#1467 Fix character issues by always using UTF-8 when reading and writing

- Change usages of Bukkit's FileResource to a ConfigMe PropertyReader
- Specify UTF-8 for reading and writing

src/test/java/fr/xephi/authme/ClassesConsistencyTest.java

@@ -18,6 +18,7 @@ import org.junit.Test;
 import java.io.File;
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -49,6 +50,7 @@ public class ClassesConsistencyTest {
     private static final Set<Class<?>> IMMUTABLE_TYPES = ImmutableSet.of(
         /* JDK */
         int.class, long.class, float.class, String.class, File.class, Enum.class, collectionsUnmodifiableList(),
+        Charset.class,
         /* AuthMe */
         Property.class, RegistrationMethod.class,
         /* Guava */

src/test/java/fr/xephi/authme/message/updater/MigraterYamlFileResourceTest.java

@@ -0,0 +1,70 @@
+package fr.xephi.authme.message.updater;
+
+import ch.jalu.configme.configurationdata.ConfigurationData;
+import ch.jalu.configme.properties.Property;
+import ch.jalu.configme.properties.StringProperty;
+import com.google.common.io.Files;
+import fr.xephi.authme.TestHelper;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test for {@link MigraterYamlFileResource}.
+ */
+public class MigraterYamlFileResourceTest {
+
+    private static final String CHINESE_MESSAGES_FILE = TestHelper.PROJECT_ROOT + "message/chinese_texts.yml";
+
+    @Rule
+    public TemporaryFolder temporaryFolder = new TemporaryFolder();
+
+    @Test
+    public void shouldReadChineseFile() {
+        // given
+        File file = TestHelper.getJarFile(CHINESE_MESSAGES_FILE);
+
+        // when
+        MigraterYamlFileResource resource = new MigraterYamlFileResource(file);
+
+        // then
+        assertThat(resource.getString("first"), equalTo("错误的密码"));
+        assertThat(resource.getString("second"), equalTo("为了验证您的身份，您需要将一个电子邮件地址与您的帐户绑定！"));
+        assertThat(resource.getString("third"), equalTo("您已经可以在当前会话中执行任何敏感命令！"));
+    }
+
+    @Test
+    public void shouldWriteWithCorrectCharset() throws IOException {
+        // given
+        File file = temporaryFolder.newFile();
+        Files.copy(TestHelper.getJarFile(CHINESE_MESSAGES_FILE), file);
+        MigraterYamlFileResource resource = new MigraterYamlFileResource(file);
+        String newMessage = "您当前并没有任何邮箱与该账号绑定";
+        resource.setValue("third", newMessage);
+
+        // when
+        resource.exportProperties(buildConfigurationData());
+
+        // then
+        resource = new MigraterYamlFileResource(file);
+        assertThat(resource.getString("first"), equalTo("错误的密码"));
+        assertThat(resource.getString("second"), equalTo("为了验证您的身份，您需要将一个电子邮件地址与您的帐户绑定！"));
+        assertThat(resource.getString("third"), equalTo(newMessage));
+    }
+
+    private static ConfigurationData buildConfigurationData() {
+        List<Property<?>> properties = Arrays.asList(
+            new StringProperty("first", "first"),
+            new StringProperty("second", "second"),
+            new StringProperty("third", "third"));
+        return new ConfigurationData(properties);
+    }
+}