[test][core] Improve plural handling for plurals with complex structure.

beat/cmdline/test/core.py

@@ -71,6 +71,10 @@ class AssetLocalTest:
         use_cache = kwargs.get("cache", "cache")
         asset_type = kwargs.get("asset_type", cls.asset_type)
 
+        cmd_group = common.TYPE_PLURAL[asset_type]
+        if "/" in cmd_group:
+            cmd_group = cmd_group.split("/")[-1]
+
         runner = CliRunner()
         with runner.isolated_filesystem():
             result = runner.invoke(
@@ -87,7 +91,7 @@ class AssetLocalTest:
                     use_cache,
                     "--platform",
                     use_platform,
-                    common.TYPE_PLURAL[asset_type],
+                    cmd_group,
                 ]
                 + list(args),
                 catch_exceptions=False,