context("add_degrees")
test_that("add_degrees spins properly", {
expect_true(abs(add_degrees(0, 0) - 0) <= .00000001)
expect_true(abs(add_degrees(-90, 0) - -90) <= .00000001)
expect_true(abs(add_degrees(-180, 0) - -180)<= .00000001)
expect_true(abs(add_degrees(-180, 90) - -90)<= .00000001)
expect_true(abs(add_degrees(180, 360) - 180)<= .00000001)
expect_true(abs(add_degrees(150, 40) - -170)<= .00000001)
expect_true(abs(add_degrees(90, -100) - -10)<= .00000001)
})
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