[jest/junit] fix junit reporter (#32686)

Fixes https://github.com/elastic/kibana/issues/32619

With #31825 the reporter contract changed slightly and this updates our custom reporter to fix our junit reports.

src/dev/jest/integration_tests/__fixtures__/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "fixture",
+  "jest": {
+    "testMatch": [
+      "**/test.js"
+    ],
+    "transform": {
+      "^.+\\.js$": "<rootDir>/../../babel_transform.js"
+    },
+    "reporters": [
+      ["<rootDir>/../../junit_reporter.js", {"rootDirectory": "."}]
+    ]
+  }
+}

src/dev/jest/integration_tests/__fixtures__/test.js

@@ -0,0 +1,22 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+it('fails', () => {
+  throw new Error('failure');
+});

src/dev/jest/integration_tests/junit_reporter.test.js

@@ -0,0 +1,94 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { resolve } from 'path';
+import { promisify } from 'util';
+import { readFileSync } from 'fs';
+
+import del from 'del';
+import execa from 'execa';
+import xml2js from 'xml2js';
+
+const MINUTE = 1000 * 60;
+const ROOT_DIR = resolve(__dirname, '../../../../');
+const FIXTURE_DIR = resolve(__dirname, '__fixtures__');
+const TARGET_DIR = resolve(FIXTURE_DIR, 'target');
+const XML_PATH = resolve(TARGET_DIR, 'junit/TEST-Jest Tests.xml');
+
+afterAll(async () => {
+  await del(TARGET_DIR);
+});
+
+const parseXml = promisify(xml2js.parseString);
+
+it(
+  'produces a valid junit report for failures',
+  async () => {
+    const result = await execa(
+      process.execPath,
+      ['-r', require.resolve('../../../setup_node_env'), require.resolve('jest/bin/jest')],
+      {
+        cwd: FIXTURE_DIR,
+        env: {
+          CI: 'true',
+        },
+        reject: false,
+      }
+    );
+
+    expect(result.code).toBe(1);
+    await expect(parseXml(readFileSync(XML_PATH, 'utf8'))).resolves.toEqual({
+      testsuites: {
+        $: {
+          name: 'jest',
+          skipped: '0',
+          tests: '1',
+          time: expect.anything(),
+          timestamp: expect.anything(),
+        },
+        testsuite: [
+          {
+            $: {
+              failures: '1',
+              file: resolve(ROOT_DIR, 'src/dev/jest/integration_tests/__fixtures__/test.js'),
+              name: 'test.js',
+              skipped: '0',
+              tests: '1',
+              time: expect.anything(),
+              timestamp: expect.anything(),
+            },
+            testcase: [
+              {
+                $: {
+                  classname: 'Jest Tests.·',
+                  name: 'fails',
+                  time: expect.anything()
+                },
+                failure: [
+                  expect.stringMatching(/Error: failure\s+at /m)
+                ]
+              }
+            ]
+          }
+        ]
+      }
+    });
+  },
+  3 * MINUTE
+);

src/dev/jest/junit_reporter.js

@@ -39,7 +39,7 @@ export default class JestJUnitReporter {
     } = options;
 
     this._reportName = reportName;
-    this._rootDirectory = rootDirectory;
+    this._rootDirectory = resolve(rootDirectory);
   }
 
   /**
@@ -70,7 +70,7 @@ export default class JestJUnitReporter {
       timestamp: msToIso(results.startTime),
       time: msToSec(Date.now() - results.startTime),
       tests: results.numTotalTests,
-      failures: results.numFailedTests,
+      failures: results.numFailingTests,
       skipped: results.numPendingTests,
     });
 
@@ -81,7 +81,7 @@ export default class JestJUnitReporter {
         timestamp: msToIso(suite.perfStats.start),
         time: msToSec(suite.perfStats.end - suite.perfStats.start),
         tests: suite.testResults.length,
-        failures: suite.numFailedTests,
+        failures: suite.numFailingTests,
         skipped: suite.numPendingTests,
         file: suite.testFilePath
       });