message: Fix the unit test report collection
diff: @@ -198,7 +198,8 @@ def buildDiffCoverage() {
  -D REALM_COVERAGE=ON \\
  -G Ninja ..
  ninja
  - test/realm-tests
  + cd test
  + ./realm-tests
  mkdir coverage
  diff-cover gcovr.xml \\
  --compare-branch=origin/${env.CHANGE_TARGET} \\
  @@ -277,10 +278,10 @@ def doBuildAppleDevice(String sdk, String buildType) {
  }
  def recordTests(tag) {
  - def tests = readFile('test/unit-test-report.xml')
  + def tests = readFile('build-dir/test/unit-test-report.xml')
  def modifiedTests = tests.replaceAll('realm-core-tests', tag)
  - writeFile file: 'test/modified-test-report.xml', text: modifiedTests
  - junit 'test/modified-test-report.xml'
  + writeFile file: 'build-dir/test/modified-test-report.xml', text: modifiedTests
  + junit 'build-dir/test/modified-test-report.xml'
  }
  def collectCompilerWarnings(compiler, fail) {
  