[tests] Add tests for skip/enable-plugins merge from config and cmdline

tests/report_tests/plugin_tests/config_cmdline/config_cmdline_enabled_tests_sos.conf

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+[report]
+enable-plugins = networking

tests/report_tests/plugin_tests/config_cmdline/config_cmdline_only_tests_sos.conf

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+[report]
+only-plugins = host

tests/report_tests/plugin_tests/config_cmdline/config_cmdline_skipped_tests_sos.conf

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+[report]
+skip-plugins = host

tests/report_tests/plugin_tests/config_cmdline/config_cmdline_tests.py

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+# Copyright (C) 2026 Red Hat, Inc., Jose Castillo <jcastillo@redhat.com>
+
+# This file is part of the sos project: https://github.com/sosreport/sos
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions of
+# version 2 of the GNU General Public License.
+#
+# See the LICENSE file in the source distribution for further information.
+
+from sos_tests import StageTwoReportTest
+
+
+class SkippedPluginConfigCmdlineTest(StageTwoReportTest):
+    """Ensure that we handle skipped plugins specified
+    in sos.conf and merge them with cmdline properly
+
+    :avocado: tags=stagetwo
+    """
+
+    files = [('config_cmdline_skipped_tests_sos.conf', '/etc/sos/sos.conf')]
+    sos_cmd = '-n kernel'
+
+    def test_skip_plugins_merged_from_conf_and_cmdline(self):
+        # Plugin host is deactivated via sos.conf file
+        # Plugin kernel is deactivated via cmdline
+        options = r'--skip-plugins (host,kernel|kernel,host)'
+        self.assertSosLogContains(f"effective options now: .*{options}")
+        self.assertPluginNotIncluded('host')
+        self.assertPluginNotIncluded('kernel')
+
+
+class EnabledPluginConfigCmdlineTest(StageTwoReportTest):
+    """Ensure that we handle enabled plugins specified in sos.conf
+    and merge them with cmdline properly
+
+    :avocado: tags=stagetwo
+    """
+
+    files = [('config_cmdline_enabled_tests_sos.conf', '/etc/sos/sos.conf')]
+    sos_cmd = '-e memory'
+
+    def test_enabled_plugins_merged_from_conf_and_cmdline(self):
+        # Plugin networking is enabled via sos.conf file
+        # Plugin memory is enabled via cmdline
+        options = r'--enable-plugins (networking,memory|memory,networking)'
+        self.assertSosLogContains(f"effective options now: .*{options}")
+        self.assertPluginIncluded('networking')
+        self.assertPluginIncluded('memory')
+
+
+class PreferPluginPresetConfigTest(StageTwoReportTest):
+    """Test that the preset takes precedence over config file
+
+    :avocado: tags=stagetwo
+    """
+
+    files = [('config_preset_precedence_tests_sos.conf', '/etc/sos/sos.conf'),
+             ('config_preset_precedence_tests.json',
+              '/etc/sos/presets.d/plugins_preset')]
+    sos_cmd = '--preset plugins_preset'
+
+    def test_precedence_preset_config(self):
+        # Plugin memory is enabled via sos.conf file
+        # Plugin memory is skipped via preset file
+        options = r'--skip-plugins memory'
+        self.assertSosLogContains(f"effective options now: .*{options}")
+        self.assertPluginNotIncluded('memory')
+
+
+class OnlyPluginConfigCmdlineTest(StageTwoReportTest):
+    """Test that only-plugins from cmdline replaces rather than merges
+    config value
+
+    Unlike skip-plugins and enable-plugins, which merge, only-plugins uses
+    replacement since it defines an exclusive set.
+
+    :avocado: tags=stagetwo
+    """
+
+    files = [('config_cmdline_only_tests_sos.conf', '/etc/sos/sos.conf')]
+    sos_cmd = '-o kernel'
+
+    def test_only_plugins_cmdline_replaces_config(self):
+        # Plugin host is enabled (only) via sos.conf file
+        # Plugin kernel is specified via cmdline
+        options = r'--only-plugins kernel'
+        self.assertSosLogContains(f"effective options now: .*{options}")
+        self.assertPluginIncluded('kernel')
+        self.assertPluginNotIncluded('host')

tests/report_tests/plugin_tests/config_cmdline/config_preset_precedence_tests.json

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+{
+    "plugins_preset": {
+        "desc": "test preset for plugin skipping",
+        "args": {
+            "skip_plugins": [
+                "memory"
+            ]
+        }
+    }
+}

tests/report_tests/plugin_tests/config_cmdline/config_preset_precedence_tests_sos.conf

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+[report]
+enable-plugins = memory