1 files changed, 111 insertions, 0 deletions
diff --git a/deps/npm/test/tap/unit-deps-earliestInstallable.js b/deps/npm/test/tap/unit-deps-earliestInstallable.js
new file mode 100644
index 0000000000..26a251addc
--- /dev/null
+++ b/deps/npm/test/tap/unit-deps-earliestInstallable.js
@@ -0,0 +1,111 @@
+'use strict'
+var test = require('tap').test
+var requireInject = require('require-inject')
+
+// we're just mocking to avoid having to call `npm.load`
+var deps = requireInject('../../lib/install/deps.js', {
+  '../../lib/npm.js': {
+    config: {
+      get: function (val) { return (val === 'global-style' || val === 'legacy-bundling') ? false : 'mock' }
+    }
+  }
+})
+
+var earliestInstallable = deps.earliestInstallable
+
+test('earliestInstallable should consider devDependencies', function (t) {
+  var dep1 = {
+    children: [],
+    package: {
+      name: 'dep1',
+      dependencies: { dep2: '2.0.0' }
+    }
+  }
+
+  // a library required by the base package
+  var dep2 = {
+    package: {
+      name: 'dep2',
+      version: '1.0.0'
+    }
+  }
+
+  // an incompatible verson of dep2. required by dep1
+  var dep2a = {
+    package: {
+      name: 'dep2',
+      version: '2.0.0',
+      _from: {
+        raw: 'dep2@1.0.0',
+        scope: null,
+        escapedName: 'dep2',
+        name: 'dep2',
+        rawSpec: '1.0.0',
+        spec: '1.0.0',
+        type: 'version'
+      }
+    },
+    parent: dep1
+  }
+
+  var pkg = {
+    isTop: true,
+    children: [dep1],
+    package: {
+      name: 'pkg',
+      dependencies: { dep1: '1.0.0' },
+      devDependencies: { dep2: '1.0.0' }
+    }
+  }
+
+  dep1.parent = pkg
+  dep2a.parent = dep1
+  dep2.parent = pkg
+
+  var earliest = earliestInstallable(dep1, dep1, dep2a.package)
+  t.isDeeply(earliest, dep1, 'should hoist package when an incompatible devDependency is present')
+  t.end()
+})
+
+test('earliestInstallable should reuse shared prod/dev deps when they are identical', function (t) {
+  var dep1 = {
+    children: [],
+    package: {
+      name: 'dep1',
+      dependencies: { dep2: '1.0.0' }
+    }
+  }
+
+  var dep2 = {
+    package: {
+      name: 'dep2',
+      version: '1.0.0',
+      _from: {
+        raw: 'dep2@^1.0.0',
+        scope: null,
+        escapedName: 'dep2',
+        name: 'dep2',
+        rawSpec: '^1.0.0',
+        spec: '>=1.0.0 <2.0.0',
+        type: 'range'
+      }
+    }
+  }
+
+  var pkg = {
+    isTop: true,
+    children: [dep1],
+    package: {
+      name: 'pkg',
+      dependencies: { dep1: '1.0.0' },
+      devDependencies: { dep2: '^1.0.0' }
+    }
+  }
+
+  dep1.parent = pkg
+  dep2.parent = pkg
+
+  var earliest = earliestInstallable(dep1, dep1, dep2.package)
+  t.isDeeply(earliest, pkg, 'should reuse identical shared dev/prod deps when installing both')
+  t.end()
+})