python-rtslib-fb: add some basic tests

These are a massive help for keeping things stable on the
mid-to-longterm when updating packages.
We might even feel comfortable partially automating the process.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/python/python-rtslib-fb/test.sh

@@ -0,0 +1,65 @@
+#!/bin/sh
+
+[ "$1" = "python3-rtslib-fb" ] || exit 0
+
+python3 - << EOF
+import sys
+
+# Verify key classes and exceptions are importable
+from rtslib_fb import (
+    RTSLibError,
+    RTSLibNotInCFSError,
+    FabricModule,
+    RTSRoot,
+    Target,
+    TPG,
+    LUN,
+    NetworkPortal,
+    NodeACL,
+    BlockStorageObject,
+    FileIOStorageObject,
+    RDMCPStorageObject,
+)
+
+# Test pure utility functions (no kernel/configfs required)
+from rtslib_fb.utils import colonize, generate_wwn, normalize_wwn
+
+# colonize: inserts colons every 2 hex characters
+assert colonize("aabbccdd") == "aa:bb:cc:dd", f"Unexpected: {colonize('aabbccdd')}"
+assert colonize("112233445566") == "11:22:33:44:55:66"
+assert colonize("ab") == "ab"
+
+# generate_wwn: returns correctly formatted WWNs
+import re
+
+iqn = generate_wwn("iqn")
+assert iqn.startswith("iqn."), f"IQN should start with 'iqn.': {iqn}"
+assert re.match(r"iqn\.\d{4}-\d{2}\.", iqn), f"IQN format invalid: {iqn}"
+
+naa = generate_wwn("naa")
+assert naa.startswith("naa."), f"NAA should start with 'naa.': {naa}"
+
+serial = generate_wwn("unit_serial")
+assert re.match(r"[0-9a-f]{8}(-[0-9a-f]{4}){3}-[0-9a-f]{12}$", serial), \
+    f"unit_serial format invalid: {serial}"
+
+# normalize_wwn: accepts various representations and normalizes them
+wwn, wwn_type = normalize_wwn(["naa"], "naa.5000c50012345678")
+assert wwn_type == "naa", f"Expected naa, got {wwn_type}"
+assert wwn == "naa.5000c50012345678", f"Unexpected: {wwn}"
+
+# NAA without prefix gets one added
+wwn2, _ = normalize_wwn(["naa"], "5000c50012345678")
+assert wwn2 == "naa.5000c50012345678", f"Unexpected: {wwn2}"
+
+# RTSLibError is a proper exception
+try:
+    raise RTSLibError("test error")
+except RTSLibError as e:
+    assert str(e) == "test error"
+
+# RTSLibNotInCFSError is a subclass of RTSLibError
+assert issubclass(RTSLibNotInCFSError, RTSLibError)
+
+sys.exit(0)
+EOF