Checks that custom formatters cannot return huge JSONML arrays.

Running test: setUp

Running test: testHugeHeader
error: Custom Formatter Failed: Uncaught JSONML is too large
no custom preview

Running test: testNestedHeader
error: Custom Formatter Failed: Uncaught JSONML is too large
no custom preview

Running test: testHugeBody
{
    bodyGetterId : <bodyGetterId>
    header : ["span","huge-body"]
}
error: Custom Formatter Failed: Uncaught JSONML is too large
{
    type : undefined
}
