Draft TESTING documentation (#181)

The documentation is lame in that it only contains instructions to
run a single testcase (the one for SQL). But it's a start.

README.md

@@ -390,7 +390,8 @@ Windshaft-cartodb tile server URLs.
 
 
 ### Testing ###
-CartoDB is a large app. We reccomend you use the [spin gem](https://github.com/jstorimer/spin/) to load the main application into memory while you are testing.
+
+See TESTING
 
 ### Contributors ###
 

TESTING

@@ -0,0 +1,12 @@
+The procedure to run cartodb tests is as follows:
+
+  # Prepare test database
+  bundle exec rake db:test:prepare
+
+  # Run all specs
+  # I don't really know, but this is one of them :)
+  rspec spec/lib/sql_test_spec.rb
+
+CartoDB is a large app.
+We reccomend you use the [spin gem](https://github.com/jstorimer/spin/)
+to load the main application into memory while you are testing.