Nothing

```
test_that("gen_time works correctly", {
x <- gen_time(mat_u, mat_f)
x_start <- gen_time(mat_u, mat_f)
x_singular <- gen_time(mat_u_singular, mat_f)
expect_length(x, 1L)
expect_gt(x, 0)
expect_length(x_start, 1L)
expect_gt(x_start, 0)
expect_identical(x_singular, NA_real_)
x_r0 <- gen_time(mat_u, mat_f, method = "R0")
expect_identical(x, x_r0)
x_po <- gen_time(mat_u, mat_f, method = "age_diff")
x_singular_po <- gen_time(mat_u_singular, mat_f, method = "age_diff")
expect_length(x_po, 1L)
expect_gt(x_po, 0)
expect_identical(x_singular_po, NA_real_)
x_co <- gen_time(mat_u, mat_f, method = "cohort")
x_singular_co <- gen_time(mat_u_singular, mat_f, method = "cohort")
expect_length(x_co, 1L)
expect_gt(x_co, 0)
expect_identical(x_singular_co, NA_real_)
})
test_that("gen_time warns and fails gracefully", {
expect_warning(gen_time(mat_u_survissue, mat_f))
expect_error(gen_time(mat_u_na, mat_f))
expect_error(gen_time(mat_u, mat_f_na))
expect_error(gen_time(mat_u_na, mat_f, method = "age_diff"))
expect_error(gen_time(mat_u, mat_f_na, method = "age_diff"))
expect_warning(gen_time(mat_u_survissue, mat_f))
expect_error(gen_time(mat_u_na, mat_f, method = "cohort"))
expect_error(gen_time(mat_u, mat_f_na, method = "cohort"))
})
```

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