Added some runner tests.

Signed-off-by: James McCarthy <james2mccarthy@gmail.com>

test/dummy/db/seeds/dependency.seeds.rb

@@ -0,0 +1 @@
+User.create(:email => 'user@example.com')

test/dummy/db/seeds/dependent.seeds.rb

@@ -0,0 +1,3 @@
+after :dependency do
+  Post.create(:title => 'title')
+end

test/seedbank/runner_test.rb

@@ -0,0 +1,25 @@
+require 'test_helper'
+
+describe Seedbank::Runner do
+
+  describe "seeds with dependency" do
+
+    subject { Rake::Task['db:seed:dependent'] }
+
+    before do
+      subject.reenable
+      Rake::Task['db:seed:dependent:body'].reenable if Rake::Task.task_defined?('db:seed:dependent:body')
+      Rake::Task['db:seed:dependency'].reenable
+    end
+
+    it "runs the dependent seed" do
+      Post.expects(:create).with(:title => 'title').returns(true)
+      subject.invoke
+    end
+
+    it "runs the dependency" do
+      User.expects(:create).with(:email => 'user@example.com').returns(true)
+      subject.invoke
+    end
+  end
+end