chore: validate release

Author: imabhichow

tox.ini

@@ -399,7 +399,7 @@ commands =
     twine upload --skip-existing --repository pypi {toxinidir}/dist/*
 
 # Test the PyPI released version (not local source code)
-[testenv:py-validate]
+[testenv:py-validate-base]
 basepython = python3
 skip_install = true
 passenv = {[testenv]passenv}
@@ -410,29 +410,31 @@ deps =
     coverage
     # Add dev requirements for testing
     -rdev_requirements/test-requirements.txt
-commands =
-    # First, install the specified version from PyPI
-    pip install "aws-encryption-sdk[MPL]=={posargs:latest}" --force-reinstall
-    # Install MPL requirements if running MPL examples
-    mplexamples: pip install -r requirements_mpl.txt
-    # Run non-MPL examples
-    examples: {[testenv:base-command]commands} examples/test/legacy/ -m examples
-    # Run MPL-specific examples 
-    mplexamples: {[testenv:base-command]commands} examples/test/ -m examples --ignore examples/test/legacy/
 
-# Shortcuts for validating specific versions
+# Standard test environment for PyPI-released version (no MPL)
 [testenv:validate-pypi-release]
-basepython = {[testenv:py-validate]basepython}
-skip_install = {[testenv:py-validate]skip_install}
-passenv = {[testenv:py-validate]passenv}
-deps = {[testenv:py-validate]deps}
-factors = examples
-commands = {[testenv:py-validate]commands}
+basepython = {[testenv:py-validate-base]basepython}
+skip_install = {[testenv:py-validate-base]skip_install}
+passenv = {[testenv:py-validate-base]passenv}
+deps = {[testenv:py-validate-base]deps}
+commands =
+    # Install the specified version from PyPI (without MPL extras)
+    pip install "aws-encryption-sdk=={posargs:latest}" --force-reinstall
+    # Run non-MPL examples
+    {[testenv:base-command]commands} examples/test/legacy/ -m examples
 
+# MPL test environment for PyPI-released version
 [testenv:validate-pypi-release-mpl]
-basepython = {[testenv:py-validate]basepython}
-skip_install = {[testenv:py-validate]skip_install}
-passenv = {[testenv:py-validate]passenv}
-deps = {[testenv:py-validate]deps}
-factors = mplexamples
-commands = {[testenv:py-validate]commands}
+basepython = {[testenv:py-validate-base]basepython}
+skip_install = {[testenv:py-validate-base]skip_install}
+passenv = {[testenv:py-validate-base]passenv}
+deps = 
+    {[testenv:py-validate-base]deps}
+    boto3
+commands =
+    # Install the specified version from PyPI with MPL extras
+    pip install "aws-encryption-sdk[MPL]=={posargs:latest}" --force-reinstall
+    # Install MPL requirements needed for MPL examples
+    pip install -r requirements_mpl.txt
+    # Run MPL-specific examples
+    {[testenv:base-command]commands} examples/test/ -m examples --ignore examples/test/legacy/