Enable try-add method in CAS test-framework API

test/functional/api/cas/casadm.py

@@ -72,6 +72,13 @@ def remove_detached(core_device: Device, shortcut: bool = False):
     return output
 
 
+def try_add(core_device: Device, cache_id: int):
+    output = TestRun.executor.run(script_try_add_cmd(str(cache_id), core_device.system_path))
+    if output.exit_code != 0:
+        raise CmdException("Failed to execute try add script command.", output)
+    return Core(core_device.system_path, cache_id)
+
+
 def reset_counters(cache_id: int, core_id: int = None, shortcut: bool = False):
     _core_id = None if core_id is None else str(core_id)
     output = TestRun.executor.run(

test/functional/api/cas/cli.py

@@ -19,6 +19,11 @@ def add_core_cmd(cache_id: str, core_dev: str, core_id: str = None, shortcut: bo
     return casadm_bin + command
 
 
+def script_try_add_cmd(cache_id: str, core_dev: str):
+    return f"{casadm_bin} --script --add-core --try-add --cache-id {cache_id} " \
+           f"--core-device {core_dev}"
+
+
 def remove_core_cmd(cache_id: str, core_id: str, force: bool = False, shortcut: bool = False):
     command = f" -R -i {cache_id} -j {core_id}" if shortcut \
         else f" --remove-core --cache-id {cache_id} --core-id {core_id}"

test/functional/api/cas/core.py

@@ -32,7 +32,9 @@ class Core(Device):
         self.core_device = Device(core_device)
         self.system_path = None
         core_info = self.__get_core_info()
+        if core_info["core_id"] != "-":
             self.core_id = int(core_info["core_id"])
+        if core_info["exp_obj"] != "-":
             Device.__init__(self, core_info["exp_obj"])
         self.cache_id = cache_id