示例#1
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def test_first_empty():
    result = add_binary('', '1010')
    assert (result == None)
示例#2
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def test_example2():
    result = add_binary('1010', '1011')
    assert (result == "10101")
示例#3
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def test_case2():
    result = add_binary('111', '101')
    assert (result == '1100')
示例#4
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def test_both_empty():
    result = add_binary('', '')
    assert (result == None)
示例#5
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def test_example1():
    result = add_binary('11', '1')
    assert (result == "100")
示例#6
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def test_second_nonbinary():
    result = add_binary('1010', '1301')
    assert (result == None)
示例#7
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def test_first_nonbinary():
    result = add_binary('1301', '1010')
    assert (result == None)
示例#8
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def test_second_empty():
    result = add_binary('1010', '')
    assert (result == None)