def longest_capitalized_word(sentence):
    words = sentence.split(" ")
    longest = ""
    length = 0
    for word in words:
        if len(word) > 0:
            capitalized = word[0].isupper()
            if capitalized and len(word) > length:
                longest = word
                length = len(word)
    return longest


def test_longest_capitalized_word():
    assert longest_capitalized_word("There are Several capitalized Words Here") == "Several"
    assert longest_capitalized_word("dog") == ""
    assert longest_capitalized_word("Hello World") == "Hello"
    assert longest_capitalized_word("") == ""

tests = [test_longest_capitalized_word]

if __name__ == "__main__":
    for test in tests:
        test()
    print("All tests passed")