dwyl/learn-elixir

Testing Phoenix Controller rendering

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#186 opened on Oct 26, 2022

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Description

Hi there!

I have a basic controller "welcome" that does: render(conn, "index.html", profile: profile) There are some assigns to render

I want to write a test that demonstrates that the rendering is correct

if I do:

conn = get(conn, "/welcome")
assert html_response(conn, 200) =~"hi"

Since some template assigns are present in the template, my test says that a key is not present.

Using Plug.Conn.assign(conn, :profile, %{k: v}) is ineffective.

Does anyone know how to do this? The doc is void on this or didn't find where.

Contributor guide

Research direction
In Phoenix controller tests, use `Plug.Conn.assign/3` on the connection before calling the action. For example: `conn = get(build conn() |> assign(:profile, %{key: "value"}), "/welcome")`. Alternatively, set assigns in the test helper using `conn` and `assign`. Then assert on `html response`.
Tech stack
elixir
Domain
backend
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
ElixirPhoenixExUnit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70