Travis changed their default distribution from Ubuntu 14.04 (trusty) to 16.04 (precise). This might break your test setup for new builds.

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You can solve this issue by freezing your test distribution in the .travis.yml to Ubuntu 14.04 until you have the time to solve all the issues you will have in 16.04:

dist: trusty

Error details

Here are few indicators that you ran into this issue:

Connection to the PostgreSQL database does not work anymore

Your travis-ci builds might have started failing on the usual

psql -c 'create database active_type_test;' -U postgres

with an error

psql: could not connect to server: No such file or directory
	Is the server running locally and accepting
	connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

Connection to the MySQL database does not work anymore

Your travis-ci builds might have started failing on the usual

mysql -e 'create database IF NOT EXISTS minidusen_test;'

with an error

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
The command "mysql -e 'create database IF NOT EXISTS minidusen_test;'" failed and exited with 1 during .

Rails 2/3 migrations don't work anymore

bundle exec rspec spec
-- create_table(:users)
bundler: failed to load command: rspec (/home/travis/build/makandra/minidusen/vendor/bundle/ruby/2.2.0/bin/rspec)
ActiveRecord::StatementInvalid: Mysql2::Error: All parts of a PRIMARY KEY must be NOT NULL; if you need NULL in a key, use UNIQUE instead: CREATE TABLE `users` (`id` int(11) DEFAULT NULL auto_increment PRIMARY KEY, `name` varchar(255), `email` varchar(255), `city` varchar(255)) ENGINE=InnoDB