[SPARK-48490][CORE][TESTS][FOLLOWUP] Add some UT for the Windows paths scene

common/utils/src/test/scala/org/apache/spark/util/PatternLoggingSuite.scala

@@ -42,6 +42,11 @@ class PatternLoggingSuite extends LoggingSuiteBase with BeforeAndAfterAll {
     s""".*$level $className: This is a log message\nThis is a new line \t other msg\n"""
   }
 
+  override def expectedPatternForMsgWithMDCAndEscapeChar(level: Level): String = {
+    s""".*$level $className: The first message\nthe first new line\tthe first other msg\n""" +
+      s"""[\\s\\S]*The second message\nthe second new line\tthe second other msg\n"""
+  }
+
   override def expectedPatternForBasicMsgWithException(level: Level): String = {
     s""".*$level $className: This is a log message\n[\\s\\S]*"""
   }

common/utils/src/test/scala/org/apache/spark/util/StructuredLoggingSuite.scala

@@ -58,6 +58,11 @@ trait LoggingSuiteBase
   def basicMsgWithEscapeCharMDC: LogEntry =
     log"This is a log message\nThis is a new line \t other msg"
 
+  // scalastyle:off line.size.limit
+  def msgWithMDCAndEscapeChar: LogEntry =
+    log"The first message\nthe first new line\tthe first other msg\n${MDC(LogKeys.PATHS, "C:\\Users\\run-all_1.R\nC:\\Users\\run-all_2.R")}\nThe second message\nthe second new line\tthe second other msg"
+  // scalastyle:on line.size.limit
+
   def msgWithMDC: LogEntry = log"Lost executor ${MDC(LogKeys.EXECUTOR_ID, "1")}."
 
   def msgWithMDCValueIsNull: LogEntry = log"Lost executor ${MDC(LogKeys.EXECUTOR_ID, null)}."
@@ -77,6 +82,9 @@ trait LoggingSuiteBase
   // test for basic message (with escape char mdc)
   def expectedPatternForBasicMsgWithEscapeCharMDC(level: Level): String
 
+  // test for message (with mdc and escape char)
+  def expectedPatternForMsgWithMDCAndEscapeChar(level: Level): String
+
   // test for basic message and exception
   def expectedPatternForBasicMsgWithException(level: Level): String
 
@@ -130,6 +138,19 @@ trait LoggingSuiteBase
     }
   }
 
+  test("Logging with MDC and escape char") {
+    Seq(
+      (Level.ERROR, () => logError(msgWithMDCAndEscapeChar)),
+      (Level.WARN, () => logWarning(msgWithMDCAndEscapeChar)),
+      (Level.INFO, () => logInfo(msgWithMDCAndEscapeChar)),
+      (Level.DEBUG, () => logDebug(msgWithMDCAndEscapeChar)),
+      (Level.TRACE, () => logTrace(msgWithMDCAndEscapeChar))
+    ).foreach { case (level, logFunc) =>
+      val logOutput = captureLogOutput(logFunc)
+      assert(expectedPatternForMsgWithMDCAndEscapeChar(level).r.matches(logOutput))
+    }
+  }
+
   test("Basic logging with Exception") {
     val exception = new RuntimeException("OOM")
     Seq(
@@ -218,6 +239,7 @@ class StructuredLoggingSuite extends LoggingSuiteBase {
     jsonMapper.readTree(json).toString.
       replace("<timestamp>", """[^"]+""").
       replace(""""<stacktrace>"""", """.*""").
+      replace("<windows_paths>", """.*""").
       replace("{", """\{""") + "\n"
   }
 
@@ -254,6 +276,22 @@ class StructuredLoggingSuite extends LoggingSuiteBase {
         }""")
   }
 
+  override def expectedPatternForMsgWithMDCAndEscapeChar(level: Level): String = {
+    // scalastyle:off line.size.limit
+    compactAndToRegexPattern(
+    s"""
+      {
+         "ts": "<timestamp>",
+         "level": "$level",
+         "msg": "The first message\\\\nthe first new line\\\\tthe first other msg\\\\n<windows_paths>\\\\nThe second message\\\\nthe second new line\\\\tthe second other msg",
+         "context": {
+           "paths": "<windows_paths>"
+         },
+         "logger": "$className"
+      }""")
+    // scalastyle:on line.size.limit
+  }
+
   override def expectedPatternForBasicMsgWithException(level: Level): String = {
     compactAndToRegexPattern(
       s"""