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@@ -350,6 +350,10 @@
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       end
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     end
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+    def pending_migrations
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+      migration_classes.select { |m| m.version > current_version }
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+    end
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+
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     private
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       def migration_classes
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         migrations = migration_files.inject([]) do |migrations, migration_file|

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@@ -1,5 +1,7 @@
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 *2.0.0* (December 6th, 2007)
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+* The test task stops with a warning if you have pending migrations.  #10377 [Josh Knowles]
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+
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 * Add warning to documentation about using transactional fixtures when the code under test uses transactions itself. Closes #7548 [thijsv]
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 * Update Prototype to 1.6.0.1.  [sam]

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@@ -125,6 +125,19 @@
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     puts "Current version: #{ActiveRecord::Migrator.current_version}"
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   end
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+  desc "Raises an error if there are pending migrations"
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+  task :abort_if_pending_migrations => :environment do
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+    pending_migrations = ActiveRecord::Migrator.new(:up, 'db/migrate').pending_migrations
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+
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+    if pending_migrations.any?
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+      puts "You have #{pending_migrations.size} pending migrations:"
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+      pending_migrations.each do |pending_migration|
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+        puts '  %4d %s' % [pending_migration.version, pending_migration.name]
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+      end
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+      abort "Run `rake db:migrate` to update your database then try again."
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+    end
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+  end
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+
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   namespace :fixtures do
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     desc "Load fixtures into the current environment's database.  Load specific fixtures using FIXTURES=x,y"
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     task :load => :environment do
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@@ -290,7 +303,7 @@
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     end
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     desc 'Prepare the test database and load the schema'
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-    task :prepare => :environment do
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+    task :prepare => %w(environment db:abort_if_pending_migrations) do
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       if defined?(ActiveRecord::Base) && !ActiveRecord::Base.configurations.blank?
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         Rake::Task[{ :sql  => "db:test:clone_structure", :ruby => "db:test:clone" }[ActiveRecord::Base.schema_format]].invoke
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       end