Inconsistent test subject URLs in JSON report

[jenstroeger]

Hi,

The files in an EPUB are (truncated):

mimetype
META-INF/container.xml
OPS/nav.xhtml
OPS/package.opf
OPS/xhtml/Sources.html
...

Those same files, with this or that failing issue, are reported as follows (truncated):

  "assertions": [
    {
      "@type": "earl:assertion",
      ...
      "earl:testSubject": {
        "url": "/OPS/nav.xhtml"
      }
    },
    {
      "@type": "earl:assertion",
      ...
      "earl:testSubject": {
        "url": "OPS/package.opf",
      }
    },
    {
      "@type": "earl:assertion",
      ...
      "earl:testSubject": {
        "url": "xhtml/Sources.html",
      }
    },
    {
      "@type": "earl:assertion",
      ...
      "earl:testSubject": {
        "url": "nav.xhtml",
      }
    },
    ...
]

Note how the "url" path sometimes does, sometimes does not contain the OPS/ root folder. This makes tooling and automation a bit difficult, and should be fixed.

Cheers.