Add "make check" rule

The make check rule prepares test database and runs all tests found
to succeed on my personal local deploy. This is a fraction of all
available tests. The list of run tests should grow over time.

In addition to the "check" rule, which does both db preparation and
test run, there's a "check-prepared" rule that assumes a test
database was already prepared and a "prepare-test-db" which only
prepares the database.

Makefile

@@ -0,0 +1,19 @@
+WORKING_SPECS = \
+  spec/lib \
+  spec/models/layer_spec.rb \
+  spec/models/tag_spec.rb \
+  $(NULL)
+
+all:
+	@echo "Try make check"
+
+prepare-test-db:
+	# TODO skip this if db already exists ?
+	bundle exec rake db:test:prepare
+
+check-prepared:
+	bundle exec rspec $(WORKING_SPECS)
+
+check: prepare-test-db check-prepared
+
+

TESTING

@@ -1,6 +1,14 @@
 Testing CartoDB
 ===============
 
+Easy way
+--------
+
+Just run "make check". 
+
+Detailed way
+------------
+
 CartoDB tests are based on [Ruby Spec](http://rspec.info/).
 The procedure to run them is as follows:
 
@@ -24,7 +32,8 @@ Common system configuration issues are reported in this section.
 
    Make sure test.port in config/database.yml is not pointing to
    pg_bouncer, as dynamically created database roles aren't easily
-   supported by it (you need to explicitly list allowed usernames).
+   supported by it (you'd need to explicitly list allowed usernames,
+   and over 70 new users are created during a full testsuite run).
 
 Speeding up test runs
 ---------------------

spec/support/matchers/schema.rb

@@ -57,6 +57,7 @@ RSpec::Matchers.define :pass_sql_tests do
         Dir.glob(glob).each do |f|
           testname = File.basename(f)
           tname = File.basename(f, '.sql')
+          puts "Testing #{tname}"
           expfile = File.dirname(f) + '/' + tname + '_expect'
           cmd = "#{env} psql -X -tA < #{f} #{actual.database_name} 2>&1 | diff -U2 #{expfile} - 2>&1"
           result = `#{cmd}`