Add posts test

test/system/posts_test.rb

@@ -0,0 +1,43 @@
+require "application_system_test_case"
+
+class PostsTest < ApplicationSystemTestCase
+  setup do
+    @post = posts(:one)
+  end
+
+  test "visiting the index" do
+    visit posts_url
+    assert_selector "h1", text: "Posts"
+  end
+
+  test "should create post" do
+    visit posts_url
+    click_on "New post"
+
+    fill_in "Body", with: @post.body
+    fill_in "Title", with: @post.title
+    click_on "Create Post"
+
+    assert_text "Post was successfully created"
+    click_on "Back"
+  end
+
+  test "should update Post" do
+    visit post_url(@post)
+    click_on "Edit this post", match: :first
+
+    fill_in "Body", with: @post.body
+    fill_in "Title", with: @post.title
+    click_on "Update Post"
+
+    assert_text "Post was successfully updated"
+    click_on "Back"
+  end
+
+  test "should destroy Post" do
+    visit post_url(@post)
+    click_on "Destroy this post", match: :first
+
+    assert_text "Post was successfully destroyed"
+  end
+end