"bundle exec rake test" is pending

When I run 'bundle exec rake test' under my application, It's pending forever. And then I entered 'Ctrl + C' to stop it. Then it gives these message:

^C/home/ishamo/.rvm/gems/ruby-2.2.1/gems/spring-1.1.3/lib/spring/client/run.rb:54:in `gets': Interrupt
    from /home/ishamo/.rvm/gems/ruby-2.2.1/gems/spring-1.1.3/lib/spring/client/run.rb:54:in `verify_server_version'
    from /home/ishamo/.rvm/gems/ruby-2.2.1/gems/spring-1.1.3/lib/spring/client/run.rb:25:in `call'
    from /home/ishamo/.rvm/gems/ruby-2.2.1/gems/spring-1.1.3/lib/spring/client/command.rb:7:in `call'
    from /home/ishamo/.rvm/gems/ruby-2.2.1/gems/spring-1.1.3/lib/spring/client.rb:26:in `run'
    from /home/ishamo/.rvm/gems/ruby-2.2.1/gems/spring-1.1.3/bin/spring:48:in `<top (required)>'
    from /home/ishamo/.rvm/gems/ruby-2.2.1/gems/spring-1.1.3/lib/spring/binstub.rb:11:in `load'
    from /home/ishamo/.rvm/gems/ruby-2.2.1/gems/spring-1.1.3/lib/spring/binstub.rb:11:in `<top (required)>'
    from /home/ishamo/ra/sample_app/bin/spring:13:in `require'
    from /home/ishamo/ra/sample_app/bin/spring:13:in `<top (required)>'
    from bin/rake:3:in `load'
    from bin/rake:3:in `<main>'

rake aborted! Interrupt: /home/ishamo/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5/lib/active_record/migration.rb:401:in system' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5/lib/active_record/migration.rb:401:inblock in load_schema_if_pending!' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5/lib/active_record/migration.rb:398:in load_schema_if_pending!' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5/lib/active_record/migration.rb:411:inblock in maintain_test_schema!' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5/lib/active_record/migration.rb:642:in suppress_messages' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5/lib/active_record/migration.rb:416:inmethod_missing' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5/lib/active_record/migration.rb:411:in maintain_test_schema!' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5/lib/rails/test_help.rb:19:in' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:274:in require' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:274:inblock in require' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:240:in load_dependency' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:274:inrequire' /home/ishamo/ra/sample_app/test/test_helper.rb:3:in <top (required)>' /home/ishamo/ra/sample_app/test/controllers/static_pages_controller_test.rb:1:inrequire' /home/ishamo/ra/sample_app/test/controllers/static_pages_controller_test.rb:1:in <top (required)>' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:114:inrequire' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:114:in block (3 levels) in define' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:114:ineach' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:114:in block (2 levels) in define' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:113:ineach' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:113:in block in define' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5/lib/rails/test_unit/sub_test_task.rb:20:ininvoke_rake_task' /home/ishamo/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5/lib/rails/test_unit/testing.rake:8:in block in <top (required)>' /home/ishamo/.rvm/gems/ruby-2.2.1/bin/ruby_executable_hooks:15:ineval' /home/ishamo/.rvm/gems/ruby-2.2.1/bin/ruby_executable_hooks:15:in `' Tasks: TOP => test:run (See full trace by running task with --trace)

I am a beginner. Would you please tell me how to do it? Appreciate.