make Enum#valid? specs test the right thing

spec/components/enum_spec.rb

@@ -2,39 +2,37 @@ require 'spec_helper'
 require 'email'
 
 describe Enum do
-
   let(:enum) { Enum.new(:jake, :finn, :princess_bubblegum, :peppermint_butler) }
 
-  context ".[]" do
-    it "allows us to look up a number by symbol" do
+  describe ".[]" do
+    it "looks up a number by symbol" do
       enum[:princess_bubblegum].should == 3
     end
 
-    it "allows us to look up a symbol by number" do
+    it "looks up a symbol by number" do
       enum[2].should == :finn
     end
   end
 
-  context ".valid?" do
-    it "returns true for a value that exists" do
-      enum.valid?(4).should be_false
+  describe ".valid?" do
+    it "returns true if a key exists" do
+      enum.valid?(:finn).should be_true
     end
 
-    it "returns true for a key that doesn't exist" do
-      enum.valid?(:ice_king).should be_false
+    it "returns false if a key does not exist" do
+      enum.valid?(:obama).should be_false
     end
   end
 
-  context ".only" do
+  describe ".only" do
     it "returns only the values we ask for" do
-      enum.only(:jake, :princess_bubblegum).should == {jake: 1, princess_bubblegum: 3}
+      enum.only(:jake, :princess_bubblegum).should == { jake: 1, princess_bubblegum: 3 }
     end
   end
 
-  context ".except" do
-    it "doesn't return the values we don't want" do
-      enum.except(:jake, :princess_bubblegum).should == {finn: 2, peppermint_butler: 4}
+  describe ".except" do
+    it "returns everything but the values we ask to delete" do
+      enum.except(:jake, :princess_bubblegum).should == { finn: 2, peppermint_butler: 4 }
     end
   end
-
 end