Add Django 3.2 to CI test matrix and remove 3.0

[justinmayer]

This PR contains a few minor CI-related changes:

• Add Django 3.2 to CI test matrix
• Remove the now-unsupported Django 3.0 from the CI test matrix
• Specify Django version numbers in a slightly more-readable fashion and install them via the "compatible release" specifier
• Upgrade to "cache" v2 GitHub action

[justinmayer]

How fun… The form validation failure error message changed between Django 2.2 and 3.1, so updating it for 3.1+ obviously causes the test to fail for Django 2.2. Anyone have suggestions regarding how to make that test compatible with multiple Django versions?

[smithdc1]

What do you think about something like this?

diff --git a/tests/test_helper.py b/tests/test_helper.py
index b141bb1..addd9ca 100644
--- a/tests/test_helper.py
+++ b/tests/test_helper.py
@@ -1,3 +1,4 @@
+import django
 from django.forms.models import formset_factory
 from django.template import Template
 from django.test import SimpleTestCase
@@ -303,6 +304,8 @@ class CrispyHelperTests(SimpleTestCase):
         formset.helper.formset_error_title = "Non Form Errors"
         formset.helper.form_tag = False
         formset.helper.layout = Layout("email")
+        if django.VERSION < (3, 2):
+            formset.non_form_errors = ["Please submit at most 2 forms."]
         html = render_crispy_form(formset)
         expected_html = """
             <div>
@@ -315,7 +318,7 @@ class CrispyHelperTests(SimpleTestCase):
                 </div>
                 <div class="border border-red-400 rounded-b bg-red-100 px-4 py-3 text-red-700">
                     <ul>
-                        <li>Please submit 2 or fewer forms.</li>
+                        <li>Please submit at most 2 forms.</li>
                     </ul>
                 </div>
             </div>
~

[justinmayer]

@smithdc1: Good suggestion. Thanks for that. I changed the test code here accordingly, and everything looks to be in good shape now, with all tests passing. Would you mind having another look and then merging if everything seems to be in order?

[justinmayer]

Agreed — I think iterative improvement are always best. 💫

[smithdc1]

I just remembered we need to update the classifiers in setup.py as well.

Sorry.

[codecov-io]

Codecov Report

Merging #91 (2791007) into main (5ea1042) will increase coverage by 0.31%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
+ Coverage   70.80%   71.11%   +0.31%     
==========================================
  Files          37       37              
  Lines         637      637              
  Branches       28       28              
==========================================
+ Hits          451      453       +2     
+ Misses        176      174       -2     
  Partials       10       10              

Impacted Files	Coverage Δ
crispy_tailwind/templatetags/tailwind_field.py	48.62% <0.00%> (+1.83%)	:arrow_up:

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