[test] Don't parse expected/actuals for very long messages

The default threshold is 10_000 characters but can be changed by using setting the `idea.expected.message.length.threshold` property key. #IDEA-347460 Fixed

GitOrigin-RevId: 2c5ab995aab90eed2be001a2962bb8a42e984a7a

java/java-runtime/src/com/intellij/rt/execution/testFrameworks/AbstractExpectedPatterns.java

@@ -1,18 +1,4 @@
-/*
- * Copyright 2000-2015 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+// Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package com.intellij.rt.execution.testFrameworks;
 
 import com.intellij.rt.execution.junit.ComparisonFailureData;
@@ -26,6 +12,14 @@ public class AbstractExpectedPatterns {
   private static final Pattern ASSERT_EQUALS_PATTERN = Pattern.compile("expected:<(.*)> but was:<(.*)>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE);
   private static final Pattern ASSERT_EQUALS_CHAINED_PATTERN = Pattern.compile("but was:<(.*)>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE);
 
+  /**
+   * System property to specify the maximum threshold for expected patterns.
+   * When the message length exceeds this threshold, we won't parse the message because running regex over such messages will be very slow.
+   */
+  public static final String MESSAGE_LENGTH_THRESHOLD_PROPERTY = "idea.expected.message.length.threshold";
+
+  public static final int DEFAULT_MESSAGE_LENGTH_THRESHOLD = 10_000;
+
   protected static void registerPatterns(String[] patternStrings, List<Pattern> patterns) {
     for (String string : patternStrings) {
       patterns.add(Pattern.compile(string, Pattern.DOTALL | Pattern.CASE_INSENSITIVE));
@@ -33,6 +27,7 @@ public class AbstractExpectedPatterns {
   }
 
   protected static ComparisonFailureData createExceptionNotification(String message, List<Pattern> patterns) {
+    if (exceedsMessageThreshold(message)) return null;
     ComparisonFailureData assertEqualsNotification = createExceptionNotification(message, ASSERT_EQUALS_PATTERN);
     if (assertEqualsNotification != null) {
       return ASSERT_EQUALS_CHAINED_PATTERN.matcher(assertEqualsNotification.getExpected()).find() ? null : assertEqualsNotification;
@@ -48,6 +43,7 @@ public class AbstractExpectedPatterns {
   }
 
   protected static ComparisonFailureData createExceptionNotification(String message, Pattern pattern) {
+    if (exceedsMessageThreshold(message)) return null;
     final Matcher matcher = pattern.matcher(message);
     if (matcher.find() && matcher.end() == message.length()) {
       return new ComparisonFailureData(matcher.group(1).replaceAll("\\\\n", "\n"), 
@@ -55,4 +51,30 @@ public class AbstractExpectedPatterns {
     }
     return null;
   }
+
+  /**
+   * @return whether the size of the message is too big to parse.
+   */
+  protected static boolean exceedsMessageThreshold(String message) {
+    return message.length() > getMessageThreshold();
+  }
+
+  private static int getMessageThreshold() {
+    int threshold = DEFAULT_MESSAGE_LENGTH_THRESHOLD;
+    try {
+      String property = System.getProperty(MESSAGE_LENGTH_THRESHOLD_PROPERTY);
+      if (property == null) property = System.getProperty("idea.junit.message.length.threshold"); // legacy property that was used for JUnit
+      if (property != null) {
+        try {
+          threshold = Integer.parseInt(property);
+        }
+        catch (NumberFormatException ignore) {
+        }
+      }
+      return threshold;
+    }
+    catch (SecurityException ignore) {
+    }
+    return threshold;
+  }
 }