Clarify 'things to fix' in README

README.md

@@ -19,10 +19,12 @@ Visit the page in any browser and view the console:
 ## Things to fix
 
 `opal/opal-rspec/fixes.rb` contains a few bug fixes that need to be merged upstream
-to opal itself.
+to opal itself. In app/rspec we have to stub various rspec files.
 
-In app/rspec we have to stub various rspec files (8 currently). This is why,
-and what is needed to fix them:
+### Immutable strings
+
+`opal/opal/rspec/fixes.rb` contains two stub methods as those core rspec methods
+try to use mutable strings, which are not supported in opal.
 
 ### HEREDOCS
 

spec/example_spec.rb

@@ -122,6 +122,16 @@ def some_helper
   end
 end
 
+describe "expect syntax" do
+  it "positive expectation" do
+    expect(100).to eq(100)
+  end
+
+  it "negative expectation" do
+    expect(100).to_not eq(300)
+  end
+end
+
 describe "Normal errors" do
   it "should still work" do
     lambda { raise "wtf son" }.should raise_error(Exception)