Fresh install

src/index.tsx

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+import { render } from 'solid-js/web';
+
+import { TodoList } from './todo-list';
+
+render(() => <TodoList />, document.getElementById('root'));

src/todo-list.test.tsx

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+import { describe, expect, test } from 'vitest';
+
+import { render, fireEvent } from 'solid-testing-library';
+
+import { TodoList } from './todo-list';
+
+describe('<TodoList />', () => {
+  test('it will render an text input and a button', () => {
+    const { getByPlaceholderText, getByText, unmount } = render(() => (
+      <TodoList />
+    ));
+    expect(getByPlaceholderText('new todo here')).toBeInTheDocument();
+    expect(getByText('Add Todo')).toBeInTheDocument();
+    unmount();
+  });
+
+  test('it will add a new todo', async () => {
+    const { getByPlaceholderText, getByText, unmount } = render(() => (
+      <TodoList />
+    ));
+    const input = getByPlaceholderText('new todo here') as HTMLInputElement;
+    const button = getByText('Add Todo');
+    input.value = 'test new todo';
+    fireEvent.click(button as HTMLInputElement);
+    expect(input.value).toBe('');
+    expect(getByText(/test new todo/)).toBeInTheDocument();
+    unmount();
+  });
+
+  test('it will mark a todo as completed', async () => {
+    const { getByPlaceholderText, findByRole, getByText, unmount } = render(
+      () => <TodoList />,
+    );
+    const input = getByPlaceholderText('new todo here') as HTMLInputElement;
+    const button = getByText('Add Todo') as HTMLButtonElement;
+    input.value = 'mark new todo as completed';
+    fireEvent.click(button);
+    const completed = (await findByRole('checkbox')) as HTMLInputElement;
+    expect(completed?.checked).toBe(false);
+    fireEvent.click(completed);
+    expect(completed?.checked).toBe(true);
+    const text = getByText('mark new todo as completed') as HTMLSpanElement;
+    expect(text).toHaveStyle({ 'text-decoration': 'line-through' });
+    unmount();
+  });
+});

src/todo-list.tsx

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+import { For, createSignal } from 'solid-js';
+
+type Todo = { id: number; text: string; completed: boolean };
+
+export const TodoList = () => {
+  let input!: HTMLInputElement;
+  let todoId = 0;
+  const [todos, setTodos] = createSignal<Todo[]>([]);
+  const addTodo = (text: string) => {
+    setTodos([...todos(), { id: ++todoId, text, completed: false }]);
+  };
+  const toggleTodo = (id: number) => {
+    setTodos(
+      todos().map((todo) =>
+        todo.id === id ? { ...todo, completed: !todo.completed } : todo,
+      ),
+    );
+  };
+
+  return (
+    <>
+      <div>
+        <input placeholder="new todo here" ref={input} />
+        <button
+          onClick={() => {
+            if (!input.value.trim()) return;
+            addTodo(input.value);
+            input.value = '';
+          }}
+        >
+          Add Todo
+        </button>
+      </div>
+      <For each={todos()}>
+        {(todo) => {
+          const { id, text } = todo;
+          return (
+            <div>
+              <input
+                type="checkbox"
+                checked={todo.completed}
+                onchange={[toggleTodo, id]}
+              />
+              <span
+                style={{
+                  'text-decoration': todo.completed ? 'line-through' : 'none',
+                }}
+              >
+                {text}
+              </span>
+            </div>
+          );
+        }}
+      </For>
+    </>
+  );
+};