Add a parent class for locale aware tests

javaxval/src/test/java/org/baeldung/javaxval/LocaleAwareUnitTest.java

@@ -0,0 +1,23 @@
+package org.baeldung.javaxval;
+
+import java.util.Locale;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+
+public abstract class LocaleAwareUnitTest {
+    private static Locale previousDefault;
+
+    @BeforeClass
+    public static void setupLocale() {
+        previousDefault = Locale.getDefault();
+
+        Locale.setDefault(Locale.US);
+    }
+
+    @AfterClass
+    public static void resetLocale() {
+        Locale.setDefault(previousDefault);
+    }
+
+}

javaxval/src/test/java/org/baeldung/javaxval/bigdecimal/InvoiceUnitTest.java

@@ -3,24 +3,22 @@ package org.baeldung.javaxval.bigdecimal;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import java.math.BigDecimal;
-import java.util.Locale;
 import java.util.Set;
 
 import javax.validation.ConstraintViolation;
 import javax.validation.Validation;
 import javax.validation.Validator;
 
+import org.baeldung.javaxval.LocaleAwareUnitTest;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
-public class InvoiceUnitTest {
+public class InvoiceUnitTest extends LocaleAwareUnitTest {
 
     private static Validator validator;
 
     @BeforeClass
     public static void setupValidatorInstance() {
-        Locale.setDefault(Locale.US);
-
         validator = Validation.buildDefaultValidatorFactory()
             .getValidator();
     }

javaxval/src/test/java/org/baeldung/javaxval/container/validation/ContainerValidationIntegrationTest.java

@@ -11,9 +11,6 @@ import javax.validation.Validation;
 import javax.validation.Validator;
 import javax.validation.ValidatorFactory;
 
-import org.baeldung.javaxval.container.validation.Customer;
-import org.baeldung.javaxval.container.validation.CustomerMap;
-import org.baeldung.javaxval.container.validation.Profile;
 import org.baeldung.javaxval.container.validation.valueextractors.ProfileValueExtractor;
 import org.junit.Before;
 import org.junit.Test;

javaxval/src/test/java/org/baeldung/javaxval/validationgroup/RegistrationFormUnitTest.java

@@ -2,23 +2,21 @@ package org.baeldung.javaxval.validationgroup;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-import java.util.Locale;
 import java.util.Set;
 
 import javax.validation.ConstraintViolation;
 import javax.validation.Validation;
 import javax.validation.Validator;
 
+import org.baeldung.javaxval.LocaleAwareUnitTest;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
-public class RegistrationFormUnitTest {
+public class RegistrationFormUnitTest extends LocaleAwareUnitTest {
     private static Validator validator;
 
     @BeforeClass
     public static void setupValidatorInstance() {
-        Locale.setDefault(Locale.US);
-
         validator = Validation.buildDefaultValidatorFactory()
             .getValidator();
     }