ERROR: 'Error: upgrade failed'
    The test "CustomElement   CustomElement Element - re-upgrade with a failed promised" resulted in a call to console.error. (See above line.)
    ⤷ If the error is not expected, fix the code that generated the error.
    ⤷ If the error is expected (and synchronous), use the following pattern to wrap the test code that generated the error:
        'allowConsoleError(() => { <code that generated the error> });'
    ⤷ If the error is expected (and asynchronous), use the following pattern at the top of the test:
        'expectAsyncConsoleError(<string or regex>[, <number of times the error message repeats>]);'
ERROR: 'intentional [object HTMLElement]'
    The test "CustomElement   CustomElement should anticipate build errors" resulted in a call to console.error. (See above line.)
    ⤷ If the error is not expected, fix the code that generated the error.
    ⤷ If the error is expected (and synchronous), use the following pattern to wrap the test code that generated the error:
        'allowConsoleError(() => { <code that generated the error> });'
    ⤷ If the error is expected (and asynchronous), use the following pattern at the top of the test:
        'expectAsyncConsoleError(<string or regex>[, <number of times the error message repeats>]);'
ERROR: '[Resource] failed to build: amp-test#1 Error: intentional'
    The test "CustomElement   CustomElement should anticipate build errors" resulted in a call to console.error. (See above line.)
    ⤷ If the error is not expected, fix the code that generated the error.
    ⤷ If the error is expected (and synchronous), use the following pattern to wrap the test code that generated the error:
        'allowConsoleError(() => { <code that generated the error> });'
    ⤷ If the error is expected (and asynchronous), use the following pattern at the top of the test:
        'expectAsyncConsoleError(<string or regex>[, <number of times the error message repeats>]);'
ERROR: 'The "height" attribute is missing:  [object HTMLElement]'
    The test "CustomElement   Loading Indicator should toggle loading off after layout complete" resulted in a call to console.error. (See above line.)
    ⤷ If the error is not expected, fix the code that generated the error.
    ⤷ If the error is expected (and synchronous), use the following pattern to wrap the test code that generated the error:
        'allowConsoleError(() => { <code that generated the error> });'
    ⤷ If the error is expected (and asynchronous), use the following pattern at the top of the test:
        'expectAsyncConsoleError(<string or regex>[, <number of times the error message repeats>]);'
ERROR: 'The "height" attribute is missing:  [object HTMLElement]'
    The test "CustomElement   Loading Indicator should toggle loading off after layout failed" resulted in a call to console.error. (See above line.)
    ⤷ If the error is not expected, fix the code that generated the error.
    ⤷ If the error is expected (and synchronous), use the following pattern to wrap the test code that generated the error:
        'allowConsoleError(() => { <code that generated the error> });'
    ⤷ If the error is expected (and asynchronous), use the following pattern at the top of the test:
        'expectAsyncConsoleError(<string or regex>[, <number of times the error message repeats>]);'
ERROR: 'The "height" attribute is missing:  [object HTMLElement]'
    The test "CustomElement   Loading Indicator should disable toggle loading on after layout failed" resulted in a call to console.error. (See above line.)
    ⤷ If the error is not expected, fix the code that generated the error.
    ⤷ If the error is expected (and synchronous), use the following pattern to wrap the test code that generated the error:
        'allowConsoleError(() => { <code that generated the error> });'
    ⤷ If the error is expected (and asynchronous), use the following pattern at the top of the test:
        'expectAsyncConsoleError(<string or regex>[, <number of times the error message repeats>]);'