This is a testharness.js-based test.
[FAIL] globalCompositeOperation destination
  assert_equals: composite operation expected "destination" but got "source-over"
[FAIL] globalCompositeOperation lighter
  assert_approx_equals: alpha: g=0 a=47 lighter g=0 a=255 expected 302 +/- 1.01 but got 255
[FAIL] globalCompositeOperation plus-darker
  assert_equals: composite operation expected "plus-darker" but got "source-over"
[FAIL] globalCompositeOperation plus-lighter
  assert_equals: composite operation expected "plus-lighter" but got "source-over"
Harness: the test ran to completion.