feat: add internal/testing-only opts._elasticApm to facilitate APM agent tests (#84)

Author: trentm

loggers/pino/CHANGELOG.md

@@ -1,5 +1,13 @@
 # @elastic/ecs-pino-format Changelog
 
+## v1.2.0
+
+- Add an *internal testing-only* option (`opts._elasticApm`) to pass in the
+  current loaded "elastic-apm-node" module for use in APM tracing integration.
+  This option will be used by tests in the APM agent where the current agent
+  import name is a local path rather than "elastic-apm-node" that this code
+  normally uses.
+
 ## v1.1.2
 
 - Fix a circular-require for code that uses both this package and

loggers/pino/index.js

@@ -65,7 +65,13 @@ function createEcsPinoOptions (opts) {
   let apm = null
   let apmServiceName = null
   if (apmIntegration) {
-    if (!triedElasticApmImport) {
+    // istanbul ignore if
+    if (opts && opts._elasticApm) {
+      // `opts._elasticApm` is an internal/testing-only option to be used
+      // for testing in the APM agent where the import is a local path
+      // rather than "elastic-apm-node".
+      elasticApm = opts._elasticApm
+    } else if (!triedElasticApmImport) {
       triedElasticApmImport = true
       // We lazily require this module here instead of at the top-level to
       // avoid a possible circular-require if the user code does

loggers/pino/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@elastic/ecs-pino-format",
-  "version": "1.1.2",
+  "version": "1.2.0",
   "description": "A formatter for the pino logger compatible with Elastic Common Schema.",
   "main": "index.js",
   "files": [