# HtmlAssertion
[](https://travis-ci.com/btbinhtran/html_assertion)
[](https://hex.pm/packages/html_assertion)
[](https://coveralls.io/github/btbinhtran/html_assertion?branch=master)
HTMLAssertion adds assertions for testing rendered HTML using CSS selectors.
Use them in your Phoenix controller and integration tests.
## Installation
The package can be installed
by adding `html_assertion` to your list of dependencies in `mix.exs`:
```elixir
def deps do
[
{:html_assertion, "~> 0.1.4", only: :test}
]
end
```
### Usage in Phoenix Controller and Integration Test
Import the HTML assertion functions in `YourAppWeb.ConnCase`. Remember to replace all instances of `YourApp` with your app module name.
```elixir
defmodule YourAppWeb.ConnCase do
.
.
.
using do
quote do
# Import conveniences for testing with connections
use Phoenix.ConnTest
alias YourAppWeb.Router.Helpers, as: Routes
use HTMLAssertion
# The default endpoint for testing
@endpoint YourAppWeb.Endpoint
end
end
.
.
.
end
```
Assuming the `html_response(conn, 200)` returns:
```html
<!DOCTYPE html>
<html>
<head>
<title>PAGE TITLE</title>
</head>
<body>
<a href="/signup">Sign up</a>
<a href="/help">Help</a>
</body>
</html>
```
An example controller test:
```elixir
defmodule YourAppWeb.PageControllerTest do
use YourAppWeb.ConnCase, async: true
test "should get index", %{conn: conn} do
conn = conn
|> get(Routes.page_path(conn, :index))
html_response(conn, 200)
# Page title is "PAGE TITLE"
|> assert_select("title", "PAGE TITLE")
# Page title is "PAGE TITLE" and there is only one title element
|> assert_select("title", count: 1, text: "PAGE TITLE")
# Page title matches "PAGE" and there is only one title element
|> assert_select("title", count: 1, match: "PAGE")
# Page has one link with href value "/signup"
|> assert_select("a[href='/signup']", count: 1)
# Page has at least one link
|> assert_select("a", min: 1)
# Page has at most two links
|> assert_select("a", max: 2)
# Page contains no forms
|> refute_select("form")
end
end
```
Read the docs at [https://hexdocs.pm/html_assertion](https://hexdocs.pm/html_assertion/HTMLAssertion.html).
