Add spec for resolving compatible module paths

spec/module-cache-spec.coffee

@@ -1,5 +1,7 @@
 path = require 'path'
 Module = require 'module'
+fs = require 'fs-plus'
+temp = require 'temp'
 ModuleCache = require '../src/module-cache'
 
 describe 'ModuleCache', ->
@@ -20,3 +22,34 @@ describe 'ModuleCache', ->
     }
     expect(require('./fixtures/module-cache/file.json').foo).toBe 'bar'
     expect(Module._findPath.callCount).toBe 0
+
+  it 'resolves module paths to a compatible version provided by core', ->
+    packagePath = fs.realpathSync(temp.mkdirSync('atom-package'))
+    ModuleCache.add packagePath, {
+      _atomModuleCache:
+        folders: [{
+          paths: [
+            ""
+          ]
+          dependencies:
+            'underscore-plus': '*'
+        }]
+    }
+    ModuleCache.add atom.getLoadSettings().resourcePath, {
+      _atomModuleCache:
+        dependencies: [{
+          name: 'underscore-plus'
+          version: require('underscore-plus/package.json').version
+          path: path.join('node_modules', 'underscore-plus', 'lib', 'underscore-plus.js')
+        }]
+    }
+
+    indexPath = path.join(packagePath, 'index.js')
+    fs.writeFileSync indexPath, """
+      exports.load = function() {require('underscore-plus');};
+    """
+
+    packageMain = require(indexPath)
+    Module._findPath.reset()
+    packageMain.load()
+    expect(Module._findPath.callCount).toBe 0