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>

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');
+const assert = require('assert');
+const path = require('path');
+const { readFileSync } = require('fs');
+
+const srcRoot = path.join(__dirname, '..', '..');
+const icuVersionsFile = path.join(srcRoot, 'tools', 'icu', 'icu_versions.json');
+const { minimum_icu: minimumICU } = require(icuVersionsFile);
+const v8SrcFile = path.join(srcRoot,
+                            'deps', 'v8', 'src', 'objects', 'intl-objects.h');
+const v8Src = readFileSync(v8SrcFile, { encoding: 'utf8' });
+const v8MinimumICU = 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)})`);