mock elastic-apm-node in @kbn/test jest preset

packages/kbn-test/jest-preset.js

@@ -28,6 +28,7 @@ module.exports = {
   moduleNameMapper: {
     '@elastic/eui/lib/(.*)?': '<rootDir>/node_modules/@elastic/eui/test-env/$1',
     '@elastic/eui$': '<rootDir>/node_modules/@elastic/eui/test-env',
+    'elastic-apm-node': '<rootDir>/node_modules/@kbn/test/target_node/jest/mocks/apm_agent_mock.js',
     '\\.module.(css|scss)$':
       '<rootDir>/node_modules/@kbn/test/target_node/jest/mocks/css_module_mock.js',
     '\\.(css|less|scss)$': '<rootDir>/node_modules/@kbn/test/target_node/jest/mocks/style_mock.js',

packages/kbn-test/src/jest/mocks/apm_agent_mock.js

@@ -0,0 +1,62 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+/**
+ * `elastic-apm-node` patches the runtime at import time
+ *  causing memory leak with jest module sandbox, so it
+ *  needs to be mocked for tests
+ */
+
+/* eslint-disable no-undef */
+const agent = {
+  start: jest.fn().mockImplementation(() => agent),
+  isStarted: jest.fn().mockReturnValue(false),
+  getServiceName: jest.fn().mockReturnValue('mock-service'),
+  setFramework: jest.fn(),
+  addPatch: jest.fn(),
+  removePatch: jest.fn(),
+  clearPatches: jest.fn(),
+  lambda: jest.fn(),
+  handleUncaughtExceptions: jest.fn(),
+  captureError: jest.fn(),
+  currentTraceparent: null,
+  currentTraceIds: {},
+  startTransaction: jest.fn().mockReturnValue(null),
+  setTransactionName: jest.fn(),
+  endTransaction: jest.fn(),
+  currentTransaction: null,
+  startSpan: jest.fn(),
+  currentSpan: null,
+  setLabel: jest.fn().mockReturnValue(false),
+  addLabels: jest.fn().mockReturnValue(false),
+  setUserContext: jest.fn(),
+  setCustomContext: jest.fn(),
+  addFilter: jest.fn(),
+  addErrorFilter: jest.fn(),
+  addSpanFilter: jest.fn(),
+  addTransactionFilter: jest.fn(),
+  addMetadataFilter: jest.fn(),
+  flush: jest.fn(),
+  destroy: jest.fn(),
+  registerMetric: jest.fn(),
+  setTransactionOutcome: jest.fn(),
+  setSpanOutcome: jest.fn(),
+  middleware: {
+    connect: jest.fn().mockReturnValue(jest.fn()),
+  },
+  logger: {
+    fatal: jest.fn(),
+    error: jest.fn(),
+    warn: jest.fn(),
+    info: jest.fn(),
+    debug: jest.fn(),
+    trace: jest.fn(),
+  },
+};
+
+module.exports = agent;