Hi
I get a failure in assertInHTML with the following error:
AssertionError: False is not true : Couldn't find 'Bonjour Mr Freeze, c'est foo bar!<br>' in response
although the response contains:
Bonjour Mr Freeze, c'est foo bar!
In both cases, I am using the translation feature to build the message. In the template, I’m using
{% blocktranslate %}Hello {{invited}}, this is {{admin}}!{% endblocktranslate %}
and in the test, I’m using
self.assertInHTML(f'''{_("Hello %(invited)s, this is %(admin)s!")% {'invited': test_invite['invited'], 'admin' : sender.get_full_name()}}<br/>''', content)
It looks like the simple quote is translated to ’ in the response and to ' in the test but anyway, from HTML point of view, this is the same and it should not fail.
Actually, this is not linked to the simple quote, I tried it in English and had the same error.
Finally, this is the way assertInHTML works: you cannot provide a simple string as needle, it won’t find it!
I had to add the the HTML element around the string and as there were many children to this HTML element, I had to tests them all at once 
It would be great if assertInHTML can check only a string…
That’s actually what assertContains does.
Thank you @KenWhitesell
I usually use assertContains instead of assertInHTML already but except if I missed something, I can’t use assertContains in my case because I am checking the HTML content of an email I generated, not an HTTP response.
Furthermore, I’m not sure at all assertContains behaves differently than assertInHTML with strings anyway: in case you need to check strings with HTML entities (like me with ' ) I think you need to pass html=True and then you are using the same behavior as the assertInHTML one…
In that case, I’d probably use assertIn.
I’d either define the string-to-be-tested to have the html entities in it, or run that string through a function that converts the reserved characters to their entity equivalents.