diff --git a/test/unit/settings/plan_test.rb b/test/unit/settings/plan_test.rb
new file mode 100644
index 0000000..349fa45
--- /dev/null
+++ b/test/unit/settings/plan_test.rb
@@ -0,0 +1,217 @@
+require 'test_helper'
+
+module Settings
+  class PlanTest < ActiveSupport::TestCase
+
+    setup do
+      @org = Org.last
+    
+      scaffold_plan
+    end
+
+    def settings(extras = {})
+      {margin:    (@margin || { top: 10, bottom: 10, left: 10, right: 10 }),
+       font_face: (@font_face || Settings::Template::VALID_FONT_FACES.first),
+       font_size: (@font_size || 11)
+      }.merge(extras)
+    end
+
+    def default_formatting
+      Settings::Template::DEFAULT_SETTINGS[:formatting]
+    end
+
+    # ---------------------------------------------------
+    test "settings should use defaults if none are defined" do
+      assert(!@plan.settings(:export).value?)
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "settings should use defined valid settings" do
+      @plan.settings(:export).formatting = settings
+      @plan.save!
+
+      assert(@plan.settings(:export).value?)
+      assert_equal(settings, @plan.settings(:export).formatting)
+      assert_not_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "setting negative margin should not be valid" do
+      @margin = { top: -10, bottom: 10, left: 10, right: 10 }
+
+      @plan.settings(:export).formatting = settings
+
+      assert(!@plan.valid?)
+      assert(!@plan.save)
+
+      assert_equal(I18n.t('helpers.settings.plans.errors.negative_margin'),
+                   @plan.errors.messages[:'setting_objects.formatting'].first)
+
+      @plan.reload
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "setting unknown margin should not be valid" do
+      @margin =  { top: 10, bottom: 10, left: 10, right: 10, top_left: 10 }
+
+      @plan.settings(:export).formatting = settings
+
+      assert(!@plan.valid?)
+      assert(!@plan.save)
+
+      assert_equal(I18n.t('helpers.settings.plans.errors.unknown_margin'),
+                   @plan.errors.messages[:'setting_objects.formatting'].first)
+
+      @plan.reload
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "setting negative font-size should not be valid" do
+      @font_size = -11
+
+      @plan.settings(:export).formatting = settings
+
+      assert(!@plan.valid?)
+      assert(!@plan.save)
+
+      assert_equal(I18n.t('helpers.settings.plans.errors.invalid_font_size'),
+                   @plan.errors.messages[:'setting_objects.formatting'].first)
+
+      @plan.reload
+
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "setting unknown key should not be valid" do
+      @plan.settings(:export).formatting = settings(foo: :bar)
+
+      assert(!@plan.valid?)
+      assert(!@plan.save)
+
+      assert_equal(I18n.t('helpers.settings.plans.errors.unknown_key'),
+                   @plan.errors.messages[:'setting_objects.formatting'].first)
+
+      @plan.reload
+
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "not setting font_face should not be valid" do
+      @plan.settings(:export).formatting = settings.reject {|k,v| k == :font_face }
+
+      assert(!@plan.valid?)
+      assert(!@plan.save)
+
+      assert_equal(I18n.t('helpers.settings.plans.errors.missing_key'),
+                   @plan.errors.messages[:'setting_objects.formatting'].first)
+
+      @plan.reload
+
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "not setting font_size should not be valid" do
+      @plan.settings(:export).formatting = settings.reject {|k,v| k == :font_size }
+
+      assert(!@plan.valid?)
+      assert(!@plan.save)
+
+      assert_equal(I18n.t('helpers.settings.plans.errors.missing_key'),
+                   @plan.errors.messages[:'setting_objects.formatting'].first)
+
+      @plan.reload
+
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "not setting margin should not be valid" do
+      @plan.settings(:export).formatting = settings.reject {|k,v| k == :margin }
+
+      assert(!@plan.valid?)
+      assert(!@plan.save)
+
+      assert_equal(I18n.t('helpers.settings.plans.errors.missing_key'),
+                   @plan.errors.messages[:'setting_objects.formatting'].first)
+
+      @plan.reload
+
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "setting non-hash as margin should not be valid" do
+      @margin = :foo
+
+      @plan.settings(:export).formatting = settings
+
+      assert(!@plan.valid?)
+      assert(!@plan.save)
+
+      assert_equal(I18n.t('helpers.settings.plans.errors.invalid_margin'),
+                   @plan.errors.messages[:'setting_objects.formatting'].first)
+
+      @plan.reload
+
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "setting non-integer as font_size should not be valid" do
+      @font_size = "foo"
+
+      @plan.settings(:export).formatting = settings
+
+      assert(!@plan.valid?)
+      assert(!@plan.save)
+
+      assert_equal(I18n.t('helpers.settings.plans.errors.invalid_font_size'),
+                   @plan.errors.messages[:'setting_objects.formatting'].first)
+
+      @plan.reload
+
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "setting non-string as font_face should not be valid" do
+      @font_face = 1
+
+      @plan.settings(:export).formatting = settings
+
+      assert(!@plan.valid?)
+      assert(!@plan.save)
+
+      assert_equal(I18n.t('helpers.settings.plans.errors.invalid_font_face'),
+                   @plan.errors.messages[:'setting_objects.formatting'].first)
+
+      @plan.reload
+
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+
+    # ---------------------------------------------------
+    test "setting unknown string as font_face should not be valid" do
+      @font_face = 'Monaco, Monospace, Sans-Serif'
+
+      @plan.settings(:export).formatting = settings
+
+      assert(!@plan.valid?)
+      assert(!@plan.save)
+
+      assert_equal(I18n.t('helpers.settings.plans.errors.invalid_font_face'),
+                   @plan.errors.messages[:'setting_objects.formatting'].first)
+
+      @plan.reload
+
+      assert_equal(default_formatting, @plan.settings(:export).formatting)
+    end
+  
+  end
+end
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