[code coverage] adding plugin to flush coverage data (#83447)

* [test/common] adding code coverage plugin

* start plugin only when CODE_COVERAGE flag is set

* build coverage plugin

* replace casting with custom Window interface

test/common/config.js

@@ -61,6 +61,10 @@ export default function () {
         `--plugin-path=${path.join(__dirname, 'fixtures', 'plugins', 'newsfeed')}`,
         `--newsfeed.service.urlRoot=${servers.kibana.protocol}://${servers.kibana.hostname}:${servers.kibana.port}`,
         `--newsfeed.service.pathTemplate=/api/_newsfeed-FTS-external-service-simulators/kibana/v{VERSION}.json`,
+        // code coverage reporting plugin
+        ...(!!process.env.CODE_COVERAGE
+          ? [`--plugin-path=${path.join(__dirname, 'fixtures', 'plugins', 'coverage')}`]
+          : []),
       ],
     },
     services,

test/common/fixtures/plugins/coverage/kibana.json

@@ -0,0 +1,6 @@
+{
+  "id": "coverage-fixtures",
+  "version": "kibana",
+  "server": false,
+  "ui": true
+}

test/common/fixtures/plugins/coverage/public/index.ts

@@ -0,0 +1,24 @@
+/*
+ * 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 { CodeCoverageReportingPlugin } from './plugin';
+
+export function plugin() {
+  return new CodeCoverageReportingPlugin();
+}

test/common/fixtures/plugins/coverage/public/plugin.ts

@@ -0,0 +1,43 @@
+/*
+ * 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 { Plugin } from 'kibana/server';
+
+declare global {
+  interface Window {
+    __coverage__: any;
+    flushCoverageToLog: any;
+  }
+}
+
+export class CodeCoverageReportingPlugin implements Plugin {
+  constructor() {}
+
+  public start() {}
+
+  public setup() {
+    window.flushCoverageToLog = function () {
+      if (window.__coverage__) {
+        // eslint-disable-next-line no-console
+        console.log('coveragejson:' + btoa(JSON.stringify(window.__coverage__)));
+      }
+    };
+    window.addEventListener('beforeunload', window.flushCoverageToLog);
+  }
+}

test/scripts/jenkins_build_plugins.sh

@@ -7,5 +7,6 @@ node scripts/build_kibana_platform_plugins \
   --oss \
   --scan-dir "$KIBANA_DIR/test/plugin_functional/plugins" \
   --scan-dir "$KIBANA_DIR/test/interpreter_functional/plugins" \
+  --scan-dir "$KIBANA_DIR/test/common/fixtures/plugins" \
   --workers 6 \
   --verbose

test/scripts/jenkins_xpack_build_plugins.sh

@@ -5,6 +5,7 @@ source src/dev/ci_setup/setup_env.sh
 echo " -> building kibana platform plugins"
 node scripts/build_kibana_platform_plugins \
   --scan-dir "$KIBANA_DIR/test/plugin_functional/plugins" \
+  --scan-dir "$KIBANA_DIR/test/common/fixtures/plugins" \
   --scan-dir "$XPACK_DIR/test/plugin_functional/plugins" \
   --scan-dir "$XPACK_DIR/test/functional_with_es_ssl/fixtures/plugins" \
   --scan-dir "$XPACK_DIR/test/alerting_api_integration/plugins" \