tools: improve output for unexpected passes in WTP tests

PR-URL: #62587
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: aduh95

test/common/wpt.js

@@ -806,13 +806,14 @@ class WPTRunner {
 }
 
 // Full check: every expected to fail test is present
-if(specs.failedTests.some((expectedToFail)=>{
+const_unexpectedPasses=specs.failedTests.filter((expectedToFail)=>{
 if(specs.flakyTests.includes(expectedToFail)){
 returnfalse;
 }
 returnthis.results[key]?.fail?.expected?.includes(expectedToFail)!==true;
-})){
-unexpectedPasses.push(key);
+});
+if(_unexpectedPasses.length){
+unexpectedPasses.push(..._unexpectedPasses.map((name)=>`${key}:${name}`));
 continue;
 }
 }