[packages] Expand tests with PM-specific bits

src/modules/packages/tests/1.global

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+# SPDX-FileCopyrightText: no
+# SPDX-License-Identifier: CC0-1.0
+rootMountPoint: /tmp

src/modules/packages/tests/CMakeTests.txt

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+#   SPDX-FileCopyrightText: no
+#   SPDX-License-Identifier: CC0-1.0
+#
+# We have tests to load (some) of the package-managers specifically, to
+# test their configuration code and implementation. Those tests conventionally
+# live in Python files here in the tests/ directory. Add them.
+foreach(_pm pacman)
+    add_test(
+        NAME configure-packages-${_pm}
+        COMMAND env PYTHONPATH=.: python3 ${CMAKE_CURRENT_LIST_DIR}/test-pm-${_pm}.py
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+    )
+endforeach()

src/modules/packages/tests/test-pm-pacman.py

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+#   SPDX-FileCopyrightText: no
+#   SPDX-License-Identifier: CC0-1.0
+#
+# Calamares Boilerplate
+import libcalamares
+libcalamares.globalstorage = libcalamares.GlobalStorage(None)
+libcalamares.globalstorage.insert("testing", True)
+
+# Module prep-work
+from src.modules.packages import main
+
+# .. we don't have a job in this test, so fake one
+class Job(object):
+    def __init__(self):
+        self.configuration = libcalamares.utils.load_yaml("pm-pacman.yaml")
+libcalamares.job = Job()
+
+# Specific PM test
+p = main.PMPacman()
+assert p.pacman_num_retries == 0
+assert p.pacman_disable_timeout == False
+assert p.pacman_needed_only == False