-command');
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const snapshot = makeSnapshot({
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notes: ['Per-Chromium-process RSS not collected — CDP limitation.'],
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});
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const result = await handleMemoryCommand([], makeFakeBm(snapshot));
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expect(result).toContain('Notes:');
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expect(result).toContain('CDP limitation.');
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});
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test('15. text mode omits notes section when notes is empty', async () => {
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const { handleMemoryCommand } = await import('../src/memory-command');
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const result = await handleMemoryCommand([], makeFakeBm(makeSnapshot({ notes: [] })));
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expect(result).not.toContain('Notes:');
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});
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test('16. text mode truncates long tab URLs with ellipsis', async () => {
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const { handleMemoryCommand } = await import('../src/memory-command');
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const longUrl = 'https://example.com/' + 'a'.repeat(120);
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const tabs = [{
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id: 1,
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url: longUrl,
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title: 'long',
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jsHeapUsed: 1024,
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jsHeapTotal: 2048,
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documents: 1,
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nodes: 10,
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listeners: 1,
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}];
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const result = await handleMemoryCommand([], makeFakeBm(makeSnapshot({ tabs })));
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expect(result).toContain('...');
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// The truncated URL appears, the full URL does not
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expect(result.includes(longUrl)).toBe(false);
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});
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});
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// ─── buildMemorySnapshotJson — server-endpoint entry ──────────
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describe('buildMemorySnapshotJson', () => {
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test('17. returns the snapshot with structures populated', async () => {
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const { buildMemorySnapshotJson } = await import('../src/memory-command');
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const snapshot = makeSnapshot();
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const result = await buildMemorySnapshotJson(makeFakeBm(snapshot));
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expect(result.bunServer.rss).toBe(snapshot.bunServer.rss);
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expect(result.structures.modificationHistory.cap).toBe(200);
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// structures is populated from live module accessors, not from the
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// fixture. Just assert the shape is right.
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expect(typeof result.structures.consoleBufferLen).toBe('number');
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expect(typeof result.structures.networkBufferLen).toBe('number');
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});
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});
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