This is a testharness.js-based test.
[FAIL] ruby display (math)
  assert_approx_equals: inline size expected 50 +/- 1 but got 40
[FAIL] block display with column width (math)
  assert_approx_equals: block size expected 78 +/- 1 but got 45
[FAIL] block display with column width (mrow)
  assert_approx_equals: block size expected 78 +/- 1 but got 45
Harness: the test ran to completion.