First implementation of bindings

tests/controls/test_helpers.py

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+from dataclasses import dataclass
+from typing import Any
+
+import pytest
+from fasthtml.components import *
+from fasthtml.fastapp import fast_app
+
+from myfasthtml.controls.helpers import mk
+from myfasthtml.core.bindings import Binding
+from myfasthtml.core.commands import Command
+from myfasthtml.test.matcher import matches
+from myfasthtml.test.testclient import MyTestClient
+
+
+@dataclass
+class Data:
+  value: Any
+
+
+@pytest.fixture()
+def user():
+  test_app, rt = fast_app(default_hdrs=False)
+  user = MyTestClient(test_app)
+  return user
+
+
+@pytest.fixture()
+def rt(user):
+  return user.app.route
+
+
+def test_i_can_mk_button():
+  button = mk.button('button')
+  expected = Button('button')
+  
+  assert matches(button, expected)
+
+
+def test_i_can_mk_button_with_attrs():
+  button = mk.button('button', id="button_id", class_="button_class")
+  expected = Button('button', id="button_id", class_="button_class")
+  assert matches(button, expected)
+
+
+def test_i_can_mk_button_with_command(user, rt):
+  def new_value(value): return value
+  
+  command = Command('test', 'TestingCommand', new_value, "this is my new value")
+  
+  @rt('/')
+  def get(): return mk.button('button', command)
+  
+  user.open("/")
+  user.should_see("button")
+  
+  user.find_element("button").click()
+  user.should_see("this is my new value")
+
+
+class TestingBindings:
+  @pytest.fixture()
+  def data(self):
+    return Data("value")
+  
+  def test_i_can_bind_an_input(self, data):
+    elt = Input(name="input_elt", value="hello")
+    binding = Binding(data, "value")
+    elt = mk.manage_binding(elt, binding)
+    
+    # element is updated
+    assert "hx-post" in elt.attrs
+    assert "hx-vals" in elt.attrs
+    assert "b_id" in elt.attrs["hx-vals"]
+    
+    # binding is also updated
+    assert binding.ft == elt
+    assert binding.ft_name == "input_elt"
+    
+  def test_i_can_bind_none_input(self, data):
+    elt = Label("hello", name="input_elt")
+    binding = Binding(data, "value")
+    elt = mk.manage_binding(elt, binding)
+    
+    # element is updated
+    assert "hx-post" not in elt.attrs
+    assert "hx-get" not in elt.attrs
+    
+    # binding is also updated
+    assert binding.ft == elt
+    assert binding.ft_name == "input_elt"
+