diff --git a/packages/kbn-test/package.json b/packages/kbn-test/package.json
index 0cc54fa2a64c41..a01c4ebab8ad08 100644
--- a/packages/kbn-test/package.json
+++ b/packages/kbn-test/package.json
@@ -5,7 +5,7 @@
   "license": "Apache-2.0",
   "private": true,
   "scripts": {
-    "build": "babel src --out-dir target --delete-dir-on-start --extensions .ts,.js,.tsx --ignore *.test.js,**/__tests__/**",
+    "build": "babel src --out-dir target --delete-dir-on-start --extensions .ts,.js,.tsx --ignore *.test.js,**/__tests__/** --source-maps=inline",
     "kbn:bootstrap": "yarn build",
     "kbn:watch": "yarn build --watch"
   },
diff --git a/packages/kbn-test/src/failed_tests_reporter/test_report.ts b/packages/kbn-test/src/failed_tests_reporter/test_report.ts
index 6b759ef1d4c626..43d84163462d3a 100644
--- a/packages/kbn-test/src/failed_tests_reporter/test_report.ts
+++ b/packages/kbn-test/src/failed_tests_reporter/test_report.ts
@@ -47,7 +47,7 @@ export interface TestSuite {
     /* number of skipped tests as a string */
     skipped: string;
   };
-  testcase: TestCase[];
+  testcase?: TestCase[];
 }
 
 export interface TestCase {
@@ -89,7 +89,7 @@ export function* makeTestCaseIter(report: TestReport) {
   const testSuites = 'testsuites' in report ? report.testsuites.testsuite : [report.testsuite];
 
   for (const testSuite of testSuites) {
-    for (const testCase of testSuite.testcase) {
+    for (const testCase of testSuite.testcase || []) {
       yield testCase;
     }
   }