First implementation of bindings

tests/test_integration.py

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+from dataclasses import dataclass
+from typing import Any
+
+import pytest
+from fasthtml.components import Input, Label
+from fasthtml.fastapp import fast_app
+
+from myfasthtml.controls.helpers import mk
+from myfasthtml.core.bindings import Binding
+from myfasthtml.core.commands import Command, CommandsManager
+from myfasthtml.test.testclient import MyTestClient, TestableElement
+
+
+def new_value(value):
+  return value
+
+
+@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
+
+
+class TestingCommand:
+  def test_i_can_trigger_a_command(self, user):
+    command = Command('test', 'TestingCommand', new_value, "this is my new value")
+    testable = TestableElement(user, mk.button('button', command))
+    testable.click()
+    assert user.get_content() == "this is my new value"
+  
+  def test_error_is_raised_when_command_is_not_found(self, user):
+    command = Command('test', 'TestingCommand', new_value, "this is my new value")
+    CommandsManager.reset()
+    testable = TestableElement(user, mk.button('button', command))
+    
+    with pytest.raises(ValueError) as exc_info:
+      testable.click()
+    
+    assert "not found." in str(exc_info.value)
+  
+  def test_i_can_play_a_complex_scenario(self, user, rt):
+    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:
+  def test_i_can_bind_input(self, user, rt):
+    @rt("/")
+    def index():
+      data = Data("hello world")
+      input_elt = Input(name="input_name")
+      label_elt = Label()
+      mk.manage_binding(input_elt, Binding(data))
+      mk.manage_binding(label_elt, Binding(data))
+      return input_elt, label_elt
+    
+    user.open("/")
+    user.should_see("")
+    testable_input = user.find_element("input")
+    testable_input.send("new value")
+    user.should_see("new value")  # the one from the label