From 356e93d69a1a9c294e52ff1f28a5347becf38de2 Mon Sep 17 00:00:00 2001
From: Michael Dawson <michael_dawson@ca.ibm.com>
Date: Thu, 26 Nov 2020 18:08:41 -0500
Subject: [PATCH] test: fixup testing for specific N-API version (#840)

Fixup testing for a specific N-API version
and document.

Reviewed-By: NickNaso <nicoladelgobbo@gmail.com>
PR-URL: https://github.com/nodejs/node-addon-api/pull/840
---
 README.md     |  9 +++++++++
 test/index.js | 10 +++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 8e7ee391d..41935336d 100644
--- a/README.md
+++ b/README.md
@@ -157,6 +157,15 @@ npm install
 npm test --disable-deprecated
 ```
 
+To run the tests targetting a specific version of N-API run
+```
+npm install
+export NAPI_VERSION=X
+npm test --NAPI_VERSION=X
+```
+
+where X is the version of N-API you want to target.
+
 ### **Debug**
 
 To run the **node-addon-api** tests with `--debug` option:
diff --git a/test/index.js b/test/index.js
index ac95d88aa..ece32b3b4 100644
--- a/test/index.js
+++ b/test/index.js
@@ -62,7 +62,15 @@ let testModules = [
   'version_management'
 ];
 
-const napiVersion = Number(process.versions.napi)
+let napiVersion = Number(process.versions.napi)
+if (process.env.NAPI_VERSION) {
+  // we need this so that we don't try run tests that rely
+  // on methods that are not available in the NAPI_VERSION
+  // specified
+  napiVersion = process.env.NAPI_VERSION;
+}
+console.log('napiVersion:' + napiVersion);
+
 const majorNodeVersion = process.versions.node.split('.')[0]
 
 if (napiVersion < 3) {