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-rw-r--r--testing/web-platform/tests/orientation-event/resources/orientation-event-helpers.js11
1 files changed, 11 insertions, 0 deletions
diff --git a/testing/web-platform/tests/orientation-event/resources/orientation-event-helpers.js b/testing/web-platform/tests/orientation-event/resources/orientation-event-helpers.js
index 01e91c62ae..dab876fc6a 100644
--- a/testing/web-platform/tests/orientation-event/resources/orientation-event-helpers.js
+++ b/testing/web-platform/tests/orientation-event/resources/orientation-event-helpers.js
@@ -203,6 +203,17 @@ function generateOrientationData(alpha, beta, gamma, absolute) {
return orientationData;
}
+function assertValueIsCoarsened(value) {
+ // Checks that the precision of the value is at most 0.1.
+ // https://www.w3.org/TR/orientation-event/ specification defines that all
+ // measurements are required to be coarsened to 0.1 degrees, 0.1 m/s^2 or
+ // 0.1 deg/s.
+ const resolution = 0.1;
+ const coarsenedValue = Math.round(value / resolution) * resolution;
+ assert_approx_equals(value, coarsenedValue, Number.EPSILON,
+ `Expected ${value}'s precision to be at most ${resolution}`);
+}
+
function assertEventEquals(actualEvent, expectedEvent) {
// If two doubles differ by less than this amount, we can consider them
// to be effectively equal.