test: add whatwg-encoding TextDecoder custom inspection with showHidden

These tests ensure hidden fields are shown when inspecting with `showHidden` and that passing negative `depth` prints simplified value. Co-authored-by: Robin Drexler <[email protected]> PR-URL: #24166 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Daijiro Wachi <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: 2 people

test/parallel/test-whatwg-encoding-textdecoder.js

@@ -6,6 +6,7 @@ const common = require('../common');
 constassert=require('assert');
 const{ TextDecoder, TextEncoder }=require('util');
 const{customInspectSymbol: inspect}=require('internal/util');
+constutil=require('util');
 
 constbuf=Buffer.from([0xef,0xbb,0xbf,0x74,0x65,
 0x73,0x74,0xe2,0x82,0xac]);
@@ -98,6 +99,42 @@ if (common.hasIntl){
 assert.strictEqual(res,'test€');
 }
 
+// Test TextDecoder inspect with hidden fields
+{
+constdec=newTextDecoder('utf-8',{ignoreBOM: true});
+if(common.hasIntl){
+assert.strictEqual(
+util.inspect(dec,{showHidden: true}),
+'TextDecoder{\n encoding: \'utf-8\',\n fatal: false,\n '+
+'ignoreBOM: true,\n [Symbol(flags)]: 4,\n [Symbol(handle)]:{} }'
+);
+}else{
+assert.strictEqual(
+util.inspect(dec,{showHidden: true}),
+'TextDecoder{\n encoding: \'utf-8\',\n fatal: false,\n '+
+'ignoreBOM: true,\n [Symbol(flags)]: 4,\n [Symbol(handle)]:\n '+
+'StringDecoder{\n encoding: \'utf8\',\n '+
+'[Symbol(kNativeDecoder)]: <Buffer 00 00 00 00 00 00 01>} }'
+);
+}
+}
+
+
+// Test TextDecoder inspect without hidden fields
+{
+constdec=newTextDecoder('utf-8',{ignoreBOM: true});
+assert.strictEqual(
+util.inspect(dec,{showHidden: false}),
+'TextDecoder{encoding: \'utf-8\', fatal: false, ignoreBOM: true }'
+);
+}
+
+// Test TextDecoder inspect with negative depth
+{
+constdec=newTextDecoder();
+assert.strictEqual(util.inspect(dec,{depth: -1}),'[Object]');
+}
+
 {
 constinspectFn=TextDecoder.prototype[inspect];
 constdecodeFn=TextDecoder.prototype.decode;