def test_6942(indexer_al):
    # check that the .at __setitem__ after setting "Live" actually sets the data
    start = Timestamp("2014-04-01")
    t1 = Timestamp("2014-04-23 12:42:38.883082")
    t2 = Timestamp("2014-04-24 01:33:30.040039")

    dti = date_range(start, periods=1)
    orig = DataFrame(index=dti, columns=["timenow", "Live"])

    df = orig.copy()
    indexer_al(df)[start, "timenow"] = t1

    df["Live"] = True

    df.at[start, "timenow"] = t2
    assert df.iloc[0, 0] == t2