rxTest({
  # Test loading, and unloading of models

  rigid.txt <- "
y1(0)    = 1
y2(0)    = 0
y3(0)    = 0.9
a1       = -2
a2       = 1.25
a3       = -0.5
d/dt(y1) = a1*y2*y3
d/dt(y2) = a2*y1*y3
d/dt(y3) = a3*y1*y2
"

  rigid <- rxode2(rigid.txt)

  test_that("loading and unloading works.", {
    dll <- rxDll(rigid)
    expect_true(rxDllLoaded(rigid))
    expect_true(file.exists(dll))
    rxUnload(rigid)
    expect_false(rxDllLoaded(rigid))
    expect_true(file.exists(dll))
    rxLoad(rigid)
    expect_true(rxDllLoaded(rigid))
    expect_true(file.exists(dll))
    rxDelete(rigid)
    expect_false(rxDllLoaded(rigid))
    expect_false(file.exists(dll))
    rxLoad(rigid)
    expect_true(rxDllLoaded(rigid))
    expect_true(file.exists(dll))
    rxDelete(rigid)
    rxSyncOptions()
    expect_false(rxDllLoaded(rigid))
    expect_false(file.exists(dll))
    ## Test $ syntax
    rigid$compile()
    expect_true(rxDllLoaded(rigid))
    expect_true(file.exists(dll))
    rigid$delete()
    expect_false(rxDllLoaded(rigid))
    expect_false(file.exists(dll))
    rigid$dynLoad()
    expect_true(rxDllLoaded(rigid))
    expect_true(file.exists(dll))
    rigid$dynUnload()
    expect_false(rxDllLoaded(rigid))
    expect_true(file.exists(dll))
  })
})