Introduce dependency test suite

The plan is to build out this test suite to test against
the AWS CLI's dependencies to help facilitate dependency upgrades.

To start, this test suite contains the following new test cases:

* Assert expected packages in runtime closure. This allows us to
  be alerted if a dependency introduces a new transitive depenency
  to the AWS CLI closure.

* Assert expected unbounded dependencies in runtime closure.

* Assert expected packages in build closure

* Assert expected unbounded dependencies in build closure

Implemenation notes:

* Why it is a separate test directory

* Note how to figure it out for runtime dependencies

* Note how to figure out for build dependencies

.github/workflows/run-dep-tests.yml

@@ -0,0 +1,27 @@
+name: Run dependency tests
+
+on:
+  push:
+  pull_request:
+    branches-ignore: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        os: [ubuntu-latest, macOS-latest, windows-latest]
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: python scripts/ci/install
+    - name: Run tests
+      run: python scripts/ci/run-dep-tests

requirements-dev-lock.txt

@@ -7,6 +7,10 @@
 atomicwrites==1.4.1 \
     --hash=sha256:81b2c9071a49367a7f770170e5eec8cb66567cfbbc8c73d20ce5ca4a8d71cf11
     # via -r requirements-dev.txt
+build==1.0.3 \
+    --hash=sha256:538aab1b64f9828977f84bc63ae570b060a8ed1be419e7870b8b4fc5e6ea553b \
+    --hash=sha256:589bf99a67df7c9cf07ec0ac0e5e2ea5d4b37ac63301c4986d1acb126aa83f8f
+    # via -r requirements-dev.txt
 colorama==0.4.4 \
     --hash=sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b \
     --hash=sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2
@@ -79,22 +83,29 @@ exceptiongroup==1.1.3 \
     --hash=sha256:097acd85d473d75af5bb98e41b61ff7fe35efe6675e4f9370ec6ec5126d160e9 \
     --hash=sha256:343280667a4585d195ca1cf9cef84a4e178c4b6cf2274caef9859782b567d5e3
     # via pytest
+importlib-metadata==7.0.1 \
+    --hash=sha256:4805911c3a4ec7c3966410053e9ec6a1fecd629117df5adee56dfc9432a1081e \
+    --hash=sha256:f238736bb06590ae52ac1fab06a3a9ef1d8dce2b7a35b5ab329371d6c8f5d2cc
+    # via build
 iniconfig==1.1.1 \
     --hash=sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3 \
     --hash=sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32
     # via pytest
-packaging==21.3 \
-    --hash=sha256:dd47c42927d89ab911e606518907cc2d3a1f38bbd026385970643f9c5b8ecfeb \
-    --hash=sha256:ef103e05f519cdc783ae24ea4e2e0f508a9c99b2d4969652eed6a2e1ea5bd522
-    # via pytest
+packaging==23.2 \
+    --hash=sha256:048fb0e9405036518eaaf48a55953c750c11e1a1b68e0dd1a9d62ed0c092cfc5 \
+    --hash=sha256:8c491190033a9af7e1d931d0b5dacc2ef47509b34dd0de67ed209b5203fc88c7
+    # via
+    #   -r requirements-dev.txt
+    #   build
+    #   pytest
 pluggy==1.0.0 \
     --hash=sha256:4224373bacce55f955a878bf9cfa763c1e360858e330072059e10bad68531159 \
     --hash=sha256:74134bbf457f031a36d68416e1509f34bd5ccc019f0bcc952c7b909d06b37bd3
     # via pytest
-pyparsing==3.0.9 \
-    --hash=sha256:2b020ecf7d21b687f219b71ecad3631f644a47f01403fa1d1036b0c6416d70fb \
-    --hash=sha256:5026bae9a10eeaefb61dab2f09052b9f4307d44aee4eda64b309723d8d206bbc
-    # via packaging
+pyproject-hooks==1.0.0 \
+    --hash=sha256:283c11acd6b928d2f6a7c73fa0d01cb2bdc5f07c57a2eeb6e83d5e56b97976f8 \
+    --hash=sha256:f271b298b97f5955d53fb12b72c1fb1948c22c1a6b70b315c54cedaca0264ef5
+    # via build
 pytest==7.4.0 \
     --hash=sha256:78bf16451a2eb8c7a2ea98e32dc119fd2aa758f1d5d66dbf0a59d69a3969df32 \
     --hash=sha256:b4bf8c45bd59934ed84001ad51e11b4ee40d40a1229d2c79f9c592b0a3f6bd8a
@@ -109,9 +120,15 @@ tomli==2.0.1 \
     --hash=sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc \
     --hash=sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f
     # via
+    #   build
     #   coverage
+    #   pyproject-hooks
     #   pytest
 wheel==0.38.1 \
     --hash=sha256:7a95f9a8dc0924ef318bd55b616112c70903192f524d120acc614f59547a9e1f \
     --hash=sha256:ea041edf63f4ccba53ad6e035427997b3bb10ee88a4cd014ae82aeb9eea77bb9
     # via -r requirements-dev.txt
+zipp==3.17.0 \
+    --hash=sha256:0e923e726174922dce09c53c59ad483ff7bbb8e572e00c7f7c46b88556409f31 \
+    --hash=sha256:84e64a1c28cf7e91ed2078bb8cc8c259cb19b76942096c8d7b84947690cabaf0
+    # via importlib-metadata

requirements-dev.txt

@@ -7,3 +7,7 @@ pytest==7.4.0
 pytest-cov==4.1.0
 atomicwrites>=1.0 # Windows requirement
 colorama>0.3.0 # Windows requirement
+
+# Dependency test specific deps
+packaging==23.2
+build==1.0.3

scripts/ci/run-dep-tests

@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+# Don't run tests from the root repo dir.
+# We want to ensure we're importing from the installed
+# binary package not from the CWD.
+
+import os
+from contextlib import contextmanager
+from subprocess import check_call
+
+_dname = os.path.dirname
+
+REPO_ROOT = _dname(_dname(_dname(os.path.abspath(__file__))))
+
+
+@contextmanager
+def cd(path):
+    """Change directory while inside context manager."""
+    cwd = os.getcwd()
+    try:
+        os.chdir(path)
+        yield
+    finally:
+        os.chdir(cwd)
+
+
+def run(command):
+    env = os.environ.copy()
+    env['TESTS_REMOVE_REPO_ROOT_FROM_PATH'] = 'true'
+    return check_call(command, shell=True, env=env)
+
+
+if __name__ == "__main__":
+    with cd(os.path.join(REPO_ROOT, "tests")):
+        run(f"{REPO_ROOT}/scripts/ci/run-tests dependencies")

tests/dependencies/__init__.py

@@ -0,0 +1,12 @@
+# Copyright 2024 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"). You
+# may not use this file except in compliance with the License. A copy of
+# the License is located at
+#
+#     http://aws.amazon.com/apache2.0/
+#
+# or in the "license" file accompanying this file. This file is
+# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
+# ANY KIND, either express or implied. See the License for the specific
+# language governing permissions and limitations under the License.