Fixing failing and disabled test following bump in dependency to version 1.5.15 for package org.hl7.fhir.testcases:fhir-test-cases

[epeartree]

The project parent POM declares dependency to package org.hl7.fhir.testcases:fhir-test-cases which was bumped to version 1.5.15. As a result, the test defined in class FhirPatchCoreTest is failing for two reasons:

1- the test tries to parse file /org/hl7/fhir/testcases/r5/patch/fhir-path-tests.xml provided by the dependency but fails since xml closing tags are missing on line 231 and 245. this issue should be fixed by core PR-184;

2- the test also fails due to the introduction of new XML tags in both parsed files (see FhirPatchCoreTest#parameters). the test expects a format of:

<case>
    <input></input>
    <diff></diff>
    <output></output>
</case>

where version 1.5.15 introduces tag <error> that can replace tag <output>. the new tag can be found:

• line 1413 for file /org/hl7/fhir/testcases/r4/patch/fhir-path-tests.xml
• line 1528 for file /org/hl7/fhir/testcases/r5/patch/fhir-path-tests.xml

What needs to be done:
To determine a proper way to handle the new tag to get the FhirPatchCoreTest passing again.