Should validate valid params keys

lib/careerjet.rb

@@ -8,8 +8,17 @@ module Careerjet
   class UnknownLocale < ArgumentError
   end
 
-  def self.search(locale, params)
+  class InvalidParam < ArgumentError
+  end
+
+  def self.search(locale, params = {})
     domain = LOCALES.fetch(locale) { raise UnknownLocale, "no domain for locale `#{locale}'" }
+    params.each_key do |k|
+      unless [:keywords, :location, :sort, :start_num, :pagesize, :page, :contracttype,
+          :contractperiod].include? k
+        raise InvalidParam, "Unknown param key `#{k}'"
+      end
+    end
     MultiJson.decode(RestClient::Resource.new(domain)['/devel/search.api'].get(params))
   end
 end

spec/careerjet_spec.rb

@@ -10,6 +10,14 @@
   end
 
   it 'should raise appropriate error on unknown locale' do
-    lambda { Careerjet.search(:foo_Bar, {}) }.should raise_error(Careerjet::UnknownLocale)
+    lambda do
+      Careerjet.search :foo_Bar, {}
+    end.should raise_error(Careerjet::UnknownLocale)
+  end
+
+  it 'should validate given params' do
+    lambda do
+      Careerjet.search :en_US, :keywords => 'rails', :foo => 'bar'
+    end.should raise_error(Careerjet::InvalidParam)
   end
 end