[fedcm-multi-idp-mediation-silent.https.html]
  expected:
    if os == "win": [ERROR, OK, TIMEOUT]
    [OK, TIMEOUT]
  [Mediation silent fails if there is no returning account.]
    expected: [PASS, FAIL]

  [Mediation silent succeeds when there is one returning account.]
    expected:
      if os == "win": [NOTRUN, FAIL, TIMEOUT]
      [FAIL, TIMEOUT]

  [Mediation silent fails when there is more than one returning account.]
    expected:
      if os == "win": [NOTRUN, FAIL]
      [FAIL, NOTRUN]