Replace Locale.ENGLISH with Locale.ROOT in tests
diff --git a/src/test/java/org/apache/commons/configuration2/builder/combined/TestFileExtensionConfigurationBuilderProvider.java b/src/test/java/org/apache/commons/configuration2/builder/combined/TestFileExtensionConfigurationBuilderProvider.java
index 15c5b92..e309cfa 100644
--- a/src/test/java/org/apache/commons/configuration2/builder/combined/TestFileExtensionConfigurationBuilderProvider.java
+++ b/src/test/java/org/apache/commons/configuration2/builder/combined/TestFileExtensionConfigurationBuilderProvider.java
@@ -92,7 +92,7 @@
     @Test
     public void testDetermineConfigurationClassMatchCase() throws ConfigurationException {
         final ConfigurationDeclaration decl = setUpDecl();
-        final BuilderParameters params = new FileBasedBuilderParametersImpl().setPath("C:\\Test\\someTestConfiguration." + EXT.toUpperCase(Locale.ENGLISH));
+        final BuilderParameters params = new FileBasedBuilderParametersImpl().setPath("C:\\Test\\someTestConfiguration." + EXT.toUpperCase(Locale.ROOT));
         final FileExtensionConfigurationBuilderProvider provider = setUpProvider();
         assertEquals(MATCH_CLASS, provider.determineConfigurationClass(decl, Collections.singleton(params)));
     }
diff --git a/src/test/java/org/apache/commons/configuration2/tree/TestNodeNameMatchers.java b/src/test/java/org/apache/commons/configuration2/tree/TestNodeNameMatchers.java
index d418205..5fcc56d 100644
--- a/src/test/java/org/apache/commons/configuration2/tree/TestNodeNameMatchers.java
+++ b/src/test/java/org/apache/commons/configuration2/tree/TestNodeNameMatchers.java
@@ -67,8 +67,8 @@
     public void testEqualsIgnoreCaseMatch() {
         final ImmutableNode node = createNode(NODE_NAME);
         assertTrue(NodeNameMatchers.EQUALS_IGNORE_CASE.matches(node, handler, NODE_NAME));
-        assertTrue(NodeNameMatchers.EQUALS_IGNORE_CASE.matches(node, handler, NODE_NAME.toLowerCase(Locale.ENGLISH)));
-        assertTrue(NodeNameMatchers.EQUALS_IGNORE_CASE.matches(node, handler, NODE_NAME.toUpperCase(Locale.ENGLISH)));
+        assertTrue(NodeNameMatchers.EQUALS_IGNORE_CASE.matches(node, handler, NODE_NAME.toLowerCase(Locale.ROOT)));
+        assertTrue(NodeNameMatchers.EQUALS_IGNORE_CASE.matches(node, handler, NODE_NAME.toUpperCase(Locale.ROOT)));
     }
 
     /**
diff --git a/src/test/java/org/apache/commons/configuration2/tree/xpath/TestConfigurationAttributePointer.java b/src/test/java/org/apache/commons/configuration2/tree/xpath/TestConfigurationAttributePointer.java
index c8badae..e68f7fe 100644
--- a/src/test/java/org/apache/commons/configuration2/tree/xpath/TestConfigurationAttributePointer.java
+++ b/src/test/java/org/apache/commons/configuration2/tree/xpath/TestConfigurationAttributePointer.java
@@ -57,7 +57,7 @@
         final ImmutableNode.Builder ndBuilder = new ImmutableNode.Builder();
         ndBuilder.name("parent").addAttribute(ATTR_NAME, ATTR_VALUE);
         final ImmutableNode nd = ndBuilder.create();
-        parent = new ConfigurationNodePointer<>(nd, Locale.ENGLISH, new InMemoryNodeModel(nd).getNodeHandler());
+        parent = new ConfigurationNodePointer<>(nd, Locale.ROOT, new InMemoryNodeModel(nd).getNodeHandler());
         pointer = new ConfigurationAttributePointer<>(parent, ATTR_NAME);
     }