Added first controls

tests/testclient/test_finds.py

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+import pytest
+from fasthtml.components import Div, Span
+
+from myfasthtml.test.matcher import find
+
+
+@pytest.mark.parametrize('ft, expected', [
+    ("hello", "hello"),
+    (Div(id="id1"), Div(id="id1")),
+    (Div(Span(id="span_id"), id="div_id1"), Div(Span(id="span_id"), id="div_id1")),
+    (Div(id="id1", id2="id2"), Div(id="id1")),
+    (Div(Div(id="id2"), id2="id1"), Div(id="id1")),
+])
+def test_i_can_find(ft, expected):
+  assert find(expected, expected) == [expected]
+
+
+def test_find_element_by_id_in_a_list():
+  a = Div(id="id1")
+  b = Div(id="id2")
+  c = Div(id="id3")
+  
+  assert find([a, b, c], b) == [b]
+
+
+def test_i_can_find_sub_element():
+  a = Div(id="id1")
+  b = Div(a, id="id2")
+  c = Div(b, id="id3")
+  
+  assert find(c, a) == [a]
+
+
+@pytest.mark.parametrize('ft, expected', [
+    (None, Div(id="id1")),
+    (Span(id="id1"), Div(id="id1")),
+    (Div(id2="id1"), Div(id="id1")),
+    (Div(id="id2"), Div(id="id1")),
+])
+def test_i_cannot_find(ft, expected):
+  with pytest.raises(AssertionError):
+    find(expected, ft)