test: test for minimum ICU version consistency

The minimum ICU version for Node.js must be at least the minimum ICU
version for V8.
PR-URL: #30608
Refs: #30607
Reviewed-By: Steven R Loomis <srloomis@us.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: richardlau

test/parallel/test-icu-minimum-version.js

@@ -0,0 +1,20 @@
+'use strict';
+
+// Tests that the minimum ICU version for Node.js is at least the minimum ICU
+// version for V8.
+
+require('../common');
+constassert=require('assert');
+constpath=require('path');
+const{ readFileSync }=require('fs');
+
+constsrcRoot=path.join(__dirname,'..','..');
+consticuVersionsFile=path.join(srcRoot,'tools','icu','icu_versions.json');
+const{minimum_icu: minimumICU}=require(icuVersionsFile);
+constv8SrcFile=path.join(srcRoot,
+'deps','v8','src','objects','intl-objects.h');
+constv8Src=readFileSync(v8SrcFile,{encoding: 'utf8'});
+constv8MinimumICU=v8Src.match(/#define\s+V8_MINIMUM_ICU_VERSION\s+(\d+)/)[1];
+assert.ok(minimumICU>=Number(v8MinimumICU),
+`minimum ICU version in ${icuVersionsFile} (${minimumICU}) `+
+`must be at least that in ${v8SrcFile} (${Number(v8MinimumICU)})`);