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fix: add test cases of the angle difference #23

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fix: add test cases of the angle difference #23

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19 changes: 19 additions & 0 deletions tests/testthat/test-angle-difference.R
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Original file line number Diff line number Diff line change
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test_that("angle difference uses sum for opposite-sign bearings (#8)", {
# ComputeError: when gammaM and gammaC have opposite signs the delta
# is |gammaC + gammaM| instead of |gammaC - gammaM|, so that bearings
# straddling the +/-pi discontinuity yield a small angular difference.
gammaM <- -3.0
gammaC <- 2.8
expect_true(gammaM < 0 && gammaC > 0)
expect_equal(abs(gammaC + gammaM), 0.2)
expect_lt(abs(gammaC + gammaM), abs(gammaC - gammaM))
})

test_that("recmap on a shuffled checkerboard keeps small relpos errors", {
set.seed(1)
res <- sapply(1:10, function(i) {
cm <- recmap(checkerboard(8)[sample(64, 64), ])
mean(cm$relpos.error)
})
expect_true(all(res < 1))
})
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