Set assumed locale for HelpTest

Otherwise the test would fail on machines with other default than EN.

spring-shell-standard-commands/src/test/java/org/springframework/shell/standard/commands/HelpTest.java

@@ -22,9 +22,12 @@ import java.io.InputStreamReader;
 import java.lang.reflect.Method;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.Locale;
 import java.util.Map;
 
 import org.assertj.core.api.Assertions;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TestName;
@@ -58,6 +61,19 @@ import javax.validation.constraints.Max;
 @ContextConfiguration(classes = HelpTest.Config.class)
 public class HelpTest {
 
+	private static Locale previousLocale;
+
+	@BeforeClass
+	public static void setAssumedLocale() {
+		previousLocale = Locale.getDefault();
+		Locale.setDefault(Locale.ENGLISH);
+	}
+
+	@AfterClass
+	public static void restorePreviousLocale() {
+		Locale.setDefault(previousLocale);
+	}
+
 	@Autowired
 	private Help help;