test: add script to detect non-existent repos

package.json

@@ -30,6 +30,8 @@
     "hallmark": "^3.0.0",
     "minimist": "^1.2.5",
     "run-parallel-limit": "^1.0.6",
+    "run-series": "^1.1.9",
+    "simple-get": "^4.0.0",
     "tape": "^5.0.1"
   },
   "engines": {

tools/test-exists.js

@@ -0,0 +1,26 @@
+/**
+ * Sanity check that all repos in test.json actually exist on GitHub
+ */
+
+const get = require('simple-get')
+const testPkgs = require('../test/test.json')
+const series = require('run-series')
+
+series(testPkgs.map(function (pkg) {
+  return function (cb) {
+    console.log('checking ' + pkg.repo + '...')
+    get.head(pkg.repo, function (err, res) {
+      if (res.statusCode !== 200) {
+        err = new Error('Non-200 status code ' + res.statusCode)
+      }
+      if (err) {
+        err.message = pkg.name + ': ' + err.message
+        cb(err)
+      } else {
+        cb(null)
+      }
+    })
+  }
+}), function (err) {
+  if (err) throw err
+})