Added specs for DSL error handling

spec/bundler/dsl_spec.rb

@@ -1,12 +1,12 @@
 require 'spec_helper'
 
 describe Bundler::Dsl do
-  describe '#_normalize_options' do
-    before do
-      @rubygems = mock("rubygems")
-      Bundler::Source::Rubygems.stub(:new){ @rubygems }
-    end
+  before do
+    rubygems = mock("rubygems")
+    Bundler::Source::Rubygems.stub(:new){ rubygems }
+  end
 
+  describe '#_normalize_options' do
     it "should convert :github to :git" do
       subject.gem("sparks", :github => "indirect/sparks")
       github_uri = "git://github.com/indirect/sparks.git"
@@ -19,4 +19,15 @@
       subject.dependencies.first.source.uri.should == github_uri
     end
   end
+
+  describe '#method_missing' do
+    it 'should raise an error for unknown DSL methods' do
+      dsl = Bundler::Dsl.new
+      dsl.stub(:caller => ['Gemfile:3'])
+      Bundler.should_receive(:read_file).with('Gemfile').and_return("source :rubygems\ngemspec\nunknown")
+
+      error_msg = "The Gemfile doesn't support the method `unknown`.\nPlease check your Gemfile's syntax at line 3:\n\n  source :rubygems\n  gemspec\n  unknown\n"
+      lambda { dsl.unknown }.should raise_error(Bundler::GemfileError, error_msg)
+    end
+  end
 end