[test] Add additional test coverage for hierarchical configuration

test/fixtures/scripts/nconf-hierarchical-load-save.js

@@ -0,0 +1,32 @@
+/*
+ * nconf-hierarchical-load-save.js: Test fixture for using optimist, envvars and a file store with nconf.
+ *
+ * (C) 2011, Charlie Robbins
+ *
+ */
+
+var fs = require('fs'),
+    path = require('path'),
+    nconf = require('../../../lib/nconf');
+
+//
+// Setup nconf to use (in-order): 
+//   1. Command-line arguments
+//   2. Environment variables
+//   3. A file located at 'path/to/config.json'
+//
+nconf.argv()
+     .env()
+     .file({ file: path.join(__dirname, '..', 'load-save.json') });
+
+//
+// Set a few variables on `nconf`.
+//
+nconf.set('database:host', '127.0.0.1');
+nconf.set('database:port', 5984);
+
+process.stdout.write(nconf.get('foo'));
+//
+// Save the configuration object to disk
+//
+nconf.save();

test/hierarchy-test.js

@@ -6,7 +6,9 @@
  */
 
 var assert = require('assert'),
+    fs = require('fs'),
     path = require('path'),
+    spawn = require('child_process').spawn,
     vows = require('vows'),
     nconf = require('../lib/nconf');
 
@@ -28,6 +30,38 @@ vows.describe('nconf/hierarchy').addBatch({
         assert.equal(nconf.get('color'), 'green');
         assert.equal(nconf.get('movie'), 'Kill Bill');
       }
+    },
+    "configured with .argv(), .env() and .file()": {
+      topic: function () {
+        var configFile = path.join(__dirname, 'fixtures', 'load-save.json'),
+            script = path.join(__dirname, 'fixtures', 'scripts', 'nconf-hierarchical-load-save.js'),
+            argv = ['--foo', 'foo', '--bar', 'bar'],
+            that = this,
+            data = '',
+            child;
+
+        try { fs.unlinkSync(configFile) }
+        catch (ex) { }
+
+        child = spawn('node', [script].concat(argv));
+
+        child.stdout.on('data', function (d) {
+          data += d;
+        });
+
+        child.on('exit', function () {
+          fs.readFile(configFile, 'utf8', that.callback.bind(null, null, data));
+        });
+      },
+      "should not persist information passed in to process.env and process.argv to disk ": function (_, data, _, ondisk){
+        assert.equal(data, 'foo');
+        assert.deepEqual(JSON.parse(ondisk), {
+          database: {
+            host: '127.0.0.1',
+            port: 5984
+          }
+        });
+      }
     }
   }
 }).export(module);