R Under development (unstable) (2026-03-19 r89661 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(tptest)
> 
> test_check("tptest")
tptest: Turning Point and Inflection Point Test
Lind & Mehlum (2010) with Extensions
--------------------------------------------------------------
Functional form : quad
Interval        : [-2.9197, 2.9514]
Detected shape  : U
Turning point   : 0.7596
Delta SE        : 0.1405
95% CI (delta)  : [0.4808, 1.0384]
--------------------------------------------------------------
Sasabuchi Test for U:
  Slope at lower bound : -2.1676  (t = -8.8475, p = 0.0000)
  Slope at upper bound : 1.2913  (t = 5.3520, p = 0.0000)
  t_sac = 5.3520  ***   p = 0.0000
--------------------------------------------------------------
*** p<0.01, ** p<0.05, * p<0.10
--------------------------------------------------------------
tptest: Turning Point and Inflection Point Test
Lind & Mehlum (2010) with Extensions
--------------------------------------------------------------
Functional form : quad
Interval        : [-2.9197, 2.9514]
Detected shape  : U
Turning point   : 0.7596
Delta SE        : 0.1405
95% CI (delta)  : [0.4808, 1.0384]
--------------------------------------------------------------
Sasabuchi Test for U:
  Slope at lower bound : -2.1676  (t = -8.8475, p = 0.0000)
  Slope at upper bound : 1.2913  (t = 5.3520, p = 0.0000)
  t_sac = 5.3520  ***   p = 0.0000
--------------------------------------------------------------
*** p<0.01, ** p<0.05, * p<0.10
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 7 ]
> 
> proc.time()
   user  system elapsed 
   0.67    0.07    0.73