Use more idiomatic naming in test code.

(I introduced this in https://android-git.corp.google.com/g/46305.)

Change-Id: I100202fc18e246dd7b66870ce75543642505336d
diff --git a/luni/src/test/java/java/text/DateFormatSymbolsTest.java b/luni/src/test/java/java/text/DateFormatSymbolsTest.java
index 82f67ab..56968b8 100644
--- a/luni/src/test/java/java/text/DateFormatSymbolsTest.java
+++ b/luni/src/test/java/java/text/DateFormatSymbolsTest.java
@@ -23,16 +23,16 @@
 import java.util.Locale;
 
 public class DateFormatSymbolsTest extends junit.framework.TestCase {
-    private void checkLocaleIsEquivalentToRoot(Locale locale) {
+    private void assertLocaleIsEquivalentToRoot(Locale locale) {
         DateFormatSymbols dfs = DateFormatSymbols.getInstance(locale);
         assertEquals(DateFormatSymbols.getInstance(Locale.ROOT), dfs);
     }
     public void test_getInstance_unknown_locale() throws Exception {
         // TODO: we fail this test. on Android, the root locale uses GMT offsets as names.
         // see the invalid locale test below. on the RI, the root locale uses English names.
-        checkLocaleIsEquivalentToRoot(new Locale("xx", "XX"));
+        assertLocaleIsEquivalentToRoot(new Locale("xx", "XX"));
     }
     public void test_getInstance_invalid_locale() throws Exception {
-        checkLocaleIsEquivalentToRoot(new Locale("not exist language", "not exist country"));
+        assertLocaleIsEquivalentToRoot(new Locale("not exist language", "not exist country"));
     }
 }