test_that("NewickParser handles empty input", {
expect_error(tqdist_OneToManyQuartetAgreementChar(character(0), character(0)),
"string_in has length 0")
expect_error(tqdist_QuartetAgreementChar(character(0), "(t1, (t2, t3));"),
"string_in has length 0")
expect_error(tqdist_QuartetAgreementChar("(t1, (t2, t3));", character(0)),
"string_in has length 0")
})
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