Add docstring for jupyterviz make_user_input that documents supported…

… inputs (#1784)

* Add docstring for make_user_input that documents supported inputs

* Use field name as user input fallback label; error on unsupported type

* Preliminary unit tests for jupyter viz make_user_input method

* Remove unused variable flagged by ruff lint

mesa/experimental/jupyter_viz.py

@@ -32,10 +32,10 @@ def JupyterViz(
 
     # 1. User inputs
     user_inputs = {}
-    for k, v in model_params_input.items():
-        user_input = solara.use_reactive(v["value"])
-        user_inputs[k] = user_input.value
-        make_user_input(user_input, k, v)
+    for name, options in model_params_input.items():
+        user_input = solara.use_reactive(options["value"])
+        user_inputs[name] = user_input.value
+        make_user_input(user_input, name, options)
 
     # 2. Model
     def make_model():
@@ -142,29 +142,44 @@ def check_param_is_fixed(param):
         return True
 
 
-def make_user_input(user_input, k, v):
-    if v["type"] == "SliderInt":
+def make_user_input(user_input, name, options):
+    """Initialize a user input for configurable model parameters.
+    Currently supports :class:`solara.SliderInt`, :class:`solara.SliderFloat`,
+    and :class:`solara.Select`.
+
+    Args:
+        user_input: :class:`solara.reactive` object with initial value
+        name: field name; used as fallback for label if 'label' is not in options
+        options: dictionary with options for the input, including label,
+        min and max values, and other fields specific to the input type.
+    """
+    # label for the input is "label" from options or name
+    label = options.get("label", name)
+    input_type = options.get("type")
+    if input_type == "SliderInt":
         solara.SliderInt(
-            v.get("label", "label"),
+            label,
             value=user_input,
-            min=v.get("min"),
-            max=v.get("max"),
-            step=v.get("step"),
+            min=options.get("min"),
+            max=options.get("max"),
+            step=options.get("step"),
         )
-    elif v["type"] == "SliderFloat":
+    elif input_type == "SliderFloat":
         solara.SliderFloat(
-            v.get("label", "label"),
+            label,
             value=user_input,
-            min=v.get("min"),
-            max=v.get("max"),
-            step=v.get("step"),
+            min=options.get("min"),
+            max=options.get("max"),
+            step=options.get("step"),
         )
-    elif v["type"] == "Select":
+    elif input_type == "Select":
         solara.Select(
-            v.get("label", "label"),
-            value=v.get("value"),
-            values=v.get("values"),
+            label,
+            value=options.get("value"),
+            values=options.get("values"),
         )
+    else:
+        raise ValueError(f"{input_type} is not a supported input type")
 
 
 def make_space(model, agent_portrayal):

tests/test_jupyter_viz.py

@@ -0,0 +1,48 @@
+import unittest
+from unittest.mock import patch
+
+from mesa.experimental.jupyter_viz import make_user_input
+
+
+class TestMakeUserInput(unittest.TestCase):
+    def test_unsupported_type(self):
+        """unsupported input type should raise ValueError"""
+        # bogus type
+        with self.assertRaisesRegex(ValueError, "not a supported input type"):
+            make_user_input(10, "input", {"type": "bogus"})
+        # no type is specified
+        with self.assertRaisesRegex(ValueError, "not a supported input type"):
+            make_user_input(10, "input", {})
+
+    @patch("mesa.experimental.jupyter_viz.solara")
+    def test_slider_int(self, mock_solara):
+        value = 10
+        name = "num_agents"
+        options = {
+            "type": "SliderInt",
+            "label": "number of agents",
+            "min": 10,
+            "max": 20,
+            "step": 1,
+        }
+        make_user_input(value, name, options)
+        mock_solara.SliderInt.assert_called_with(
+            options["label"],
+            value=value,
+            min=options["min"],
+            max=options["max"],
+            step=options["step"],
+        )
+
+    @patch("mesa.experimental.jupyter_viz.solara")
+    def test_label_fallback(self, mock_solara):
+        """name should be used as fallback label"""
+        value = 10
+        name = "num_agents"
+        options = {
+            "type": "SliderInt",
+        }
+        make_user_input(value, name, options)
+        mock_solara.SliderInt.assert_called_with(
+            name, value=value, min=None, max=None, step=None
+        )