From 87f67d9efaf6f897cf0d74e738c2625a21044109 Mon Sep 17 00:00:00 2001
From: Gar <gar+gh@danger.computer>
Date: Wed, 23 Jun 2021 06:53:56 -0700
Subject: [PATCH] chore(tests): expose real mock npm object

Consolidates existing "real npm" mocks, labels it real. We can now
migrate tests to this one at a time instead of trying to make one giant
PR that does it all at once.

PR-URL: https://github.com/npm/cli/pull/3458
Credit: @wraithgar
Close: #3458
Reviewed-by: @nlf
---
 test/fixtures/mock-npm.js           | 59 +++++++++++++++++++++++---
 test/lib/audit.js                   |  2 +-
 test/lib/bin.js                     |  2 +-
 test/lib/birthday.js                |  2 +-
 test/lib/cache.js                   |  2 +-
 test/lib/ci.js                      |  2 +-
 test/lib/cli.js                     | 32 +++++----------
 test/lib/dedupe.js                  | 64 +++++++++++------------------
 test/lib/diff.js                    |  4 +-
 test/lib/dist-tag.js                |  2 +-
 test/lib/docs.js                    |  2 +-
 test/lib/exec.js                    |  2 +-
 test/lib/fund.js                    |  2 +-
 test/lib/help-search.js             |  2 +-
 test/lib/init.js                    |  4 +-
 test/lib/install.js                 |  2 +-
 test/lib/link.js                    |  4 +-
 test/lib/load-all-commands.js       | 18 ++++----
 test/lib/logout.js                  |  2 +-
 test/lib/ls.js                      |  2 +-
 test/lib/npm.js                     | 57 +++++++------------------
 test/lib/outdated.js                |  2 +-
 test/lib/owner.js                   |  2 +-
 test/lib/pack.js                    |  2 +-
 test/lib/ping.js                    |  2 +-
 test/lib/profile.js                 |  2 +-
 test/lib/publish.js                 |  2 +-
 test/lib/rebuild.js                 |  4 +-
 test/lib/repo.js                    |  2 +-
 test/lib/run-script.js              |  4 +-
 test/lib/search.js                  |  4 +-
 test/lib/set-script.js              |  2 +-
 test/lib/shrinkwrap.js              |  2 +-
 test/lib/star.js                    |  2 +-
 test/lib/uninstall.js               |  4 +-
 test/lib/unpublish.js               |  2 +-
 test/lib/update.js                  |  4 +-
 test/lib/utils/read-package-name.js | 10 ++---
 test/lib/version.js                 |  2 +-
 test/lib/view.js                    |  2 +-
 test/lib/whoami.js                  |  2 +-
 41 files changed, 160 insertions(+), 166 deletions(-)

diff --git a/test/fixtures/mock-npm.js b/test/fixtures/mock-npm.js
index c972c35b31861..1de080eb10b4a 100644
--- a/test/fixtures/mock-npm.js
+++ b/test/fixtures/mock-npm.js
@@ -1,9 +1,52 @@
-// Basic npm fixture that you can give a config object that acts like
-// npm.config You still need a separate flatOptions but this is the first step
-// to eventually just using npm itself
+const npmlog = require('npmlog')
+const perf = require('../../lib/utils/perf.js')
+perf.reset()
+const procLog = require('../../lib/utils/proc-log-listener.js')
+procLog.reset()
+
+const realLog = {}
+for (const level of ['silly', 'verbose', 'timing', 'notice', 'warn', 'error'])
+  realLog[level] = npmlog[level]
+
+const { title, execPath } = process
+
+const RealMockNpm = (t, otherMocks = {}) => {
+  t.teardown(() => {
+    for (const level of ['silly', 'verbose', 'timing', 'notice', 'warn', 'error'])
+      npmlog[level] = realLog[level]
+    perf.reset()
+    procLog.reset()
+    process.title = title
+    process.execPath = execPath
+    delete process.env.npm_command
+    delete process.env.COLOR
+  })
+  const logs = []
+  const outputs = []
+  const npm = t.mock('../../lib/npm.js', otherMocks)
+  const command = async (command, args = []) => {
+    return new Promise((resolve, reject) => {
+      npm.commands[command](args, err => {
+        if (err)
+          return reject(err)
+        return resolve()
+      })
+    })
+  }
+  for (const level of ['silly', 'verbose', 'timing', 'notice', 'warn', 'error']) {
+    npmlog[level] = (...msg) => {
+      logs.push([level, ...msg])
+    }
+  }
+  npm.output = (...msg) => outputs.push(msg)
+  return { npm, logs, outputs, command }
+}
 
 const realConfig = require('../../lib/utils/config')
 
+// Basic npm fixture that you can give a config object that acts like
+// npm.config You still need a separate flatOptions. Tests should migrate to
+// using the real npm mock above
 class MockNpm {
   constructor (base = {}) {
     this._mockOutputs = []
@@ -51,7 +94,11 @@ class MockNpm {
   }
 }
 
-// TODO export MockNpm, and change tests to use new MockNpm()
-module.exports = (base = {}) => {
-  return new MockNpm(base)
+const FakeMockNpm = (base = {}) => {
+    return new MockNpm(base)
+}
+
+module.exports = {
+  fake: FakeMockNpm,
+  real: RealMockNpm
 }
diff --git a/test/lib/audit.js b/test/lib/audit.js
index bb6f06debc51f..561765a0270b5 100644
--- a/test/lib/audit.js
+++ b/test/lib/audit.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 t.test('should audit using Arborist', t => {
   let ARB_ARGS = null
diff --git a/test/lib/bin.js b/test/lib/bin.js
index 898e7ba439b88..8ceca8280f52d 100644
--- a/test/lib/bin.js
+++ b/test/lib/bin.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 t.test('bin', (t) => {
   t.plan(4)
diff --git a/test/lib/birthday.js b/test/lib/birthday.js
index 0589be7a8eedb..05660d6fa3f20 100644
--- a/test/lib/birthday.js
+++ b/test/lib/birthday.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 const config = {
   yes: false,
diff --git a/test/lib/cache.js b/test/lib/cache.js
index bad0ede89e101..d3d6f5b8845de 100644
--- a/test/lib/cache.js
+++ b/test/lib/cache.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm.js')
 const path = require('path')
 
 const usageUtil = () => 'usage instructions'
diff --git a/test/lib/ci.js b/test/lib/ci.js
index b60375c289842..b6b2af9c111db 100644
--- a/test/lib/ci.js
+++ b/test/lib/ci.js
@@ -4,7 +4,7 @@ const readdir = util.promisify(fs.readdir)
 
 const t = require('tap')
 
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 t.test('should ignore scripts with --ignore-scripts', (t) => {
   const SCRIPTS = []
diff --git a/test/lib/cli.js b/test/lib/cli.js
index 89c3736e886d2..b85c981cd008b 100644
--- a/test/lib/cli.js
+++ b/test/lib/cli.js
@@ -1,8 +1,6 @@
 const t = require('tap')
 
-// NOTE lib/npm.js is wrapped in t.mock() every time because it's currently a
-// singleton.  In the next semver major we will export the class and lib/cli.js
-// can call `new` on it and then we won't have to do that anymore
+const { real: mockNpm } = require('../fixtures/mock-npm.js')
 
 const unsupportedMock = {
   checkForBrokenNode: () => {},
@@ -36,13 +34,6 @@ const cliMock = (npm) => t.mock('../../lib/cli.js', {
   npmlog: npmlogMock,
 })
 
-const npmOutputs = []
-const npmMock = () => {
-  const npm = t.mock('../../lib/npm.js')
-  npm.output = (...msg) => npmOutputs.push(msg)
-  return npm
-}
-
 const processMock = (proc) => {
   const mocked = {
     ...process,
@@ -59,7 +50,6 @@ const { argv } = process
 t.afterEach(() => {
   logs.length = 0
   process.argv = argv
-  npmOutputs.length = 0
   exitHandlerCalled = null
   exitHandlerNpm = null
 })
@@ -70,7 +60,7 @@ t.test('print the version, and treat npm_g as npm -g', async t => {
     version: process.version,
   })
 
-  const npm = npmMock()
+  const { npm, outputs } = mockNpm(t)
   const cli = cliMock(npm)
   await cli(proc)
 
@@ -82,7 +72,7 @@ t.test('print the version, and treat npm_g as npm -g', async t => {
     ['info', 'using', 'npm@%s', npm.version],
     ['info', 'using', 'node@%s', process.version],
   ])
-  t.strictSame(npmOutputs, [[npm.version]])
+  t.strictSame(outputs, [[npm.version]])
   t.strictSame(exitHandlerCalled, [])
 })
 
@@ -90,7 +80,7 @@ t.test('calling with --versions calls npm version with no args', async t => {
   const proc = processMock({
     argv: ['node', 'npm', 'install', 'or', 'whatever', '--versions'],
   })
-  const npm = npmMock()
+  const { npm, outputs } = mockNpm(t)
   const cli = cliMock(npm)
 
   let versionArgs
@@ -110,7 +100,7 @@ t.test('calling with --versions calls npm version with no args', async t => {
     ['info', 'using', 'node@%s', process.version],
   ])
 
-  t.strictSame(npmOutputs, [])
+  t.strictSame(outputs, [])
   t.strictSame(exitHandlerCalled, [])
 })
 
@@ -119,10 +109,10 @@ t.test('print usage if no params provided', async t => {
     argv: ['node', 'npm'],
   })
 
-  const npm = npmMock()
+  const { npm, outputs } = mockNpm(t)
   const cli = cliMock(npm)
   await cli(proc)
-  t.match(npmOutputs[0][0], 'Usage:', 'outputs npm usage')
+  t.match(outputs[0][0], 'Usage:', 'outputs npm usage')
   t.match(exitHandlerCalled, [], 'should call exitHandler with no args')
   t.ok(exitHandlerNpm, 'exitHandler npm is set')
   t.match(proc.exitCode, 1)
@@ -133,11 +123,11 @@ t.test('print usage if non-command param provided', async t => {
     argv: ['node', 'npm', 'tset'],
   })
 
-  const npm = npmMock()
+  const { npm, outputs } = mockNpm(t)
   const cli = cliMock(npm)
   await cli(proc)
-  t.match(npmOutputs[0][0], 'Unknown command: "tset"')
-  t.match(npmOutputs[0][0], 'Did you mean this?')
+  t.match(outputs[0][0], 'Unknown command: "tset"')
+  t.match(outputs[0][0], 'Did you mean this?')
   t.match(exitHandlerCalled, [], 'should call exitHandler with no args')
   t.ok(exitHandlerNpm, 'exitHandler npm is set')
   t.match(proc.exitCode, 1)
@@ -148,7 +138,7 @@ t.test('load error calls error handler', async t => {
     argv: ['node', 'npm', 'asdf'],
   })
 
-  const npm = npmMock()
+  const { npm } = mockNpm(t)
   const cli = cliMock(npm)
   const er = new Error('test load error')
   npm.load = () => Promise.reject(er)
diff --git a/test/lib/dedupe.js b/test/lib/dedupe.js
index 801e3c96de3cf..30f8a380e8ea3 100644
--- a/test/lib/dedupe.js
+++ b/test/lib/dedupe.js
@@ -1,21 +1,20 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { real: mockNpm } = require('../fixtures/mock-npm')
 
-t.test('should throw in global mode', (t) => {
-  const Dedupe = t.mock('../../lib/dedupe.js')
-  const npm = mockNpm({
-    config: { 'dry-run': false, global: true },
-  })
-  const dedupe = new Dedupe(npm)
-
-  dedupe.exec([], er => {
-    t.match(er, { code: 'EDEDUPEGLOBAL' }, 'throws EDEDUPEGLOBAL')
-    t.end()
-  })
+t.test('should throw in global mode', async (t) => {
+  const { npm, command } = mockNpm(t)
+  await npm.load()
+  npm.config.set('global', true)
+  t.rejects(
+    command('dedupe'),
+    { code: 'EDEDUPEGLOBAL' },
+    'throws EDEDUPEGLOBALE'
+  )
 })
 
-t.test('should remove dupes using Arborist', (t) => {
-  const Dedupe = t.mock('../../lib/dedupe.js', {
+t.test('should remove dupes using Arborist', async (t) => {
+  t.plan(5)
+  const { npm, command } = mockNpm(t, {
     '@npmcli/arborist': function (args) {
       t.ok(args, 'gets options object')
       t.ok(args.path, 'gets path option')
@@ -28,37 +27,24 @@ t.test('should remove dupes using Arborist', (t) => {
       t.ok(arb, 'gets arborist tree')
     },
   })
-  const npm = mockNpm({
-    prefix: 'foo',
-    config: {
-      'dry-run': 'true',
-    },
-  })
-  const dedupe = new Dedupe(npm)
-  dedupe.exec([], er => {
-    if (er)
-      throw er
-    t.ok(true, 'callback is called')
-    t.end()
-  })
+  await npm.load()
+  npm.config.set('prefix', 'foo')
+  npm.config.set('dry-run', 'true')
+  await command('dedupe')
 })
 
-t.test('should remove dupes using Arborist - no arguments', (t) => {
-  const Dedupe = t.mock('../../lib/dedupe.js', {
+t.test('should remove dupes using Arborist - no arguments', async (t) => {
+  t.plan(1)
+  const { npm, command } = mockNpm(t, {
     '@npmcli/arborist': function (args) {
       t.ok(args.dryRun, 'gets dryRun from config')
       this.dedupe = () => {}
     },
     '../../lib/utils/reify-output.js': () => {},
+    '../../lib/utils/reify-finish.js': () => {},
   })
-  const npm = mockNpm({
-    prefix: 'foo',
-    config: {
-      'dry-run': 'true',
-    },
-  })
-  const dedupe = new Dedupe(npm)
-  dedupe.exec(null, () => {
-    t.end()
-  })
+  await npm.load()
+  npm.config.set('prefix', 'foo')
+  npm.config.set('dry-run', true)
+  await command('dedupe')
 })
diff --git a/test/lib/diff.js b/test/lib/diff.js
index 2fb38c9b127e4..fcba802d93b87 100644
--- a/test/lib/diff.js
+++ b/test/lib/diff.js
@@ -1,6 +1,6 @@
-const { resolve, join } = require('path')
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { resolve, join } = require('path')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 const noop = () => null
 let libnpmdiff = noop
diff --git a/test/lib/dist-tag.js b/test/lib/dist-tag.js
index 9af90c309c77c..1fb5cb3b6ee62 100644
--- a/test/lib/dist-tag.js
+++ b/test/lib/dist-tag.js
@@ -1,5 +1,5 @@
-const mockNpm = require('../fixtures/mock-npm')
 const t = require('tap')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 let result = ''
 let log = ''
diff --git a/test/lib/docs.js b/test/lib/docs.js
index 0da070d9a7d13..fbd7584201247 100644
--- a/test/lib/docs.js
+++ b/test/lib/docs.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm.js')
+const { fake: mockNpm } = require('../fixtures/mock-npm.js')
 const { join, sep } = require('path')
 
 const pkgDirs = t.testdir({
diff --git a/test/lib/exec.js b/test/lib/exec.js
index dff067619f2ce..6d99c7959d88e 100644
--- a/test/lib/exec.js
+++ b/test/lib/exec.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 const { resolve, delimiter } = require('path')
 
 const ARB_CTOR = []
diff --git a/test/lib/fund.js b/test/lib/fund.js
index 65778fca50bd7..784989827edc1 100644
--- a/test/lib/fund.js
+++ b/test/lib/fund.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 const version = '1.0.0'
 const funding = {
diff --git a/test/lib/help-search.js b/test/lib/help-search.js
index 845b3873e3cf9..2df862d4fc570 100644
--- a/test/lib/help-search.js
+++ b/test/lib/help-search.js
@@ -1,6 +1,6 @@
 const t = require('tap')
 const { join } = require('path')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 const ansicolors = require('ansicolors')
 
 const OUTPUT = []
diff --git a/test/lib/init.js b/test/lib/init.js
index 44a2af5bcc02b..9b32eabe2c82c 100644
--- a/test/lib/init.js
+++ b/test/lib/init.js
@@ -1,7 +1,7 @@
+const t = require('tap')
 const fs = require('fs')
 const { resolve } = require('path')
-const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 const npmLog = {
   disableProgress: () => null,
diff --git a/test/lib/install.js b/test/lib/install.js
index b7929bddafdba..6412b34c16f25 100644
--- a/test/lib/install.js
+++ b/test/lib/install.js
@@ -1,7 +1,7 @@
 const t = require('tap')
 
 const Install = require('../../lib/install.js')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 t.test('should install using Arborist', (t) => {
   const SCRIPTS = []
diff --git a/test/lib/link.js b/test/lib/link.js
index 64375cfc13c2c..736d18cab9906 100644
--- a/test/lib/link.js
+++ b/test/lib/link.js
@@ -1,9 +1,9 @@
+const t = require('tap')
 const { resolve } = require('path')
 const fs = require('fs')
 
 const Arborist = require('@npmcli/arborist')
-const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 const redactCwd = (path) => {
   const normalizePath = p => p
diff --git a/test/lib/load-all-commands.js b/test/lib/load-all-commands.js
index b3b2012d23aa2..e5f10099cf365 100644
--- a/test/lib/load-all-commands.js
+++ b/test/lib/load-all-commands.js
@@ -3,17 +3,16 @@
 // name, a description, and if it has completion it is a function.  That it
 // renders also ensures that any params we've defined in our commands work.
 const t = require('tap')
-const npm = t.mock('../../lib/npm.js')
+const { real: mockNpm } = require('../fixtures/mock-npm.js')
 const { cmdList } = require('../../lib/utils/cmd-list.js')
 
-let npmOutput = []
-npm.output = (msg) => {
-  npmOutput = msg
-}
+const { npm, outputs } = mockNpm(t)
+
 t.test('load each command', t => {
-  t.plan(cmdList.length + 1)
+  t.plan(cmdList.length)
   npm.load((er) => {
-    t.notOk(er)
+    if (er)
+      throw er
     npm.config.set('usage', true)
     for (const cmd of cmdList.sort((a, b) => a.localeCompare(b, 'en'))) {
       t.test(cmd, t => {
@@ -26,13 +25,14 @@ t.test('load each command', t => {
         t.match(impl.usage, cmd, 'usage contains the command')
         impl([], (err) => {
           t.notOk(err)
-          t.match(npmOutput, impl.usage, 'usage is what is output')
+          t.match(outputs[0][0], impl.usage, 'usage is what is output')
           // This ties usage to a snapshot so we have to re-run snap if usage
           // changes, which rebuilds the man pages
-          t.matchSnapshot(npmOutput)
+          t.matchSnapshot(outputs[0][0])
           t.end()
         })
       })
+      outputs.length = 0
     }
   })
 })
diff --git a/test/lib/logout.js b/test/lib/logout.js
index b130d439c88ca..7cb5c2790d621 100644
--- a/test/lib/logout.js
+++ b/test/lib/logout.js
@@ -1,5 +1,5 @@
-const mockNpm = require('../fixtures/mock-npm')
 const t = require('tap')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 const config = {
   registry: 'https://registry.npmjs.org/',
diff --git a/test/lib/ls.js b/test/lib/ls.js
index 64ece6bd8a3fd..4d6fef52b629e 100644
--- a/test/lib/ls.js
+++ b/test/lib/ls.js
@@ -3,7 +3,7 @@
 // of them contain the tap testdir folders, which are auto-generated and
 // may change when node-tap is updated.
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm.js')
 
 const { resolve } = require('path')
 const { utimesSync } = require('fs')
diff --git a/test/lib/npm.js b/test/lib/npm.js
index 1ccfbbd7ea507..291a58955ceed 100644
--- a/test/lib/npm.js
+++ b/test/lib/npm.js
@@ -1,8 +1,7 @@
 const t = require('tap')
 
 const npmlog = require('npmlog')
-const perf = require('../../lib/utils/perf.js')
-const procLog = require('../../lib/utils/proc-log-listener.js')
+const { real: mockNpm } = require('../fixtures/mock-npm.js')
 
 // delete this so that we don't have configs from the fact that it
 // is being run by 'npm test'
@@ -42,10 +41,6 @@ const bePosix = () => {
 }
 const argv = [...process.argv]
 
-const realLog = {}
-for (const level of ['silly', 'verbose', 'timing', 'notice', 'warn', 'error'])
-  realLog[level] = npmlog[level]
-
 t.afterEach(() => {
   for (const env of Object.keys(process.env).filter(e => /^npm_/.test(e)))
     delete process.env[env]
@@ -55,30 +50,13 @@ t.afterEach(() => {
     value: actualPlatform,
     configurable: true,
   })
-  for (const level of ['silly', 'verbose', 'timing', 'notice', 'warn', 'error'])
-    npmlog[level] = realLog[level]
-  perf.reset()
-  procLog.reset()
 })
 
-const npmMock = () => {
-  const logs = []
-  const outputs = []
-  const npm = t.mock('../../lib/npm.js')
-  for (const level of ['silly', 'verbose', 'timing', 'notice', 'warn', 'error']) {
-    npmlog[level] = (...msg) => {
-      logs.push([level, ...msg])
-    }
-  }
-  npm.output = (...msg) => outputs.push(msg)
-  return { npm, logs, outputs }
-}
-
 const CACHE = t.testdir()
 process.env.npm_config_cache = CACHE
 
 t.test('not yet loaded', t => {
-  const { npm, logs } = npmMock()
+  const { npm, logs } = mockNpm(t)
   t.match(npm, {
     started: Number,
     command: null,
@@ -104,7 +82,7 @@ t.test('not yet loaded', t => {
 
 t.test('npm.load', t => {
   t.test('callback must be a function', t => {
-    const { npm, logs } = npmMock()
+    const { npm, logs } = mockNpm(t)
     const er = new TypeError('callback must be a function if provided')
     t.throws(() => npm.load({}), er)
     t.same(logs, [])
@@ -112,7 +90,7 @@ t.test('npm.load', t => {
   })
 
   t.test('callback style', t => {
-    const { npm } = npmMock()
+    const { npm } = mockNpm(t)
     npm.load((err) => {
       if (err)
         throw err
@@ -122,7 +100,7 @@ t.test('npm.load', t => {
   })
 
   t.test('load error', async t => {
-    const { npm } = npmMock()
+    const { npm } = mockNpm(t)
     const loadError = new Error('load error')
     npm.config.load = async () => {
       throw loadError
@@ -141,7 +119,7 @@ t.test('npm.load', t => {
   })
 
   t.test('basic loading', async t => {
-    const { npm, logs } = npmMock()
+    const { npm, logs } = mockNpm(t)
     const dir = t.testdir({
       node_modules: {},
     })
@@ -209,7 +187,7 @@ t.test('npm.load', t => {
 
   t.test('forceful loading', async t => {
     process.argv = [...process.argv, '--force', '--color', 'always']
-    const { npm, logs } = npmMock()
+    const { npm, logs } = mockNpm(t)
     await npm.load()
     t.match(logs.filter(l => l[0] !== 'timing'), [
       [
@@ -229,7 +207,6 @@ t.test('npm.load', t => {
 
     const PATH = process.env.PATH || process.env.Path
     process.env.PATH = resolve(dir, 'bin')
-    const { execPath } = process
     process.argv = [
       node,
       process.argv[1],
@@ -244,10 +221,9 @@ t.test('npm.load', t => {
 
     t.teardown(() => {
       process.env.PATH = PATH
-      process.execPath = execPath
     })
 
-    const { npm, logs, outputs } = npmMock()
+    const { npm, logs, outputs } = mockNpm(t)
     await npm.load()
     t.equal(npm.config.get('scope'), '@foo', 'added the @ sign to scope')
     t.match(logs.filter(l => l[0] !== 'timing' || !/^config:/.test(l[1])), [
@@ -342,10 +318,8 @@ t.test('npm.load', t => {
       '.npmrc': '',
     })
 
-    const { execPath } = process
-
     process.argv = [
-      execPath,
+      process.execPath,
       process.argv[1],
       '--userconfig',
       resolve(dir, '.npmrc'),
@@ -355,7 +329,7 @@ t.test('npm.load', t => {
       'true',
     ]
 
-    const { npm, outputs } = npmMock()
+    const { npm, outputs } = mockNpm(t)
     await npm.load()
     npm.localPrefix = dir
 
@@ -411,9 +385,8 @@ t.test('npm.load', t => {
         workspaces: ['./packages/*'],
       }),
     })
-    const { execPath } = process
     process.argv = [
-      execPath,
+      process.execPath,
       process.argv[1],
       '--userconfig',
       resolve(dir, '.npmrc'),
@@ -423,7 +396,7 @@ t.test('npm.load', t => {
       '--global',
       'true',
     ]
-    const { npm } = npmMock()
+    const { npm } = mockNpm(t)
     await npm.load()
     npm.localPrefix = dir
     await new Promise((res, rej) => {
@@ -464,7 +437,7 @@ t.test('set process.title', t => {
       '--scope=foo',
       'ls',
     ]
-    const { npm } = npmMock()
+    const { npm } = mockNpm(t)
     await npm.load()
     t.equal(npm.title, 'npm ls')
     t.equal(process.title, 'npm ls')
@@ -480,7 +453,7 @@ t.test('set process.title', t => {
       'revoke',
       'deadbeefcafebad',
     ]
-    const { npm } = npmMock()
+    const { npm } = mockNpm(t)
     await npm.load()
     t.equal(npm.title, 'npm token revoke ***')
     t.equal(process.title, 'npm token revoke ***')
@@ -495,7 +468,7 @@ t.test('set process.title', t => {
       'token',
       'revoke',
     ]
-    const { npm } = npmMock()
+    const { npm } = mockNpm(t)
     await npm.load()
     t.equal(npm.title, 'npm token revoke')
     t.equal(process.title, 'npm token revoke')
diff --git a/test/lib/outdated.js b/test/lib/outdated.js
index 462ec0fc62b6c..34a0aa6c9e03e 100644
--- a/test/lib/outdated.js
+++ b/test/lib/outdated.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 const packument = spec => {
   const mocks = {
diff --git a/test/lib/owner.js b/test/lib/owner.js
index 10ceb03030a5a..32944a84edbc4 100644
--- a/test/lib/owner.js
+++ b/test/lib/owner.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm.js')
+const { fake: mockNpm } = require('../fixtures/mock-npm.js')
 
 let result = ''
 let readPackageNamePrefix = null
diff --git a/test/lib/pack.js b/test/lib/pack.js
index 523ba5d6b535d..3d61abdaf74ca 100644
--- a/test/lib/pack.js
+++ b/test/lib/pack.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 const pacote = require('pacote')
 const path = require('path')
 
diff --git a/test/lib/ping.js b/test/lib/ping.js
index c2d53efef5a7e..f0a10718c46d0 100644
--- a/test/lib/ping.js
+++ b/test/lib/ping.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 t.test('pings', (t) => {
   t.plan(8)
diff --git a/test/lib/profile.js b/test/lib/profile.js
index 17bcf99b9b653..112aa5c3b75e1 100644
--- a/test/lib/profile.js
+++ b/test/lib/profile.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 let result = ''
 const config = {
diff --git a/test/lib/publish.js b/test/lib/publish.js
index e34f00b477ee1..56590478fc1ae 100644
--- a/test/lib/publish.js
+++ b/test/lib/publish.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 const fs = require('fs')
 
 // The way we set loglevel is kind of convoluted, and there is no way to affect
diff --git a/test/lib/rebuild.js b/test/lib/rebuild.js
index e686b6a32ce53..81768a21fb3b7 100644
--- a/test/lib/rebuild.js
+++ b/test/lib/rebuild.js
@@ -1,7 +1,7 @@
+const t = require('tap')
 const fs = require('fs')
 const { resolve } = require('path')
-const mockNpm = require('../fixtures/mock-npm')
-const t = require('tap')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 let result = ''
 
diff --git a/test/lib/repo.js b/test/lib/repo.js
index 0701750b58c63..e1ac90b1e7577 100644
--- a/test/lib/repo.js
+++ b/test/lib/repo.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm.js')
+const { fake: mockNpm } = require('../fixtures/mock-npm.js')
 const { join, sep } = require('path')
 
 const pkgDirs = t.testdir({
diff --git a/test/lib/run-script.js b/test/lib/run-script.js
index 897c80817e254..a3f04ea6790fa 100644
--- a/test/lib/run-script.js
+++ b/test/lib/run-script.js
@@ -1,6 +1,6 @@
-const { resolve } = require('path')
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { resolve } = require('path')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 const normalizePath = p => p
   .replace(/\\+/g, '/')
diff --git a/test/lib/search.js b/test/lib/search.js
index ac894a9e3369d..510a470f48088 100644
--- a/test/lib/search.js
+++ b/test/lib/search.js
@@ -1,6 +1,6 @@
-const Minipass = require('minipass')
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const Minipass = require('minipass')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 const libnpmsearchResultFixture =
   require('../fixtures/libnpmsearch-stream-result.js')
 
diff --git a/test/lib/set-script.js b/test/lib/set-script.js
index 96b455785c509..8038e8db3eb7d 100644
--- a/test/lib/set-script.js
+++ b/test/lib/set-script.js
@@ -1,7 +1,7 @@
 const t = require('tap')
 const fs = require('fs')
 const parseJSON = require('json-parse-even-better-errors')
-const mockNpm = require('../fixtures/mock-npm.js')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 const { resolve } = require('path')
 
 const flatOptions = {}
diff --git a/test/lib/shrinkwrap.js b/test/lib/shrinkwrap.js
index 8bd18f7fbd7c6..ab3b8d0ffe447 100644
--- a/test/lib/shrinkwrap.js
+++ b/test/lib/shrinkwrap.js
@@ -1,6 +1,6 @@
 const t = require('tap')
 const fs = require('fs')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 const config = {
   global: false,
diff --git a/test/lib/star.js b/test/lib/star.js
index 0c584e4a3f0cf..8820d6e9cfb0b 100644
--- a/test/lib/star.js
+++ b/test/lib/star.js
@@ -1,5 +1,5 @@
-const mockNpm = require('../fixtures/mock-npm')
 const t = require('tap')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 let result = ''
 
diff --git a/test/lib/uninstall.js b/test/lib/uninstall.js
index 8cf35bd428d3b..272adb8683602 100644
--- a/test/lib/uninstall.js
+++ b/test/lib/uninstall.js
@@ -1,7 +1,7 @@
+const t = require('tap')
 const fs = require('fs')
 const { resolve } = require('path')
-const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 const npm = mockNpm({
   globalDir: '',
diff --git a/test/lib/unpublish.js b/test/lib/unpublish.js
index 6ad45e958c22f..9199b8aed9442 100644
--- a/test/lib/unpublish.js
+++ b/test/lib/unpublish.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 let result = ''
 const noop = () => null
diff --git a/test/lib/update.js b/test/lib/update.js
index 411d07592a155..487b12e5fa297 100644
--- a/test/lib/update.js
+++ b/test/lib/update.js
@@ -1,6 +1,6 @@
-const { resolve } = require('path')
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { resolve } = require('path')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 const config = {
   depth: 0,
diff --git a/test/lib/utils/read-package-name.js b/test/lib/utils/read-package-name.js
index c8f88bacd4b84..a1a1b4a1504dc 100644
--- a/test/lib/utils/read-package-name.js
+++ b/test/lib/utils/read-package-name.js
@@ -1,17 +1,15 @@
 const t = require('tap')
-const mockNpm = require('../../fixtures/mock-npm')
-const npm = mockNpm()
 
 const readPackageName = require('../../../lib/utils/read-package-name.js')
 
 t.test('read local package.json', async (t) => {
-  npm.prefix = t.testdir({
+  const prefix = t.testdir({
     'package.json': JSON.stringify({
       name: 'my-local-package',
       version: '1.0.0',
     }),
   })
-  const packageName = await readPackageName(npm.prefix)
+  const packageName = await readPackageName(prefix)
   t.equal(
     packageName,
     'my-local-package',
@@ -20,13 +18,13 @@ t.test('read local package.json', async (t) => {
 })
 
 t.test('read local scoped-package.json', async (t) => {
-  npm.prefix = t.testdir({
+  const prefix = t.testdir({
     'package.json': JSON.stringify({
       name: '@my-scope/my-local-package',
       version: '1.0.0',
     }),
   })
-  const packageName = await readPackageName(npm.prefix)
+  const packageName = await readPackageName(prefix)
   t.equal(
     packageName,
     '@my-scope/my-local-package',
diff --git a/test/lib/version.js b/test/lib/version.js
index 6a83375b0025c..df6d0dd797d0a 100644
--- a/test/lib/version.js
+++ b/test/lib/version.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 let result = []
 
diff --git a/test/lib/view.js b/test/lib/view.js
index 4544d7d5d1a94..5f2e5a8add5e9 100644
--- a/test/lib/view.js
+++ b/test/lib/view.js
@@ -3,7 +3,7 @@ const t = require('tap')
 // run the same as tap does when running directly with node
 process.stdout.columns = undefined
 
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 let logs
 const cleanLogs = () => {
diff --git a/test/lib/whoami.js b/test/lib/whoami.js
index 5e350a32ebfb4..9190e3858b137 100644
--- a/test/lib/whoami.js
+++ b/test/lib/whoami.js
@@ -1,5 +1,5 @@
 const t = require('tap')
-const mockNpm = require('../fixtures/mock-npm')
+const { fake: mockNpm } = require('../fixtures/mock-npm')
 
 t.test('whoami', (t) => {
   t.plan(3)