I am writing an app where it is desirable to check if a view does not have some functionality - in particular because that functionality must be presented only to users
Take a look at the docs here:
http://apidock.com/rails/ActionController/Assertions/SelectorAssertions/assert_select
From the docs:
assert_select is an assertion that selects elements and makes one or more equality tests.
and from the equality tests sections:
The equality test may be one of the following:
true - Assertion is true if at least one element selected.
false - Assertion is true if no element selected.
String/Regexp - Assertion is true if the text value of at least one element matches the string or regular expression.
Integer - Assertion is true if exactly that number of elements are selected.
Range - Assertion is true if the number of selected elements fit the range.
If no equality test specified, the assertion is true if at least one element selected.
And a simple example:
# Page contains no forms
assert_select "form", false, "This page must contain no forms"