Similarly to 65250022, this allows to use routes helpers for mounted
helpers, but this time in ActionView::TestCase

This seems to be required only when calling render :partial with an
empty collection from a controller. This call happens to return no
content, letting the response body empty, which means to Rails that it
should go on and try to find a template to render based on the current
action name, thus failing hard.

Although tests keep all green, we need to check a better way to fix
this.

Reuse the view_context from the controller, this make the test environment more similar to the code applications uses

- also add tests
- also deprecate _assigns

[#5751 state:resolved]
Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

_assigns must return a hash.

This reverts commit e66c1cee.

Avoid (@_var ||= nil) pattern by using initialize methods and ensuring everyone calls super as expected.

Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

- was exposed as _view, which suggested it was private
- left _view as an alias of view as not to break any extensions that are
  relying on _view

[#4932 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

rendering the view.

- Previously, _assigns were locked down the first time _view was
  referenced.

[#4931 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

[#4930 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

partials are rendered under different conditions.

[#4903 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

[#4799 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

_helper module included in the view.

- ensures that protect_against_forgery? is present when a helper
  included in a partial that is rendered by the template under test
  calls it (which happens in FormTagHelper#extra_tags_for_form, for
  example).

[#4700 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

_helper module included in the view.

- ensures that protect_against_forgery? is present when a helper
  included in a partial that is rendered by the template under test
  calls it (which happens in FormTagHelper#extra_tags_for_form, for
  example).

[#4700 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>