scripts: twister: adding overlaying option in harness config

Adding functionality to split harness_config into common and test-case
specific part, which are joined together for any given test.

Signed-off-by: Artur Dobrynin <[email protected]>

Author: ardo-nordic

scripts/pylib/twister/twisterlib/config_parser.py

@@ -182,7 +182,7 @@ def get_scenario(self, name: str) -> dict[str, Any]:
                 if k == "filter":
                     d[k] = f"({d[k]}) and ({v})"
                 elif k not in ("extra_conf_files", "extra_overlay_confs",
-                               "extra_dtc_overlay_files"):
+                               "extra_dtc_overlay_files", "harness_config"):
                     if isinstance(d[k], str) and isinstance(v, list):
                         d[k] = [d[k]] + v
                     elif isinstance(d[k], list) and isinstance(v, str):
@@ -204,6 +204,22 @@ def get_scenario(self, name: str) -> dict[str, Any]:
             else:
                 d[k] = v
 
+        harness_config = copy.deepcopy(self.common.get("harness_config", {}))
+        if 'harness_config' in self.scenarios[name]:
+            if harness_config:
+                for k, v in self.scenarios[name]['harness_config'].items():
+                    if k in harness_config:
+                        if isinstance(harness_config[k], list):
+                            harness_config[k] += v if isinstance(v, list) else [v]
+                        else:
+                            harness_config[k] = v
+                    else:
+                        harness_config[k] = v
+            else:
+                harness_config = self.scenarios[name]['harness_config']
+
+        d['harness_config'] = harness_config
+
         # Compile conf files in to a single list. The order to apply them is:
         #  (1) CONF_FILEs extracted from common['extra_args']
         #  (2) common['extra_conf_files']