Add integration tests for the migrator

spec/integration/migrator_test.rb

@@ -0,0 +1,33 @@
+require File.join(File.dirname(__FILE__), 'spec_helper.rb')
+
+Sequel.extension :migration
+describe Sequel::Migrator do
+  before do
+    @db = INTEGRATION_DB
+    @m = Sequel::Migrator
+    @dir = 'spec/files/integer_migrations'
+  end
+  after do
+    [:schema_info, :sm1111, :sm2222, :sm3333].each{|n| @db.drop_table(n) rescue nil}
+  end
+
+  specify "should be able to migrate up and down all the way successfully" do
+    @m.apply(@db, @dir)
+    [:schema_info, :sm1111, :sm2222, :sm3333].each{|n| @db.table_exists?(n).should be_true}
+    @db[:schema_info].get(:version).should == 3
+    @m.apply(@db, @dir, 0)
+    [:sm1111, :sm2222, :sm3333].each{|n| @db.table_exists?(n).should be_false}
+    @db[:schema_info].get(:version).should == 0
+  end
+
+  specify "should be able to migrate up and down to specific versions successfully" do
+    @m.apply(@db, @dir, 2)
+    [:schema_info, :sm1111, :sm2222].each{|n| @db.table_exists?(n).should be_true}
+    @db.table_exists?(:sm3333).should be_false
+    @db[:schema_info].get(:version).should == 2
+    @m.apply(@db, @dir, 1)
+    [:sm2222, :sm3333].each{|n| @db.table_exists?(n).should be_false}
+    @db.table_exists?(:sm1111).should be_true
+    @db[:schema_info].get(:version).should == 1
+  end
+end