read-package-files

- refactor lib/read-package-files.js
- added tests

index.js

@@ -1,35 +1,11 @@
-const fs = require('fs')
-const { promisify } = require('util')
-
 const Arborist = require('@npmcli/arborist')
 const pacote = require('pacote')
-const packlist = require('npm-packlist')
 const rpj = require('read-package-json-fast')
 
 const formatDiff = require('./lib/format-diff.js')
+const readPackageFiles = require('./lib/read-package-files.js')
 const untar = require('./lib/untar.js')
 
-const readPackageFiles = async ({ files, path, prefix, refs }) => {
-  const readFile = promisify(fs.readFile)
-  const stat = promisify(fs.stat)
-  const filenames = await packlist({ path })
-  const read = await Promise.all(
-    filenames.map(filename => Promise.all([
-      filename,
-      readFile(filename, { encoding: 'utf8' }),
-      stat(filename)
-    ]))
-  )
-
-  for (const [filename, content, stat] of read) {
-    files.add(filename)
-    refs.set(`${prefix}${filename}`, {
-      content,
-      mode: stat.mode.toString(8)
-    })
-  }
-}
-
 const diffSelf = async (opts = {}) => {
   const { prefix: path } = opts
 

lib/read-package-files.js

@@ -0,0 +1,27 @@
+const fs = require('fs')
+const { promisify } = require('util')
+const readFile = promisify(fs.readFile)
+const stat = promisify(fs.stat)
+
+const packlist = require('npm-packlist')
+
+const readPackageFiles = async ({ files, path, prefix, refs }) => {
+  const filenames = await packlist({ path })
+  const read = await Promise.all(
+    filenames.map(filename => Promise.all([
+      filename,
+      readFile(filename, { encoding: 'utf8' }),
+      stat(filename)
+    ]))
+  )
+
+  for (const [filename, content, stat] of read) {
+    files.add(filename)
+    refs.set(`${prefix}${filename}`, {
+      content,
+      mode: stat.mode.toString(8)
+    })
+  }
+}
+
+module.exports = readPackageFiles

tap-snapshots/test-read-package-files.js-TAP.test.js

@@ -0,0 +1,18 @@
+/* IMPORTANT
+ * This snapshot file is auto-generated, but designed for humans.
+ * It should be checked into source control and tracked carefully.
+ * Re-generate by setting TAP_SNAPSHOT=1 and running tests.
+ * Make sure to inspect the output below.  Do not ignore changes!
+ */
+'use strict'
+exports[`test/read-package-files.js TAP read files from a package cwd > should return list of filenames 1`] = `
+index.js
+test.js
+package.json
+`
+
+exports[`test/read-package-files.js TAP read files from a package cwd > should return map of filenames to its contents 1`] = `
+a/index.js: true
+a/test.js: true
+a/package.json: true
+`

test/read-package-files.js

@@ -0,0 +1,30 @@
+const t = require('tap')
+
+const readPackageFiles = require('../lib/read-package-files.js')
+
+t.test('read files from a package cwd', async t => {
+  const files = new Set()
+  const refs = new Map()
+
+  const path = t.testdir({
+    'package.json': JSON.stringify({
+      name: 'test-pkg',
+      version: '1.0.0'
+    }),
+    'index.js': 'module.exports = () => "foo"',
+    'test.js': '// TODO'
+  })
+
+  await readPackageFiles({
+    files,
+    path,
+    prefix: 'a/',
+    refs
+  })
+
+  t.matchSnapshot([...files].join('\n'), 'should return list of filenames')
+  t.matchSnapshot(
+    [...refs.entries()].map(([k, v]) => `${k}: ${!!v}`).join('\n'),
+    'should return map of filenames to its contents'
+  )
+})