Nothing
context("test-gravity_station")
test_that("gravity_station works", {
expect_equal(gravity_station(0, 0), 9.78032677, tolerance = 1e-6)
expect_equal(gravity_station(90, 0), 9.832186, tolerance = 1e-6)
expect_equal(gravity_station(45, 0), 9.806199, tolerance = 1e-6)
expect_equal(gravity_station(0, 1000), 9.777257, tolerance = 1e-6)
expect_equal(gravity_station(0, 10000), 9.749696, tolerance = 1e-6)
})
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