Nothing
test_f4 <- function() {
Re <- 400000
eps <- 0.004
D <- 1
expect_equal(f4(eps = eps, D = D, Re = Re), 0.0286751684)
expect_error(f4(eps = eps, D = D, Re = 2000))
expect_error(f4(eps = 0.06, D = D, Re = Re))
expect_error(f4(eps = 0.06, Re = Re))
invisible(NULL)
}
test_f4()
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