R Under development (unstable) (2026-01-25 r89330 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(xhaz)
> 
> test_check("xhaz")
Saving _problems/test-as-xhaz-5.R
[ FAIL 1 | WARN 0 | SKIP 0 | PASS 1 ]

══ Failed tests ════════════════════════════════════════════════════════════════
── Error ('test-as-xhaz.R:5:3'): as.xhaz puts 'xhaz' first and preserves other classes ──
Error in `expect_class_first(y, "xhaz")`: could not find function "expect_class_first"

[ FAIL 1 | WARN 0 | SKIP 0 | PASS 1 ]
Error:
! Test failures.
Execution halted