Better tests.

Signed-off-by: chatgris <jboyer@af83.com>
Signed-off-by: Laurent Arnoud <larnoud@af83.com>

test/open_exchange_rates_bank_test.rb

@@ -40,8 +40,19 @@
     end
 
     it "should not return 0 with integer rate" do
-      @bank.update_rates
-      @bank.exchange_with(5000.to_money('BBD'), 'USD').cents.wont_equal 0
+      Money::Currency::TABLE[:wtf] = {
+        :priority => 1,
+        :iso_code => "WTF",
+        :name => "WTF",
+        :symbol => "WTF",
+        :subunit => "Cent",
+        :subunit_to_unit => 1000,
+        :separator => ".",
+        :delimiter => ","
+      }
+      Money::Currency::STRINGIFIED_KEYS << 'wtf'
+      @bank.add_rate("USD", "WTF", 2)
+      @bank.exchange_with(5000.to_money('WTF'), 'USD').cents.wont_equal 0
     end
 
     # in response to #4