Support multi-line failure/error messages

[VirtualTim]

What feature do you want to see added?

In my tests, I sometimes output multiline failure messages. This is useful, for example, when a test is comparing json output.
This doesn't appear to be supported, new lines are converted to spaces.
I am using JUnit and xUnit plugins, but I'm pretty sure this comes from this plugin.

Eg:

<?xml version="1.0" ?>
<testsuite name="apollo.windows.testcase.apollo.data.custom_properties.get_custom_properties" tests="1" failures="1" errors="0" skipped="0" time="40.505">
    <testcase name="testbed.apollo.windows.testcase.apollo.data.custom_properties.get_custom_properties" time="17.606">
        <failure type="Assertion" message="AssertionError: There were problems with the Custom Properties of the sample data:
Custom Properties of Rgb int16 small.int16-rgb did not match reference.
{'crs[23 chars]6', 'unit': 'DEGREES', 'pixelSizeX': 0.0272188[149 chars]1040} != {'crs[23 chars]6', 'dataType': 'INT16', 'pyramids': 'External[184 chars]1040}
  {'bands': 3,
   'crs_horizontal': 'EPSG:4326',
   'dataType': 'INT16',
   'height': 1040,
   'pixelSizeX': 0.027218811502027925,
-  'pixelSizeY': -0.02722409367982037,
?                        - ^^^  - ---

+  'pixelSizeY': -0.02721881150202792,
?                       +++++++  ^

-  'pyramids': 'None',
?               ^^ ^

+  'pyramids': 'External',
?               ^^^^^ ^^

+  'pyramidsApolloCreated': True,
   'type': 'Continuous',
   'unit': 'DEGREES',
   'width': 2302}
Reference file has been copied to test artifacts for visual comparison.
Custom Properties of Sandiego1m null.sampleiws-usa-sandiego1m null did not match reference.
{'crs[96 chars]0000096166241228, 'dataType': 'UINT8', 'width'[76 chars]2044} != {'crs[96 chars]0000056308598955, 'dataType': 'UINT8', 'width'[76 chars]2044}
  {'bands': 3,
   'crs_horizontal': 'EPSG:26911',
   'dataType': 'UINT8',
   'height': 2044,
   'pixelSizeX': 1.000005630859949,
-  'pixelSizeY': -1.0000096166241228,
+  'pixelSizeY': -1.0000056308598955,
   'pyramids': 'Internal',
   'type': 'Continuous',
   'unit': 'METERS',
   'width': 2058}
Reference file has been copied to test artifacts for visual comparison.
"/>
    </testcase>
</testsuite>

becomes:

Upstream changes

No response

Are you interested in contributing this feature?

No response