Package cleanup

- authme.cache to authme.data
- Rename PlayerData to LimboPlayer to match with LimboCache
- Move authme.converter to authme.datasource.converter
- Split output package into output and message

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

@@ -0,0 +1,75 @@
+package fr.xephi.authme.message;
+
+import fr.xephi.authme.TestHelper;
+import fr.xephi.authme.util.StringUtils;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.junit.Test;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+
+import static org.junit.Assert.fail;
+
+/**
+ * Tests that all YML message files can be loaded.
+ */
+public class MessagesFileYamlCheckerTest {
+
+    /** Path in the resources folder where the message files are located. */
+    private static final String MESSAGES_FOLDER = "/messages/";
+    /** Pattern of the message file names. */
+    private static final Pattern MESSAGE_FILE_PATTERN = Pattern.compile("messages_\\w+\\.yml");
+    /** Message key that is present in all files. Used to make sure that text is returned. */
+    private static final MessageKey MESSAGE_KEY = MessageKey.LOGIN_MESSAGE;
+
+    @Test
+    public void shouldAllBeValidYaml() {
+        // given
+        List<File> messageFiles = getMessageFiles();
+
+        // when
+        List<String> errors = new ArrayList<>();
+        for (File file : messageFiles) {
+            String error = null;
+            try {
+                YamlConfiguration configuration = YamlConfiguration.loadConfiguration(file);
+                if (StringUtils.isEmpty(configuration.getString(MESSAGE_KEY.getKey()))) {
+                    error = "Message for '" + MESSAGE_KEY + "' is empty";
+                }
+            } catch (Exception e) {
+                error = "Could not load file: " + StringUtils.formatException(e);
+            }
+            if (!StringUtils.isEmpty(error)) {
+                errors.add(file.getName() + ": " + error);
+            }
+        }
+
+        // then
+        if (!errors.isEmpty()) {
+            fail("Errors during verification of message files:\n-" + String.join("\n-", errors));
+        }
+    }
+
+
+    private List<File> getMessageFiles() {
+        File folder = TestHelper.getJarFile(MESSAGES_FOLDER);
+        File[] files = folder.listFiles();
+        if (files == null) {
+            throw new IllegalStateException("Could not read folder '" + folder.getName() + "'");
+        }
+
+        List<File> messageFiles = new ArrayList<>();
+        for (File file : files) {
+            if (MESSAGE_FILE_PATTERN.matcher(file.getName()).matches()) {
+                messageFiles.add(file);
+            }
+        }
+        if (messageFiles.isEmpty()) {
+            throw new IllegalStateException("Error getting message files: list of files is empty");
+        }
+        return messageFiles;
+    }
+
+}