install setuptools for test packages, use pip

* setuptools isn't included in ensurepip in Python 3.12
* Use pip install instead of invoking setup.py directly, due to
  setuptools discouraging it and allowing updates for the tests packages
  to use PEP517 compliant build system to done seamlessly. Also don't
  need to invoke pip install -r requirements.txt.
* editable_mode=compat is comparable to python setup.py develop. But
  setuptools doesn't guarantee the longevity of the feature. Removal of
  support for the legacy method would be a thing consider.

Signed-off-by: Alfred Wingate <parona@protonmail.com>

Author: parona-source

tests/test_cp.sh

@@ -23,7 +23,7 @@ test_new_env_activated () {
     mkvirtualenv "source" >/dev/null 2>&1
 	RC=$?
 	assertEquals "0" "$RC"
-    (cd tests/testpackage && python setup.py install) >/dev/null 2>&1
+    (cd tests/testpackage && pip install .) >/dev/null 2>&1
     cpvirtualenv "source" "destination" >/dev/null 2>&1
     rmvirtualenv "source" >/dev/null 2>&1
     testscript="$(which testscript.py)"

tests/test_project_templates.sh

@@ -4,7 +4,7 @@ test_dir=$(dirname $0)
 source "$test_dir/setup.sh"
 
 oneTimeSetUp() {
-    (cd "$test_dir/testtemplate" && rm -rf build && "$VIRTUAL_ENV/bin/python" setup.py install)
+    (cd "$test_dir/testtemplate" && rm -rf build && "$VIRTUAL_ENV/bin/python" -m pip install .)
     rm -rf "$WORKON_HOME"
     mkdir -p "$WORKON_HOME"
     rm -rf "$PROJECT_HOME"

tests/test_wipeenv.sh

@@ -20,7 +20,7 @@ tearDown() {
 
 test_wipeenv () {
     mkvirtualenv "wipetest" >/dev/null 2>&1
-    (cd tests/testpackage && python setup.py install) >/dev/null 2>&1
+    (cd tests/testpackage && pip install .) >/dev/null 2>&1
     before="$(pip freeze)"
     assertTrue "testpackage not installed" "pip freeze | grep testpackage"
     wipeenv >/dev/null 2>&1
@@ -52,7 +52,7 @@ test_wipeenv_pip_e () {
 
 test_wipeenv_develop () {
     mkvirtualenv "wipetest" >/dev/null 2>&1
-    (cd tests/testpackage && python setup.py develop) >/dev/null 2>&1
+    (cd tests/testpackage && pip install -e . --config-settings editable_mode=compat) >/dev/null 2>&1
     before="$(pip freeze)"
     assertTrue "testpackage not installed" "pip freeze | grep testpackage"
     wipeenv >/dev/null 2>&1

tests/testpackage/requirements.txt

@@ -0,0 +1 @@
+setuptools

tests/testtemplate/requirements.txt

@@ -0,0 +1 @@
+setuptools