添加article model测试及相关fixture数据

test/fixtures/articles.yml

@@ -0,0 +1,6 @@
+article1:
+    id: 1
+    title: "aaaaaaaaaaaa"
+    tags: "aaa"
+    content: "aaaaaaaaaaaaa"
+    

test/fixtures/categorys.yml

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+category1:
+    id: 1
+    name: "category" 
+category2:
+    id: 2
+    name: "category2"

test/models/articles_model_test.rb

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+require 'test_helper'
+
+class ArticleTest < ActiveSupport::TestCase
+    fixtures :articles
+
+    setup do
+        @article = Article.find(1)
+        @newarticle = Article.new
+    end
+
+    test "test_article_create" do
+        @newarticle.title = 'bbbbbbbbbbb'
+        @newarticle.tags = 'bbbb'
+        @newarticle.content = 'bbbbbbbbbbbbbbbb'
+        @newarticle.category_id = 1
+        assert @newarticle.save
+    end
+
+    test "test_article_read" do
+        assert_instance_of Article, @article 
+        assert_equal 1, @article.id, "test Article.id"
+        assert_equal "aaaaaaaaaaaa", @article.title, "test Article.title"
+        assert_equal "aaa", @article.tags, "test Article.tags"
+        assert_equal "aaaaaaaaaaaaa", @article.content, "test Article.content"
+    end
+
+    test "test_article_update" do
+        @article.category_id = 2
+        assert @article.save, @article.errors.full_messages.join("; ")
+        @article.reload
+        assert 2, @article.category_id
+    end
+
+    test "test_article_delete" do
+        @article.destroy
+        assert_raise(ActiveRecord::RecordNotFound) { Article.find(@article.id) }
+    end
+end