Set and reset Locale to pass test for non-english contributor. (#2622)

Fixes #2621

Co-authored-by: Paul Dingemans <paul-dingemans@users.noreply.github.com>

ktlint-cli-reporter-baseline/src/test/kotlin/com/pinterest/ktlint/cli/reporter/baseline/BaselineTest.kt

@@ -12,6 +12,8 @@ import io.github.oshai.kotlinlogging.KotlinLogging
 import nl.altindag.log.LogCaptor
 import org.assertj.core.api.Assertions.assertThat
 import org.assertj.core.api.Assertions.assertThatExceptionOfType
+import org.junit.jupiter.api.AfterEach
+import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Nested
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.io.TempDir
@@ -20,6 +22,7 @@ import org.junit.jupiter.params.provider.EnumSource
 import org.xml.sax.SAXParseException
 import java.nio.file.Path
 import java.nio.file.Paths
+import java.util.Locale
 import kotlin.io.path.Path
 import kotlin.io.path.copyTo
 import kotlin.io.path.pathString
@@ -43,6 +46,17 @@ private fun KLogger.underlyingLogger(): Logger? =
         ?.underlyingLogger
 
 class BaselineTest {
+    private val currentLocale = Locale.getDefault()
+
+    @BeforeEach
+    fun setLocaleEnglish() {
+        // SAXParseException messages are localized. Prevent tests from failing when run on a system for which local is not set to English.
+        Locale.setDefault(Locale.ENGLISH)
+    }
+
+    @AfterEach
+    fun resetLocaleDefault() = Locale.setDefault(currentLocale)
+
     @Nested
     inner class `Given a valid baseline file` {
         @Test