Move docs to mkdocs and improve them

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

docs/contribute/tests.md

@@ -0,0 +1,64 @@
+# Tests
+
+## Backend
+
+The backend uses `ExUnit`.
+
+To launch all the tests:
+```bash
+mix test
+```
+
+!!! info
+    If you're using Docker, you can use `make test`
+
+If you want test coverage:
+
+```bash
+mix coveralls.html
+```
+
+It will show the coverage and will output a `cover/excoveralls.html` file.
+
+If you want to test a single file:
+
+```bash
+mix test test/mobilizon/actors/actors_test.exs
+```
+
+If you want to test a specific test, block or line:
+
+```bash
+mix test test/mobilizon/actors/actors_test.exs:85
+```
+
+!!! tip
+    Note: The `coveralls.html` also works the same
+
+## Front-end
+
+### Unit tests
+
+Not done yet.
+
+### End-to-end tests
+
+We use [Cypress](https://cypress.io) for End-to-end testing.
+
+You first need to run the webserver with the `e2e` environment: `MIX_ENV=e2e mix phx.server`. The same environment parameters as the `dev` environment must be provided.
+This allows to run database operations in the sandbox and not pollute your database.
+
+Then, run `MIX_ENV=e2e mix run priv/repo/e2e.seed.exs` to have some initial data inside your instance for the tests.
+
+When inside the `js` directory, you can do either
+```bash
+npx cypress run
+```
+to run the tests, or
+```bash
+npx cypress open
+```
+to open the interactive GUI.
+
+!!! info
+    Cypress provided [a subscription](https://www.cypress.io/oss-plan) to their recording dashboard since Mobilizon is an Open-Source project. Thanks!