```
# NOT RUN {
SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
p <- c( 10, 50, 125, 250, 600, 1000)
saturation_fraction <- 1
tf <- gsw_t_freezing(SA, p, saturation_fraction)
expect_equal(tf, c(-1.902730710149803, -1.942908619287183, -2.006861069199743,
-2.090985086875259, -2.351293130342102, -2.660498762776720))
# }
```

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