```
# Copyright (C) 2013 - 2017 Metrum Research Group, LLC
#
# This file is part of mrgsolve.
#
# mrgsolve is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# mrgsolve is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with mrgsolve. If not, see <http://www.gnu.org/licenses/>.
library(testthat)
library(mrgsolve)
library(dplyr)
Sys.setenv(R_TESTS="")
options("mrgsolve_mread_quiet"=TRUE)
code <- '
$PARAM LAG = 2.8
$CMT CENT
$MAIN
ALAG_CENT = LAG;
'
mod <- mcode("alag1", code)
context("Lagged doses")
test_that("Lagged bolus", {
out <- mod %>% ev(amt=100) %>% mrgsim(delta=0.01,add=c(2.7999999,2.8000001), end=10)
first <- with(as.tbl(out),time[which(CENT > 0)[1]])
expect_equal(first,2.8)
})
## Issue #109
test_that("Very small lag time doesn't crash", {
out <- mod %>% ev(amt=100) %>% param(LAG = 1E-30) %>% mrgsim
expect_is(out, "mrgsims")
expect_equal(out$time[which.max(out$CENT)],0)
out <- mod %>% ev(amt=100) %>% param(LAG = 2) %>% mrgsim
expect_is(out, "mrgsims")
expect_equal(out$time[which.max(out$CENT)],2)
out <- mod %>% ev(amt=100) %>% param(LAG = 1.5) %>% mrgsim
})
```

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