Add tests with old reserved syntax as syntax-error tests

icu4c/source/test/intltest/messageformat2test_read_json.cpp

@@ -303,6 +303,8 @@ void TestMessageFormat2::jsonTestsFromFiles(IcuTestErrorCode& errorCode) {
     // Do tests for reserved statements/expressions
     runTestsFromJsonFile(*this, "spec/unsupported-expressions.json", errorCode);
     runTestsFromJsonFile(*this, "spec/unsupported-statements.json", errorCode);
+    // Uncomment when reserved syntax is removed
+    // runTestsFromJsonFile(*this, "reserved-syntax-2.json", errorCode);
 
     // Do valid spec tests
     runTestsFromJsonFile(*this, "spec/syntax.json", errorCode);

testdata/message2/reserved-syntax-2.json

@@ -1,12 +1,21 @@
 {
   "scenario": "Reserved and private annotations",
-  "description": "Tests for unsupported expressions (reserved/private) - ICU4J only. Remove this file when error handling is reconciled",
+  "description": "Tests for old unsupported expression (reserved/private) syntax -- these are now syntax errors",
   "defaultTestProperties": {
-    "locale": "en-US"
+    "locale": "en-US",
+    "expErrors": [
+        {
+        "type": "syntax-error"
+      }
+    ]
   },
   "tests": [
-      { "src" : "\\\\{   ?   󗟋   𫓜|@}   |}", "ignoreCpp": "This would be an error in ICU4C" },
-      { "src" : "\\\\{   ?   󗟋   𫓜|@}   |   \\}   @𠟅򑚎𥪙𽧫=||   @򒘒򳷦㥞򉊷=$򸚶񽱆񅗽񤕞   @𰺱:񎫛񢶛򶈎񄮒}", "ignoreCpp": "This would be an error in ICU4C" }
+      { "src" : "\\\\{   ?   󗟋   𫓜|@}   |}" },
+      { "src" : "\\\\{   ?   󗟋   𫓜|@}   |   \\}   @𠟅򑚎𥪙𽧫=||   @򒘒򳷦㥞򉊷=$򸚶񽱆񅗽񤕞   @𰺱:񎫛񢶛򶈎񄮒}" },
+      { "src" : "{  $iFN  ^  @USh  =$u  @l}" },
+      { "src" : ".local $dS ={ $p4 ^ |.| \\\\ @g:FV = $kd}{{@}}" },
+      { "src" : ".D. \\\\ ||{1}{{}} " },
+      { "src" : ".cIT  ||{|@|  %  \\}  }  {  *󔜫񥘃󸇀  }{{}}" }
   ]
 }