improve coverage

tests/node_tests/value_io.py

@@ -1,11 +1,13 @@
+import math
 from backend.data_types import RecordTable
+from backend.execution_context import active_node, execution_callbacks
 
 
 def test_value_display():
     from backend.nodes.value_io import ValueIO
 
     node = ValueIO()
-    value_spec = ValueIO.INPUT_TYPES()["required"]["value"]
+    value_spec = ValueIO.INPUT_TYPES()["optional"]["value"]
     assert value_spec[0] == "FLOAT"
     assert value_spec[1]["accepted_types"] == ["RECORD_TABLE"]
 
@@ -13,7 +15,7 @@ def test_value_display():
     ValueIO._broadcast_value_fn = lambda node_id, payload: captured.append((node_id, payload))
     ValueIO._current_node_id = "test"
 
-    result = node.display_value(3.25)
+    result = node.display_value(value=3.25)
     assert result == (3.25,)
     assert captured == [("test", {"value": 3.25})]
 
@@ -21,8 +23,42 @@ def test_value_display():
         {"quantity": "delta X", "value": 1.7e-7, "unit": "m"},
         {"quantity": "delta Y", "value": 463, "unit": "count"},
     ])
-    result = node.display_value(measurements, measurement="delta X")
+    result = node.display_value(value=measurements, measurement="delta X")
     assert result == (1.7e-7,)
     assert captured[-1] == ("test", {"value": 1.7e-7, "unit": "m"})
 
     ValueIO._broadcast_value_fn = None
+
+
+def test_value_display_string_input():
+    from backend.nodes.value_io import ValueIO
+
+    node = ValueIO()
+    values = []
+    with execution_callbacks(value=lambda nid, v: values.append(v)), active_node("n1"):
+        # plain number
+        result = node.display_value(number_input="42")
+    assert result == (42.0,)
+    assert values[-1]["value"] == 42.0
+
+    values.clear()
+    with execution_callbacks(value=lambda nid, v: values.append(v)), active_node("n1"):
+        # negative number
+        result = node.display_value(number_input="-3.14")
+    assert math.isclose(result[0], -3.14)
+    assert math.isclose(values[-1]["value"], -3.14)
+
+
+def test_value_display_table_emits_table():
+    from backend.nodes.value_io import ValueIO
+
+    node = ValueIO()
+    tables = []
+    measurements = RecordTable([
+        {"quantity": "Rq", "value": 0.42, "unit": "nm"},
+    ])
+    with execution_callbacks(table=lambda nid, t: tables.append(t)), active_node("n1"):
+        result = node.display_value(value=measurements, measurement="Rq")
+    assert result == (0.42,)
+    assert len(tables) == 1
+    assert tables[0][0]["quantity"] == "Rq"