diff --git a/deps/npm/test/packages/npm-test-peer-deps-invalid/package.json b/deps/npm/test/packages/npm-test-peer-deps-invalid/package.json
@@ -0,0 +1,12 @@
+{
+  "author": "Domenic Denicola <domenic@domenicdenicola.com> (http://domenicdenicola.com/)",
+  "name": "npm-test-peer-deps-invalid",
+  "version": "0.0.0",
+  "dependencies": {
+    "npm-test-peer-deps-file": "https://raw.github.com/gist/3971128/3f6aa37b4fa1186c2f47da9b77dcc4ec496e3483/index.js",
+    "npm-test-peer-deps-file-invalid": "https://gist.github.com/raw/4303335/861f8d3213061826ab31591840c3cb0ac737f4fc/index.js"
+  },
+  "scripts": {
+    "test": "node test.js"
+  }
+}
diff --git a/deps/npm/test/packages/npm-test-peer-deps-invalid/test.js b/deps/npm/test/packages/npm-test-peer-deps-invalid/test.js
@@ -0,0 +1,31 @@
+var path = require("path")
+var assert = require("assert")
+
+process.env.npm_config_prefix = process.cwd()
+delete process.env.npm_config_global
+delete process.env.npm_config_depth
+
+var npm = process.env.npm_execpath
+
+require("child_process").exec(npm + " ls --json", {
+    env: process.env, cwd: process.cwd() },
+    function (err, stdout, stderr) {
+
+  var actual = JSON.parse(stdout).dependencies
+  var expected = require("./npm-ls.json").dependencies
+
+  // Delete the "problems" entry because it contains system-specific path info,
+  // so we can't compare it accurately and thus have deleted it from
+  // ./npm-ls.json.
+  delete actual.dict.problems
+
+  // It's undefined which peerDependency will get installed first, so
+  // this will be either version 1.1.0 or version 1.0.0
+  var dictVer = actual.dict.version
+  delete actual.dict.version
+  assert(dictVer === "1.1.0" || dictVer === "1.0.0")
+  assert.deepEqual(actual, expected)
+
+  assert.ok(err)
+  assert(/peer invalid/.test(err.message))
+})
diff --git a/deps/npm/test/packages/npm-test-peer-deps/README b/deps/npm/test/packages/npm-test-peer-deps/README
@@ -0,0 +1 @@
+just an npm test
diff --git a/deps/npm/test/packages/npm-test-peer-deps/npm-ls.json b/deps/npm/test/packages/npm-test-peer-deps/npm-ls.json
@@ -0,0 +1,18 @@
+{
+  "name": "npm-test-peer-deps",
+  "version": "0.0.0",
+  "dependencies": {
+    "npm-test-peer-deps-file": {
+      "version": "1.2.3",
+      "from": "https://raw.github.com/gist/3971128/3f6aa37b4fa1186c2f47da9b77dcc4ec496e3483/index.js",
+      "dependencies": {
+        "opener": {
+          "version": "1.3.0"
+        }
+      }
+    },
+    "dict": {
+      "version": "1.1.0"
+    }
+  }
+}
diff --git a/deps/npm/test/packages/npm-test-peer-deps/package.json b/deps/npm/test/packages/npm-test-peer-deps/package.json
@@ -0,0 +1,11 @@
+{
+  "author": "Domenic Denicola <domenic@domenicdenicola.com> (http://domenicdenicola.com/)",
+  "name": "npm-test-peer-deps",
+  "version": "0.0.0",
+  "dependencies": {
+    "npm-test-peer-deps-file": "https://raw.github.com/gist/3971128/3f6aa37b4fa1186c2f47da9b77dcc4ec496e3483/index.js"
+  },
+  "scripts": {
+    "test": "node test.js"
+  }
+}
diff --git a/deps/npm/test/packages/npm-test-peer-deps/test.js b/deps/npm/test/packages/npm-test-peer-deps/test.js
@@ -0,0 +1,20 @@
+var path = require("path")
+var assert = require("assert")
+
+process.env.npm_config_prefix = process.cwd()
+delete process.env.npm_config_global
+delete process.env.npm_config_depth
+
+var npm = process.env.npm_execpath
+
+require("child_process").exec(npm + " ls --json", {
+    env: process.env, cwd: process.cwd() },
+    function (err, stdout, stderr) {
+
+  if (err) throw err
+
+  var actual = JSON.parse(stdout).dependencies
+  var expected = require("./npm-ls.json").dependencies
+
+  assert.deepEqual(actual, expected)
+})