Introduce CommandTable.is_valid()

* is_valid() can be used to validate the command table

src/zhinst/toolkit/command_table.py

@@ -338,6 +338,9 @@ class CommandTable:
             No validation happens during command table entry modifications, thus
             making the creation of the command table faster.
 
+            Method `is_valid()` can be used for command table validation when active
+            validation is disabled. It is recommended to avoid it in production code.
+
     .. versionadded:: 0.5.0
        The ``active_validation`` parameter was added.
 
@@ -483,6 +486,36 @@ def as_dict(self) -> dict:
             _validate_instance(result, self._ct_schema)
         return result
 
+    def is_valid(self, raise_for_invalid: bool = False) -> bool:
+        """Checks if the command table is valid.
+
+        Args:
+            raise_for_invalid: Raises exception if the command table is invalid.
+                The flag can be used for getting feedback on what is wrong in
+                the command table.
+
+        Returns:
+            True if the command table is valid.
+
+        Raises:
+            ValidationError: If `raise_for_invalid` was set to `True` and the
+                command table is invalid.
+
+        .. versionadded:: 0.6.2
+        """
+        # Due to active_validation having a state, we need to force it to True.
+        orig_state = self._active_validation
+        try:
+            self._active_validation = True if self._active_validation is False else True
+            self.as_dict()
+            self._active_validation = orig_state
+            return True
+        except ValidationError as e:
+            self._active_validation = orig_state
+            if raise_for_invalid:
+                raise e
+            return False
+
     def update(self, command_table: t.Union[str, dict]) -> None:
         """Update the existing instance of ``CommandTable`` with command table JSON.
 

tests/command_table/test_command_table.py

@@ -1,5 +1,5 @@
 import json
-from unittest.mock import patch
+from unittest.mock import patch, Mock
 
 import jsonref
 import jsonschema
@@ -162,11 +162,27 @@ def test_command_table_active_validation_table(command_table_schema):
     ct = CommandTable(command_table_schema, active_validation=False)
     ct.table[999999].amplitude00.value = 1
     ct.as_dict()
+    assert ct.is_valid() is False
     ct.active_validation = True
     with pytest.raises(ValidationError):
         ct.as_dict()
 
 
+@pytest.mark.parametrize("state", [True, False])
+def test_table_is_valid_active_validation_state_persists(command_table, state):
+    command_table.active_validation = state
+    command_table.is_valid() is True
+    assert command_table.active_validation is state
+
+    command_table.as_dict = Mock(side_effect=ValidationError)
+    command_table.is_valid() is False
+    assert command_table.active_validation is state
+
+    with pytest.raises(ValidationError):
+        command_table.is_valid(raise_for_invalid=True)
+    assert command_table.active_validation is state
+
+
 def test_command_table_active_validation_parent_entry(command_table_schema):
     ct = CommandTable(command_table_schema, active_validation=True)
     ct.table[0]