tests: fix tox min job

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

Author: henryiii

tox.ini

@@ -13,6 +13,8 @@ skip_missing_interpreters = true
 [testenv]
 description =
     run test suite with {basepython}
+deps =
+    pip
 extras =
     test
 pass_env =
@@ -71,9 +73,13 @@ commands_pre =
 
 [testenv:{py313, py312, py311, py310, py39, py38, pypy38, pypy39, pypy310}-min]
 description = check minimum versions required of all dependencies
-skip_install = true
-commands_pre =
-    pip install .[test] -c tests/constraints.txt
+set_env =
+    PIP_CONSTRAINT = {toxinidir}/tests/constraints.txt
+    UV_CONSTRAINT = {toxinidir}/tests/constraints.txt
+commands =
+    PIP_CONSTRAINT='' UV_CONSTRAINT='' pytest -ra --cov --cov-config pyproject.toml \
+      --cov-report=html:{envdir}/htmlcov --cov-context=test \
+      --cov-report=xml:{toxworkdir}/coverage.{envname}.xml {posargs:-n auto}
 
 [testenv:dev]
 description = generate a DEV environment