test if there is a cap on the qiskit depdency

ecosystem/validation/test_pypi.py

@@ -12,7 +12,7 @@
 
 """Validations involving section member.pypi"""
 
-# pylint: disable=invalid-name
+# pylint: disable=invalid-name,missing-function-docstring
 
 import pytest
 
@@ -75,3 +75,11 @@ def test_P11(member):
     assert (
         len(stable_packages) != 0
     ), "At least one python package should declare a stable development status classifier"
+
+
+def test_P12(member):
+    for pypi_package in member.pypi.values():
+        assert pypi_package.compatible_with_qiskit(3), (
+            f"Python package {pypi_package.package_name} declared "
+            "itself compatible with a not-yet-released major version of Qiskit"
+        )

resources/checks.toml

@@ -242,6 +242,15 @@ description = "If the project maturiy level is is production-ready then, at leas
 checker = "test_pypi.py::test_P11"
 importance = "STRONG-RECOMMENDATION"
 
+[P12]
+title = "Have a cap on the major version for the qiskit dependency"
+applies_to = "Python packages"
+affects = ['member.pypi.*.requires_qiskit']
+category = "BEST-PRACTICE"
+description = "As Qiskit follows semantic versioning, not having a cap for the eventual next major version, there is no guarantee that the package will continue working as expected."
+checker = "test_pypi.py::test_P12"
+importance = "RECOMMENDATION"
+
 [020]
 title = "Primitive interface should be v2-compatible"
 applies_to = 'label:"Compute provider"'
@@ -302,3 +311,7 @@ description = "There is an issue with some of the open-source aspect of the proj
 [[categories]]
 name = "OUT-OF-DATE"
 description = "The project might not follow the last best-practices or connects to Qiskit in a way that is considered old-fashioned, currently unsupported, or deprecated."
+
+[[categories]]
+name = "BEST-PRACTICE"
+description = "The project might not follow software general best-practices."