Get the changes spec working again

spec/vestal_versions/changes_spec.rb

@@ -0,0 +1,134 @@
+require 'spec_helper'
+
+describe VestalVersions::Changes do
+  context "a version's changes" do
+    let(:user){ User.create(:name => 'Steve Richert') }
+    subject{ user.versions.last.changes }
+
+    before do
+      user.update_attribute(:last_name, 'Jobs')
+    end
+
+    it { should be_a(Hash) }
+    it { should_not be_empty }
+
+    it 'has string keys' do
+      subject.keys.each{ |key| key.should be_a(String) }
+    end
+
+    it 'has two-element array values' do
+      subject.values.each do |key|
+        key.should be_a(Array)
+        key.size.should == 2
+      end
+    end
+
+    it 'has unique-element values' do
+      subject.values.each{ |v| v.uniq.should == v }
+    end
+
+    it "equals the model's changes" do
+      user.first_name = 'Stephen'
+      model_changes = user.changes
+      user.save
+      changes = user.versions.last.changes
+
+      model_changes.should == changes
+    end
+  end
+
+  context 'a hash of changes' do
+    let(:changes){ {'first_name' => ['Steve', 'Stephen']} }
+    let(:other){ {'first_name' => ['Catie', 'Catherine']} }
+
+    it 'properly appends other changes' do
+      expected = {'first_name' => ['Steve', 'Catherine']}
+
+      changes.append_changes(other).should == expected
+
+      changes.append_changes!(other)
+      changes.should == expected
+    end
+
+    it 'properly prepends other changes' do
+      expected = {'first_name' => ['Catie', 'Stephen']}
+
+      changes.prepend_changes(other).should == expected
+
+      changes.prepend_changes!(other)
+      changes.should == expected
+    end
+
+    it 'is reversible' do
+      expected = {'first_name' => ['Stephen', 'Steve']}
+
+      changes.reverse_changes.should == expected
+
+      changes.reverse_changes!
+      changes.should == expected
+    end
+  end
+
+  context 'the changes between two versions' do
+    let(:name){ 'Steve Richert' }
+    let(:user){ User.create(:name => name) }          # 1
+    let(:version){ user.version }
+
+    before do
+      user.update_attribute(:last_name, 'Jobs')       # 2
+      user.update_attribute(:first_name, 'Stephen')   # 3
+      user.update_attribute(:last_name, 'Richert')    # 4
+      user.update_attribute(:name, name)              # 5
+    end
+
+    it 'is a hash' do
+      1.upto(version) do |i|
+        1.upto(version) do |j|
+          user.changes_between(i, j).should be_a(Hash)
+        end
+      end
+    end
+
+    it 'has string keys' do
+      1.upto(version) do |i|
+        1.upto(version) do |j|
+          user.changes_between(i, j).keys.each{ |key| key.should be_a(String) }
+        end
+      end
+    end
+
+    it 'has two-element arrays with unique values' do
+      1.upto(version) do |i|
+        1.upto(version) do |j|
+          user.changes_between(i, j).values.each do |value|
+            value.should be_a(Array)
+            value.size.should == 2
+            value.uniq.should == value
+          end
+        end
+      end
+    end
+
+    it 'is empty between identical versions' do
+      user.changes_between(1, version).should be_empty
+      user.changes_between(version, 1).should be_empty
+    end
+
+    it 'is should reverse with direction' do
+      1.upto(version) do |i|
+        i.upto(version) do |j|
+          up    = user.changes_between(i, j)
+          down  = user.changes_between(j, i)
+          up.should == down.reverse_changes
+        end
+      end
+    end
+
+    it 'is empty with invalid arguments' do
+      1.upto(version) do |i|
+        user.changes_between(i, nil).should be_blank
+        user.changes_between(nil, i).should be_blank
+      end
+    end
+  end
+end