diff --git a/.gitignore b/.gitignore
index 7c40b95ca..b68953490 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ oclif.manifest.json
 .local-chromium
 packages/logger/test/client.js
 packages/sdk-utils/test/client.js
+packs
diff --git a/package.json b/package.json
index 77df5999d..ae23e70ae 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
   "scripts": {
     "build": "lerna run build --stream",
     "build:watch": "lerna run build --stream -- --watch",
+    "build:pack": "mkdir -p ./packs && lerna exec npm pack && mv ./packages/*/*.tgz ./packs",
     "bump-version": "lerna version --exact --no-git-tag-version --no-push",
     "chromium-revision": "./scripts/chromium-revision",
     "clean": "git clean -Xdf -e !node_modules -e !**/node_modules/**",
diff --git a/packages/cli/test/commands.test.js b/packages/cli/test/commands.test.js
index c994293de..5046a9169 100644
--- a/packages/cli/test/commands.test.js
+++ b/packages/cli/test/commands.test.js
@@ -5,9 +5,8 @@ import { importCommands } from '../src/commands.js';
 
 describe('CLI commands', () => {
   beforeEach(async () => {
-    await logger.mock();
-    logger.loglevel('debug');
-    mockfs({ $modules: true });
+    await logger.mock({ level: 'debug' });
+    await mockfs({ $modules: true });
   });
 
   describe('from node_modules', () => {
@@ -30,28 +29,28 @@ describe('CLI commands', () => {
     ];
 
     it('imports from dependencies', async () => {
-      mockModuleCommands(path.resolve('.'), mockCmds);
+      await mockModuleCommands(path.resolve('.'), mockCmds);
       await expectAsync(importCommands()).toBeResolvedTo(expectedCmds);
       expect(logger.stdout).toEqual([]);
       expect(logger.stderr).toEqual([]);
     });
 
     it('imports from a parent directory', async () => {
-      mockModuleCommands(path.resolve('../..'), mockCmds);
+      await mockModuleCommands(path.resolve('../..'), mockCmds);
       await expectAsync(importCommands()).toBeResolvedTo(expectedCmds);
       expect(logger.stdout).toEqual([]);
       expect(logger.stderr).toEqual([]);
     });
 
     it('imports from the current project', async () => {
-      mockModuleCommands(process.cwd(), mockCmds);
+      await mockModuleCommands(process.cwd(), mockCmds);
       await expectAsync(importCommands()).toBeResolvedTo(expectedCmds);
       expect(logger.stdout).toEqual([]);
       expect(logger.stderr).toEqual([]);
     });
 
     it('automatically includes package information', async () => {
-      mockModuleCommands(path.resolve('.'), mockCmds);
+      await mockModuleCommands(path.resolve('.'), mockCmds);
       let cmds = await importCommands();
 
       expect(cmds[0].packageInformation.name).toEqual('@percy/cli-config');
@@ -96,7 +95,7 @@ describe('CLI commands', () => {
 
   describe('legacy support', () => {
     it('transforms oclif-like classes', async () => {
-      mockLegacyCommands(process.cwd(), {
+      await mockLegacyCommands(process.cwd(), {
         '@percy/cli-legacy': { name: 'a' },
         '@percy/cli-legacy-topic': { name: 'b', index: true },
         '@percy/cli-legacy-index': { name: 'c', topic: true }
@@ -125,7 +124,7 @@ describe('CLI commands', () => {
     it('runs oclif init hooks', async () => {
       let init = jasmine.createSpy('init');
 
-      mockLegacyCommands(process.cwd(), {
+      await mockLegacyCommands(process.cwd(), {
         'percy-cli-legacy': { name: 'test', init }
       });
 
diff --git a/packages/cli/test/helpers.js b/packages/cli/test/helpers.js
index 8f97b3c3b..8a89011b5 100644
--- a/packages/cli/test/helpers.js
+++ b/packages/cli/test/helpers.js
@@ -10,9 +10,9 @@ export function mockUpdateCache(data, createdAt = Date.now()) {
 }
 
 // Mocks the filesystem and require cache to simulate installed commands
-export function mockModuleCommands(atPath, cmdMocks) {
+export async function mockModuleCommands(atPath, cmdMocks) {
   let modulesPath = `${atPath}/node_modules`;
-  let vol = mockfs({ $modules: true, [modulesPath]: null });
+  let vol = await mockfs({ $modules: true, [modulesPath]: null });
   let write = (rel, str) => vol.fromJSON({ [`${modulesPath}/${rel}`]: str });
 
   // for coverage
@@ -57,7 +57,7 @@ export async function mockPnpCommands(atPath, cmdMocks) {
   findPackageLocator.withArgs(projectInfo.packageLocation).and.returnValue(projectLoc);
   getPackageInformation.withArgs(projectLoc).and.returnValue(projectInfo);
 
-  let vol = mockfs({ $modules: true });
+  let vol = await mockfs({ $modules: true });
   let pnpPath = path.join('/.yarn/berry/cache');
   let write = (fp, str) => vol.fromJSON({ [`${pnpPath}/${fp}`]: str });
 
@@ -80,9 +80,9 @@ export async function mockPnpCommands(atPath, cmdMocks) {
 }
 
 // Mocks the filesystem and require cache to simulate installed legacy commands
-export function mockLegacyCommands(atPath, cmdMocks) {
+export async function mockLegacyCommands(atPath, cmdMocks) {
   let modulesPath = `${atPath}/node_modules`;
-  let vol = mockfs({ $modules: true, [modulesPath]: null });
+  let vol = await mockfs({ $modules: true, [modulesPath]: null });
   let write = (fp, str) => vol.fromJSON({ [`${modulesPath}/${fp}`]: str });
 
   for (let [pkgName, cmdMock] of Object.entries(cmdMocks)) {
diff --git a/packages/cli/test/update.test.js b/packages/cli/test/update.test.js
index 032295813..0ce678757 100644
--- a/packages/cli/test/update.test.js
+++ b/packages/cli/test/update.test.js
@@ -7,7 +7,7 @@ describe('CLI update check', () => {
 
   beforeEach(async () => {
     let pkg = { name: '@percy/cli', version: '1.0.0' };
-    mockfs({ './package.json': JSON.stringify(pkg) });
+    await mockfs({ './package.json': JSON.stringify(pkg) });
     ghAPI = await mockRequests('https://api.github.com');
     await logger.mock();
   });
diff --git a/packages/config/package.json b/packages/config/package.json
index 84ded2fc0..7180a9917 100644
--- a/packages/config/package.json
+++ b/packages/config/package.json
@@ -16,7 +16,7 @@
   "files": [
     "dist",
     "types/index.d.ts",
-    "tests/helpers.js"
+    "test/helpers.js"
   ],
   "main": "./dist/index.js",
   "types": "./types/index.d.ts",
diff --git a/packages/config/test/helpers.js b/packages/config/test/helpers.js
index 6413b09b0..a50e54fa5 100644
--- a/packages/config/test/helpers.js
+++ b/packages/config/test/helpers.js
@@ -3,14 +3,13 @@ import os from 'os';
 import url from 'url';
 import path from 'path';
 import Module from 'module';
-import { Volume, createFsFromVolume } from 'memfs';
-
-import { clearMigrations } from '../src/migrate.js';
-import { resetSchema } from '../src/validate.js';
-import { cache } from '../src/load.js';
 
 // Reset various global @percy/config internals for testing
-export function resetPercyConfig(all) {
+export async function resetPercyConfig(all) {
+  // aliased to src during tests
+  let { clearMigrations } = await import('../dist/migrate.js');
+  let { resetSchema } = await import('../dist/validate.js');
+  let { cache } = await import('../dist/load.js');
   if (all) clearMigrations();
   if (all) resetSchema();
   cache.clear();
@@ -30,7 +29,7 @@ const INTERNAL_FILE_REG = new RegExp(
 );
 
 // Mock and spy on fs methods using an in-memory filesystem
-export function mockfs({
+export async function mockfs({
   // set `true` to allow mocking files within `node_modules` (may cause dynamic import issues)
   $modules = false,
   // list of filepaths or function matchers to allow direct access to the real filesystem
@@ -38,7 +37,8 @@ export function mockfs({
   // initial flat map of files and/or directories to create
   ...initial
 } = {}) {
-  let vol = new Volume();
+  let memfs = await import('memfs');
+  let vol = new memfs.Volume();
 
   // automatically cleanup mock imports
   global.__MOCK_IMPORTS__?.clear();
@@ -81,7 +81,7 @@ export function mockfs({
   };
 
   // mock and install fs methods using the in-memory filesystem
-  let mock = createFsFromVolume(vol);
+  let mock = memfs.createFsFromVolume(vol);
   installFakes(fs.promises, mock.promises);
   installFakes(fs, mock);
 
diff --git a/packages/config/test/index.test.js b/packages/config/test/index.test.js
index 634f9ace7..1e5d359ba 100644
--- a/packages/config/test/index.test.js
+++ b/packages/config/test/index.test.js
@@ -4,9 +4,9 @@ import PercyConfig from '@percy/config';
 
 describe('PercyConfig', () => {
   beforeEach(async () => {
+    await resetPercyConfig(true);
     await logger.mock();
-    resetPercyConfig(true);
-    mockfs();
+    await mockfs();
 
     PercyConfig.addSchema({
       test: {
diff --git a/packages/core/package.json b/packages/core/package.json
index 4ad8f50de..7d8f0109c 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -27,7 +27,8 @@
     "./utils": "./dist/utils.js",
     "./config": "./dist/config.js",
     "./install": "./dist/install.js",
-    "./test/helpers": "./test/helpers/index.js"
+    "./test/helpers": "./test/helpers/index.js",
+    "./test/helpers/server": "./test/helpers/server.js"
   },
   "scripts": {
     "build": "node ../../scripts/build",
diff --git a/packages/core/test/helpers/index.js b/packages/core/test/helpers/index.js
index e46e28056..c42121709 100644
--- a/packages/core/test/helpers/index.js
+++ b/packages/core/test/helpers/index.js
@@ -22,10 +22,10 @@ export async function setupTest({
   loggerTTY,
   apiDelay
 } = {}) {
-  await logger.mock({ isTTY: loggerTTY });
   await api.mock({ delay: apiDelay });
-  resetPercyConfig(resetConfig);
-  mockfs(filesystem);
+  await logger.mock({ isTTY: loggerTTY });
+  await resetPercyConfig(resetConfig);
+  await mockfs(filesystem);
 }
 
 export * from '@percy/client/test/helpers';
diff --git a/packages/core/test/helpers/server.js b/packages/core/test/helpers/server.js
index 532211c8a..05a1b5c4b 100644
--- a/packages/core/test/helpers/server.js
+++ b/packages/core/test/helpers/server.js
@@ -1,4 +1,4 @@
-// aliased to src for coverage during tests without needing to compile this file
+// aliased to src during tests
 import Server from '../../dist/server.js';
 
 export function createTestServer({ default: defaultReply, ...replies }, port = 8000) {
diff --git a/packages/core/test/unit/install.test.js b/packages/core/test/unit/install.test.js
index af29c21a0..d2df10c31 100644
--- a/packages/core/test/unit/install.test.js
+++ b/packages/core/test/unit/install.test.js
@@ -11,7 +11,7 @@ describe('Unit / Install', () => {
 
   beforeEach(async () => {
     await logger.mock({ isTTY: true });
-    mockfs();
+    await mockfs();
 
     // mock a fake download api
     dl = await mockRequests('https://fake-download.org/archive.zip');
diff --git a/packages/core/test/unit/server.test.js b/packages/core/test/unit/server.test.js
index c2b2d515b..42bef97d6 100644
--- a/packages/core/test/unit/server.test.js
+++ b/packages/core/test/unit/server.test.js
@@ -9,9 +9,9 @@ describe('Unit / Server', () => {
     return request(new URL(path, server.address()), ...args);
   }
 
-  beforeEach(() => {
+  beforeEach(async () => {
     server = new Server({ port: 8000 });
-    mockfs();
+    await mockfs();
   });
 
   afterEach(async () => {
diff --git a/packages/logger/test/helpers.js b/packages/logger/test/helpers.js
index 530490935..4c14007ca 100644
--- a/packages/logger/test/helpers.js
+++ b/packages/logger/test/helpers.js
@@ -46,6 +46,10 @@ const helpers = {
   async mock(options = {}) {
     helpers.reset();
 
+    if (options.level) {
+      loglevel(options.level);
+    }
+
     if (process.env.__PERCY_BROWSERIFIED__) {
       spy(Logger.prototype, 'write', function(lvl, msg) {
         let stdio = lvl === 'info' ? 'stdout' : 'stderr';
diff --git a/packages/sdk-utils/test/server.js b/packages/sdk-utils/test/server.js
index 11dbf5e37..9ad54fb53 100644
--- a/packages/sdk-utils/test/server.js
+++ b/packages/sdk-utils/test/server.js
@@ -4,7 +4,7 @@ import path from 'path';
 
 // create a testing context for mocking the local percy server and a local testing site
 export async function context() {
-  let { createTestServer } = await import('@percy/core/test/helpers');
+  let { createTestServer } = await import('@percy/core/test/helpers/server');
 
   let ctx = {
     async call(path, ...args) {