expose BurstStruct::Burst#keys

expose @hash.keys through BurstStruct::Burst#keys

lib/yelp/burst_struct.rb

@@ -4,6 +4,10 @@ def initialize(hash = {})
       @hash = hash
     end
 
+    def keys
+      @hash.keys
+    end
+
     def method_missing(method_name, *arguments, &block)
       key = find_key(method_name)
 

spec/yelp/burst_struct_spec.rb

@@ -1,6 +1,14 @@
 require 'yelp/burst_struct'
 
 describe BurstStruct::Burst do
+  describe '#keys' do
+    subject(:struct) { BurstStruct::Burst.new(foo: 'bar', baz: 'qux') }
+
+    it 'should return' do
+      expect(struct.keys).to eql [:foo, :baz]
+    end
+  end
+
   describe '#foo' do
     subject(:struct) { BurstStruct::Burst.new(foo: 'bar') }