tests/testthat/test-independent-test-gsDelta.R

In gsDesign: Group Sequential Design

## The benchmark values have been obtained from the stopping boundaries

## chart in the East 6.5 workbook - benchmarks/gsqplot.cywx

# For comparing floating-point numbers, an exact match cannot be expected. 
# For such test cases, the tolerance is set to 1e-6 (= 0.000001), 
# a sufficiently low value
#-------------------------------------------------------------------------------


test_that(desc = "check boundaries on standardized treatment effect scale",
  code = {
    x <- gsDesign(k = 2, test.type = 1, alpha = 0.025, beta = 0.1, 
                  delta1 = 0.3, sfu = sfLDOF)
    
    delta_star <- gsDelta(z = x$upper$bound, i = 1:2, x = x)
    expect_lte(abs(delta_star[1] - 0.38709581), 1e-6)
    expect_lte(abs(delta_star[2] - 0.18188158), 1e-6)
})