Tests for optional filelists metadata

Basic tests for optional filelists metadata functionality taken and reworked from the existing dnf5 tests.

dnf-behave-tests/dnf/optional-metadata.feature

@@ -0,0 +1,89 @@
+Feature: Tests for optional metadata loading functionality
+
+
+Background:
+  Given I use repository "dnf-ci-fedora"
+    And I successfully execute dnf with args "makecache --setopt=optional_metadata_types=,"
+    And I execute "find | sort" in "{context.dnf.installroot}/var/cache/dnf"
+   Then stdout matches line by line
+    """
+    \.
+    \./dnf-ci-fedora-[0-9a-f]{16}
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/primary\.xml\.*
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/repomd\.xml
+    \./dnf-ci-fedora\.solv
+    \./expired_repos\.json
+    """
+
+
+Scenario: Optional metadata are loaded when explicitly requested by the option
+  Given I successfully execute dnf with args "makecache --setopt=optional_metadata_types=,filelists"
+   When I execute "find | sort" in "{context.dnf.installroot}/var/cache/dnf"
+   Then stdout matches line by line
+    """
+    \.
+    \./dnf-ci-fedora-[0-9a-f]{16}
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/filelists\.xml\.zst
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/primary\.xml\.*
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/repomd\.xml
+    \./dnf-ci-fedora-filenames\.solvx
+    \./dnf-ci-fedora\.solv
+    \./expired_repos\.json
+    """
+
+
+Scenario: Invalid metadata type is ignored when processing the option
+  Given I successfully execute dnf with args "makecache --setopt=optional_metadata_types=,abcdef"
+   When I execute "find | sort" in "{context.dnf.installroot}/var/cache/dnf"
+   Then stdout matches line by line
+    """
+    \.
+    \./dnf-ci-fedora-[0-9a-f]{16}
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/primary\.xml\.*
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/repomd\.xml
+    \./dnf-ci-fedora\.solv
+    \./expired_repos\.json
+    """
+
+
+Scenario: Optional metadata are loaded when requested by command
+  Given I successfully execute dnf with args "provides basesystem --setopt=optional_metadata_types=,"
+   When I execute "find | sort" in "{context.dnf.installroot}/var/cache/dnf"
+   Then stdout matches line by line
+    """
+    \.
+    \./dnf-ci-fedora-[0-9a-f]{16}
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/filelists\.xml\.zst
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/primary\.xml\.*
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/repomd\.xml
+    \./dnf-ci-fedora-filenames\.solvx
+    \./dnf-ci-fedora\.solv
+    \./expired_repos\.json
+    """
+
+
+Scenario: Operation returns an error when metadata are not present in cacheonly mode
+  Given I execute dnf with args "provides basesystem --cacheonly --setopt=optional_metadata_types=,"
+   Then the exit code is 1
+    And stderr contains "Error: Cache-only enabled but no cache for 'dnf-ci-fedora'"
+
+
+Scenario: Filelists metadata are loaded when filepath spec is provided
+  Given I successfully execute dnf with args "repoquery /some/file --setopt=optional_metadata_types=,"
+   When I execute "find | sort" in "{context.dnf.installroot}/var/cache/dnf"
+   Then stdout matches line by line
+    """
+    \.
+    \./dnf-ci-fedora-[0-9a-f]{16}
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/filelists\.xml\.zst
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/primary\.xml\.*
+    \./dnf-ci-fedora-[0-9a-f]{16}/repodata/repomd\.xml
+    \./dnf-ci-fedora-filenames\.solvx
+    \./dnf-ci-fedora\.solv
+    \./expired_repos\.json
+    """