#1467 Change message keys and messages_en to new structure

src/test/java/fr/xephi/authme/message/MessageKeyTest.java

@@ -3,9 +3,12 @@ package fr.xephi.authme.message;
 import fr.xephi.authme.util.StringUtils;
 import org.junit.Test;
 
+import java.util.Arrays;
 import java.util.HashSet;
 import java.util.Set;
 
+import static org.hamcrest.Matchers.matchesPattern;
+import static org.junit.Assert.assertThat;
 import static org.junit.Assert.fail;
 
 /**
@@ -29,4 +32,18 @@ public class MessageKeyTest {
             }
         }
     }
+
+    @Test
+    public void shouldHaveWellFormedPlaceholders() {
+        // given
+        MessageKey[] messageKeys = MessageKey.values();
+
+        // when / then
+        for (MessageKey messageKey : messageKeys) {
+            String[] tags = messageKey.getTags();
+            Arrays.stream(tags)
+                .forEach(tag -> assertThat("Tag '" + tag + "' corresponds to valid format for key '" + messageKey + "'",
+                    tag, matchesPattern("^%[a-z_]+$")));
+        }
+    }
 }