From a7e6d17c8f30c463bc02ce10d587d2f1a275d7a8 Mon Sep 17 00:00:00 2001
From: Rany Keddo <rany@soundcloud.com>
Date: Mon, 16 Jan 2012 13:54:23 +0100
Subject: [PATCH] added intersection specs

---
 spec/unit/intersection_spec.rb | 42 ++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 spec/unit/intersection_spec.rb

diff --git a/spec/unit/intersection_spec.rb b/spec/unit/intersection_spec.rb
new file mode 100644
index 00000000..8aff3fb8
--- /dev/null
+++ b/spec/unit/intersection_spec.rb
@@ -0,0 +1,42 @@
+#
+#  Copyright (c) 2011, SoundCloud Ltd., Rany Keddo, Tobias Bielohlawek, Tobias
+#  Schmidt
+#
+
+require File.expand_path(File.dirname(__FILE__)) + '/unit_helper'
+
+require 'lhm/table'
+require 'lhm/migrator'
+
+describe Lhm::Intersection do
+  include UnitHelper
+
+  it "should not have dropped changes" do
+    origin = Lhm::Table.new("origin")
+    origin.columns["dropped"]  = varchar
+    origin.columns["retained"] = varchar
+
+    destination = Lhm::Table.new("destination")
+    destination.columns["retained"] = varchar
+
+    intersection = Lhm::Intersection.new(origin, destination)
+    intersection.common.include?("dropped").must_equal(false)
+  end
+
+  it "should have unchanged columns" do
+    origin = Lhm::Table.new("origin")
+    origin.columns["dropped"]  = varchar
+    origin.columns["retained"] = varchar
+
+    destination = Lhm::Table.new("destination")
+    destination.columns["retained"] = varchar
+
+    intersection = Lhm::Intersection.new(origin, destination)
+    intersection.common.must_equal(["retained"])
+  end
+
+  def varchar
+    { :metadata => "VARCHAR(255)"}
+  end
+end
+