From f521c43b07485665ac09a671bb4613116c3be5b4 Mon Sep 17 00:00:00 2001
From: Sharang Gupta <sharang@sharanggupta.dev>
Date: Tue, 6 Oct 2026 23:07:41 +0100
Subject: [PATCH] test: pin the default locale in SpringDocApp238Test

SpringDocApp238Test resolves the @Info title and the tag names through a
ResourceBundleMessageSource for en-US, fr-CA and zh-CN and compares the
output with fixtures written for the base messages.properties bundle.
ResourceBundleMessageSource falls back to the JVM default locale before
the base bundle, so on a machine whose default locale is en_GB the en-US
request (and the zh-CN one, which the allowed-locales setting maps to
en-US) picks up messages_en_GB.properties and the test fails with
"This is a test message[EN_GB]".

Pin the default locale to en-US for the duration of the class and
restore it afterwards, as SpringDocApp14Test already does, so the
fixtures are deterministic regardless of the host locale.

Fixes #3379
---
 .../api/v30/app238/SpringDocApp238Test.java       | 15 +++++++++++++++
 .../api/v31/app238/SpringDocApp238Test.java       | 15 +++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app238/SpringDocApp238Test.java b/springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app238/SpringDocApp238Test.java
index 1c1cfbc05..256944b53 100644
--- a/springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app238/SpringDocApp238Test.java
+++ b/springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app238/SpringDocApp238Test.java
@@ -26,6 +26,8 @@
 
 import java.util.Locale;
 
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.springdoc.core.customizers.OpenApiLocaleCustomizer;
 import org.springdoc.core.utils.Constants;
@@ -48,6 +50,19 @@
 @TestPropertySource(properties = "springdoc.allowed-locales=en-US,fr-CA")
 public class SpringDocApp238Test extends AbstractSpringDocV30Test {
 
+	private static Locale DEFAULT_LOCALE;
+
+	@BeforeAll
+	public static void init() {
+		DEFAULT_LOCALE = Locale.getDefault();
+		Locale.setDefault(Locale.US);
+	}
+
+	@AfterAll
+	public static void clean() {
+		Locale.setDefault(DEFAULT_LOCALE);
+	}
+
 	@Test
 	@Override
 	public void testApp() throws Exception {
diff --git a/springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v31/app238/SpringDocApp238Test.java b/springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v31/app238/SpringDocApp238Test.java
index a681556ae..cd349dd01 100644
--- a/springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v31/app238/SpringDocApp238Test.java
+++ b/springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v31/app238/SpringDocApp238Test.java
@@ -26,6 +26,8 @@
 
 import java.util.Locale;
 
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.springdoc.core.customizers.OpenApiLocaleCustomizer;
 import org.springdoc.core.utils.Constants;
@@ -48,6 +50,19 @@
 @TestPropertySource(properties = "springdoc.allowed-locales=en-US,fr-CA")
 public class SpringDocApp238Test extends AbstractSpringDocTest {
 
+	private static Locale DEFAULT_LOCALE;
+
+	@BeforeAll
+	public static void init() {
+		DEFAULT_LOCALE = Locale.getDefault();
+		Locale.setDefault(Locale.US);
+	}
+
+	@AfterAll
+	public static void clean() {
+		Locale.setDefault(DEFAULT_LOCALE);
+	}
+
 	@Test
 	@Override
 	public void testApp() throws Exception {