chore: fix pruner and reify tests for optional peer deps (#8540)

While investigating CI failure in #8537,
I found unrelated test failures when running locally on windows.

`prune with lockfile with implicit optional peer dependencies` fixed by
adding files to fixture `node_modules`, avoiding network, also reduced
package lock to minimum and removed unhelpful snapshots

`move aside symlink clutter` fixed by creating problematic symlink in
`t.testdir()` instead of in `reifyPackages` hook

---------

Co-authored-by: Liam Mitchell <liam.mitchell@mendix.com>

Author: liamcmitchell

workspaces/arborist/tap-snapshots/test/arborist/load-actual.js.test.cjs

@@ -7784,4 +7784,4 @@ ArboristNode {
   "name": "yarn-lock-mkdirp-file-dep",
   "path": "yarn-lock-mkdirp-file-dep",
 }
-`
+`

workspaces/arborist/tap-snapshots/test/arborist/pruner.js.test.cjs

@@ -124,82 +124,6 @@ ArboristNode {
 }
 `
 
-exports[`test/arborist/pruner.js TAP prune with lockfile with implicit optional peer dependencies > should remove all deps from reified tree 1`] = `
-ArboristNode {
-  "children": Map {
-    "dedent" => ArboristNode {
-      "edgesIn": Set {
-        EdgeIn {
-          "from": "",
-          "name": "dedent",
-          "spec": "^1.6.0",
-          "type": "prod",
-        },
-      },
-      "edgesOut": Map {
-        "babel-plugin-macros" => EdgeOut {
-          "name": "babel-plugin-macros",
-          "spec": "^3.1.0",
-          "to": null,
-          "type": "peerOptional",
-        },
-      },
-      "location": "node_modules/dedent",
-      "name": "dedent",
-      "path": "{CWD}/test/arborist/tap-testdir-pruner-prune-with-lockfile-with-implicit-optional-peer-dependencies/node_modules/dedent",
-      "resolved": "https://registry.npmjs.org/dedent/-/dedent-1.6.0.tgz",
-      "version": "1.6.0",
-    },
-  },
-  "edgesOut": Map {
-    "dedent" => EdgeOut {
-      "name": "dedent",
-      "spec": "^1.6.0",
-      "to": "node_modules/dedent",
-      "type": "prod",
-    },
-  },
-  "isProjectRoot": true,
-  "location": "",
-  "name": "tap-testdir-pruner-prune-with-lockfile-with-implicit-optional-peer-dependencies",
-  "packageName": "prune-lockfile-optional-peer",
-  "path": "{CWD}/test/arborist/tap-testdir-pruner-prune-with-lockfile-with-implicit-optional-peer-dependencies",
-  "version": "1.0.0",
-}
-`
-
-exports[`test/arborist/pruner.js TAP prune with lockfile with implicit optional peer dependencies > should remove optional peer dependencies in package-lock.json 1`] = `
-Object {
-  "lockfileVersion": 3,
-  "name": "prune-lockfile-optional-peer",
-  "packages": Object {
-    "": Object {
-      "dependencies": Object {
-        "dedent": "^1.6.0",
-      },
-      "name": "prune-lockfile-optional-peer",
-      "version": "1.0.0",
-    },
-    "node_modules/dedent": Object {
-      "integrity": "sha512-F1Z+5UCFpmQUzJa11agbyPVMbpgT/qA3/SKyJ1jyBgm7dUcUEa8v9JwDkerSQXfakBwFljIxhOJqGkjUwZ9FSA==",
-      "license": "MIT",
-      "peerDependencies": Object {
-        "babel-plugin-macros": "^3.1.0",
-      },
-      "peerDependenciesMeta": Object {
-        "babel-plugin-macros": Object {
-          "optional": true,
-        },
-      },
-      "resolved": "https://registry.npmjs.org/dedent/-/dedent-1.6.0.tgz",
-      "version": "1.6.0",
-    },
-  },
-  "requires": true,
-  "version": "1.0.0",
-}
-`
-
 exports[`test/arborist/pruner.js TAP prune workspaces > must match snapshot 1`] = `
 ArboristNode {
   "children": Map {

workspaces/arborist/test/arborist/pruner.js

@@ -39,32 +39,19 @@ t.test('prune with lockfile', async t => {
 })
 
 t.test('prune with lockfile with implicit optional peer dependencies', async t => {
-  registry.audit({})
-  const opts = {}
-
-  // todo: for some reason on Windows when doing this test NPM looks for
-  //   the cache in the home directory, resulting in an unexpected real
-  //   call being made to the registry
-  if (process.platform === 'win32') {
-    opts.cache = 'C:\\npm\\cache\\_cacache'
-  }
-
   const path = fixture(t, 'prune-lockfile-optional-peer')
-  const tree = await pruneTree(path, opts)
+  const tree = await pruneTree(path, { audit: false })
 
   const dep = tree.children.get('dedent')
-  t.ok(dep, 'required prod dep was pruned from tree')
+  t.ok(dep, 'required prod dep was not pruned from tree')
 
   const optionalPeerDep = tree.children.get('babel-plugin-macros')
-  t.notOk(optionalPeerDep, 'all listed optional peer deps pruned from tree')
+  t.notOk(optionalPeerDep, 'optional peer dep was pruned from tree')
 
-  t.matchSnapshot(
-    require(path + '/package-lock.json'),
-    'should remove optional peer dependencies in package-lock.json'
-  )
-  t.matchSnapshot(
-    printTree(tree),
-    'should remove all deps from reified tree'
+  t.notMatch(
+    fs.readFileSync(path + '/package-lock.json'),
+    'node_modules/babel-plugin-macros',
+    'should remove optional peer dep from package-lock.json'
   )
 })
 

workspaces/arborist/test/arborist/reify.js

@@ -2444,28 +2444,20 @@ t.test('move aside symlink clutter', async t => {
       file: 'do not delete me please',
       'package.json': JSON.stringify({ name: 'ABBREV', version: '1.0.0' }),
     },
-    'sensitivity-test': t.fixture('symlink', './target'),
+    node_modules: {
+      ABBREV: t.fixture('symlink', '../target'),
+    },
   })
 
   // check to see if we're on a case-insensitive fs
   try {
-    const st = fs.lstatSync(path + '/SENSITIVITY-TEST')
+    const st = fs.lstatSync(path + '/node_modules/abbrev')
     t.equal(st.isSymbolicLink(), true, 'fs is case insensitive')
   } catch (er) {
     t.plan(0, 'case sensitive file system, test not relevant')
     return
   }
 
-  const kReifyPackages = Symbol.for('reifyPackages')
-  const reifyPackages = Arborist.prototype[kReifyPackages]
-  t.teardown(() => Arborist.prototype[kReifyPackages] = reifyPackages)
-  Arborist.prototype[kReifyPackages] = async function () {
-    fs.mkdirSync(path + '/node_modules')
-    fs.symlinkSync('../target', path + '/node_modules/ABBREV')
-    Arborist.prototype[kReifyPackages] = reifyPackages
-    return this[kReifyPackages]()
-  }
-
   createRegistry(t, true)
   const tree = await printReified(path)
   const st = fs.lstatSync(path + '/node_modules/abbrev')

workspaces/arborist/test/fixtures/create-reify-case.js

@@ -129,7 +129,7 @@ if (hiddenLocks.length) {
   }
 }
 
-writeFileSync(outFile, `// generated from ${rel}
+writeFileSync(outFile, `// generated from ${rel.replaceAll('\\', '/')}
 module.exports = t => {
   const path = ${output}
   return path