refs #17 画像のバリデーションに関するテストを追加

spec/models/image_spec.rb

@@ -0,0 +1,34 @@
+require 'spec_helper'
+
+describe Image do
+  describe "Validation" do
+    let (:valid_image_url) { 'http://example.com/image.png' }
+    let (:invalid_image_path) { 'spec/files/invalid_aspect_image.png' }
+    let (:invalid_image_size) { ImageSize.new(open(invalid_image_path)) }
+    let (:invalid_image) { described_class.new(url: valid_image_url, width: invalid_image_size.width, height: invalid_image_size.height) }
+
+    it "高さが足りない場合" do
+      image = invalid_image
+      image.width = 17
+      image.height = 16
+      image.should be_invalid
+      image.errors[:height].should be_present
+    end
+
+    it "幅が足りない場合" do
+      image = invalid_image
+      image.width = 16
+      image.height = 17
+      image.should be_invalid
+      image.errors[:width].should be_present
+    end
+
+    it "アスペクト比が不正な場合" do
+      image = invalid_image
+      image.width *= 100
+      image.height *= 100
+      image.should be_invalid
+      image.errors[:base].should be_present
+    end
+  end
+end