Add a bcond to allow building without tests

Always run at least an import check.

python-zope-exceptions.spec

@@ -18,6 +18,10 @@ general purpose that they don't belong in Zope application-specific packages.
 Summary:    Zope Exceptions
 BuildRequires:  python3-devel
 
+# There is a test dependency loop, so we need a way to build this without tests
+# zope.exceptions -> zope.testrunner-> zope.exceptions
+%bcond tests 1
+
 %description -n python3-zope-exceptions
 This package contains exception interfaces and implementations which are so
 general purpose that they don't belong in Zope application-specific packages.
@@ -26,7 +30,7 @@ general purpose that they don't belong in Zope application-specific packages.
 %autosetup -n %{modname}-%{version}
 
 %generate_buildrequires
-%pyproject_buildrequires -t
+%pyproject_buildrequires %{?with_tests:-t}
 
 %build
 %pyproject_wheel
@@ -36,7 +40,10 @@ general purpose that they don't belong in Zope application-specific packages.
 %pyproject_save_files zope
 
 %check
+%pyproject_check_import
+%if %{with tests}
 %tox
+%endif
 
 %files -n python3-zope-exceptions -f %{pyproject_files}
 %doc CHANGES.rst README.rst