add reproduction attempt for workdir issue typicode#580

src/__tests__/__fixtures__/workdirs/.gitignore

@@ -0,0 +1,2 @@
+workdirs
+repo

src/__tests__/__fixtures__/workdirs/cleanup.sh

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+#!/bin/sh
+
+set -e
+set -x
+
+rm -rf repo workdirs

src/__tests__/__fixtures__/workdirs/package.json

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+{
+  "name": "husky-workdir-repro",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "husky": "^3.0.8"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "node -p 'require(\"husky/package.json\").version'"
+    }
+  }
+}

src/__tests__/__fixtures__/workdirs/run.sh

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+#!/bin/sh
+
+set -e
+set -x
+
+mkdir -p repos/repo
+cd repos/repo
+git init
+git config user.name 'Test User'
+git config user.email 'test@example.org'
+cp ../package.json .
+npm i
+git add package.json
+[ -f package-lock.json ] && git add package-lock.json
+git commit -m 'init'
+
+mkdir -p ../workdirs
+git worktree add ../workdirs/workdir
+# Preparing worktree (new branch 'workdir')
+# HEAD is now at 6b8dab8 init
+# Can't find Husky, skipping post-checkout hook
+# You can reinstall it using 'npm install husky --save-dev' or delete this hook
+cd  ../workdirs/workdir
+npm i
+cd - # back to "repo" folder
+echo 'node_modules' >> .gitignore
+git add .gitignore
+
+# I expected this to error on the hook, but it didn't
+git commit -m 'add gitignore'