Update: Add tests for --require flag

test/fixtures/test-module.js

@@ -0,0 +1,4 @@
+console.log('inside test module');
+exports = function() {
+  console.log('inside test module function');
+};

test/flags-require.js

@@ -7,5 +7,19 @@ var fs = require('fs');
 var child = require('child_process');
 
 lab.experiment('flag: --require', function() {
-  lab.test('requires module before running gulpfile');
+  lab.test('requires module before running gulpfile', function(done) {
+    child.exec('node ' + __dirname + '\\..\\bin\\gulp.js --require ./test-module.js --cwd ./test/fixtures', function(err, stdout) {
+      stdout = stdout.replace(/\\/g, '/').split('\n');
+      code.expect(stdout[0]).to.equal('inside test module');
+      code.expect(stdout[1]).to.contain('Requiring external module ./test-module.js');
+      done(err);
+    });
+  });
+  lab.test('errors if module doesn\'t exist', function(done) {
+    child.exec('node ' + __dirname + '\\..\\bin\\gulp.js --require ./null-module.js --cwd ./test/fixtures', function(err, stdout, stderr) {
+      stderr = stderr.replace(/\\/g, '/').split('\n');
+      code.expect(stderr[0]).to.contain('Failed to load external module ./null-module.js');
+      done(err);
+    });
+  });
 });