Expose file path from XML Test Report artifact

app/serializers/test_case_entity.rb

@@ -6,6 +6,7 @@ class TestCaseEntity < Grape::Entity
   expose :status
   expose :name
   expose :classname
+  expose :file
   expose :execution_time
   expose :system_output
   expose :stack_trace

changelogs/unreleased/expose-junit-spec-file-path.yml

+---
+title: Expose file path from XML Test Report artifact
+merge_request: 43594
+author:
+type: changed

spec/fixtures/api/schemas/entities/test_case.json

@@ -8,6 +8,7 @@
     "status": { "type": "string" },
     "name": { "type": "string" },
     "classname": { "type": "string" },
+    "file": { "type": ["string", "null"] },
     "execution_time": { "type": "float" },
     "system_output": { "type": ["string", "null"] },
     "stack_trace":  { "type": ["string", "null"] },

spec/serializers/test_case_entity_spec.rb

@@ -19,6 +19,7 @@ RSpec.describe TestCaseEntity do
         expect(subject[:status]).to eq('success')
         expect(subject[:name]).to eq('Test#sum when a is 1 and b is 3 returns summary')
         expect(subject[:classname]).to eq('spec.test_spec')
+        expect(subject[:file]).to eq('./spec/test_spec.rb')
         expect(subject[:execution_time]).to eq(1.11)
       end
     end
@@ -30,6 +31,7 @@ RSpec.describe TestCaseEntity do
         expect(subject[:status]).to eq('failed')
         expect(subject[:name]).to eq('Test#sum when a is 1 and b is 3 returns summary')
         expect(subject[:classname]).to eq('spec.test_spec')
+        expect(subject[:file]).to eq('./spec/test_spec.rb')
         expect(subject[:execution_time]).to eq(2.22)
       end
     end