From ef363d097d934c73f22b3b7e57795c83898ffc3d Mon Sep 17 00:00:00 2001
From: Miguel Fonseca <miguelcsf@gmail.com>
Date: Thu, 27 May 2021 13:25:48 +0100
Subject: [PATCH] Workflows: Performance: Honour `--wp-version` option

... by patching the temporary test environment's `.wp-env.json` config.

WIP add wpVersion option

finish perf.js
---
 bin/plugin/cli.js                  |  4 ++++
 bin/plugin/commands/performance.js | 17 +++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/bin/plugin/cli.js b/bin/plugin/cli.js
index e3a22ebd3d603c..5dbaac5d08e869 100755
--- a/bin/plugin/cli.js
+++ b/bin/plugin/cli.js
@@ -62,6 +62,10 @@ program
 		'--tests-branch <branch>',
 		"Use this branch's performance test files"
 	)
+	.option(
+		'--wp-version <version>',
+		'Specify a WordPress version on which to test all branches'
+	)
 	.description(
 		'Runs performance tests on two separate branches and outputs the result'
 	)
diff --git a/bin/plugin/commands/performance.js b/bin/plugin/commands/performance.js
index 1af84ef1208dec..dcf3706f32f27b 100644
--- a/bin/plugin/commands/performance.js
+++ b/bin/plugin/commands/performance.js
@@ -22,6 +22,7 @@ const config = require( '../config' );
  *
  * @property {boolean=} ci          Run on CI.
  * @property {string=}  testsBranch The branch whose performance test files will be used for testing.
+ * @property {string=}  wpVersion   The WordPress version to be used as the base install for testing.
  */
 
 /**
@@ -260,6 +261,22 @@ async function runPerformanceTests( branches, options ) {
 	);
 
 	log( '>> Starting the WordPress environment' );
+	if ( options.wpVersion ) {
+		// Patch the environment's .wp-env.json config to use the specified WP version:
+		//
+		//     {
+		//         "core": "https://wordpress.org/wordpress-$VERSION",
+		//         ...
+		//     }
+		//
+		// Only use the major version, i.e. 5.7.2 becomes 5.7.
+		const major = options.wpVersion.split( '.' ).slice( 0, 2 ).join( '.' );
+		const zipUrl = `https:\\/\\/wordpress.org\\/wordpress-${ major }.zip`;
+		log( `Using WordPress version ${ major }` );
+		await runShellScript(
+			`sed -I '' -e '/"core":/s/WordPress\\/WordPress/${ zipUrl }/' "${ environmentDirectory }/.wp-env.json"`
+		);
+	}
 	await runShellScript( 'npm run wp-env start', environmentDirectory );
 
 	const testSuites = [ 'post-editor', 'site-editor' ];