1 files changed, 30 insertions, 0 deletions
diff --git a/deps/npm/test/common-tap.js b/deps/npm/test/common-tap.js
index a13a0a7cde..d6d09ed9bc 100644
--- a/deps/npm/test/common-tap.js
+++ b/deps/npm/test/common-tap.js
@@ -1,2 +1,32 @@
+var spawn = require("child_process").spawn
+
 var port = exports.port = 1337
 exports.registry = "http://localhost:" + port
+process.env.npm_config_loglevel = "error"
+
+var bin = exports.bin = require.resolve("../bin/npm-cli.js")
+var once = require("once")
+exports.npm = function (cmd, opts, cb) {
+  cb = once(cb)
+  cmd = [bin].concat(cmd)
+  opts = opts || {}
+
+  var stdout = ""
+    , stderr = ""
+    , node = process.execPath
+    , child = spawn(node, cmd, opts)
+
+  if (child.stderr) child.stderr.on("data", function (chunk) {
+    stderr += chunk
+  })
+
+  if (child.stdout) child.stdout.on("data", function (chunk) {
+    stdout += chunk
+  })
+
+  child.on("error", cb)
+
+  child.on("close", function (code, signal) {
+    cb(null, code, stdout, stderr)
+  })
+}