diff --git a/tests/test-load-textdomain.php b/tests/test-load-textdomain.php
index d2f524a..e0ea889 100644
--- a/tests/test-load-textdomain.php
+++ b/tests/test-load-textdomain.php
@@ -1,73 +1,32 @@
 <?php
-/**
- * Class TestLoadTextdomain
- */
 
-class Test_LoadTextdomain extends WP_UnitTestCase {
-	protected static $user_id;
+class Test_Translation extends WP_UnitTestCase {
 
-	public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ) {
-		self::$user_id = $factory->user->create(
-			array(
-				'role'   => 'administrator',
-				'locale' => 'ja',
-			)
-		);
-	}
-
-	/**
-	 * @covers ::geolonia_gis_load_textdomain
-	 */
-	public function test_load_textdomain() {
+	public function set_up() {
+		parent::set_up();
 
 		add_filter('locale', function() {
 			return 'ja';
 		});
-		$this->assertTrue( geolonia_gis_load_textdomain() );
-	}
 
-	/**
-	 * @covers ::geolonia_gis_load_textdomain
-	 */
-	public function test_load_textdomain_by_plugin_locale() {
-		add_filter('plugin_locale', function() {
-			return 'ja';
-		});
-		$this->assertTrue( geolonia_gis_load_textdomain() );
-	}
-
-	/**
-	 * @covers ::geolonia_gis_load_textdomain
-	 */
-	public function test_load_textdomain_when_locale_is_english() {
-		add_filter('locale', function() {
-			return 'en_US';
-		});
-		$this->assertFalse( geolonia_gis_load_textdomain() );
+		load_plugin_textdomain( 'geolonia-open-gis', false, dirname(dirname( plugin_basename( __FILE__ ) )). '/languages' );
 	}
 
-	/**
-	 * @covers ::geolonia_gis_load_textdomain
-	 */
-	public function test_load_textdomain_plugin_locale_is_english() {
-		add_filter('plugin_locale', function() {
-			return 'en_US';
-		});
-		$this->assertFalse( geolonia_gis_load_textdomain() );
-	}
-
-	/**
-	 * @covers ::geolonia_gis_load_textdomain
-	 */
-	public function test_load_textdomain_user_locale_is_japanese() {
-
-		add_filter('locale', function() {
-			return 'en_US';
-		});
-
-		set_current_screen( 'dashboard' );
-		wp_set_current_user( self::$user_id );
-
-		$this->assertTrue( geolonia_gis_load_textdomain() );
+	public function test_translation() {
+
+		$domain = 'geolonia-open-gis';
+
+		$this->assertSame( 'GeoJSON をアップロードしてください', __( 'Upload GeoJSON', $domain ) );
+		$this->assertSame( '座標', __( 'Coordinates', $domain ) );
+		$this->assertSame( '現在の座標を使用する', __( 'Use the current coordinates', $domain ) );
+		$this->assertSame( 'ズーム', __( 'Zoom', $domain ) );
+		$this->assertSame( '現在のズームレベルを使用する', __( 'Use the current zoom level', $domain ) );
+		$this->assertSame( 'スタイル', __( 'Style', $domain ) );
+		$this->assertSame( '地物の数: <span id="num-of-features"></span>', __( 'Number of features: <span id="num-of-features"></span>', $domain ) );
+		$this->assertSame( '標準', __( 'Standard', $domain ) );
+		$this->assertSame( '地理院地図', __( 'GSI', $domain ) );
+		$this->assertSame( '白地図', __( 'Blank Map', $domain ) );
+		$this->assertSame( '地図', __( 'Map', $domain ) );
+		$this->assertSame( '株式会社 Geolonia', __( 'Geolonia Inc.', $domain ) );
 	}
 }
diff --git a/tests/test-register_post_type_maps.php b/tests/test-register_post_type_maps.php
deleted file mode 100644
index d24fde9..0000000
--- a/tests/test-register_post_type_maps.php
+++ /dev/null
@@ -1,94 +0,0 @@
-<?php
-
-class Test_Register_Post_Type_Maps extends WP_UnitTestCase {
-
-	public function set_up() {
-		parent::set_up();
-
-		unregister_post_type( 'maps' );
-	}
-
-	/**
-	 * @covers ::register_post_type_maps
-	 */
-	public function test_maps_post_type_registered() {
-
-		$this->assertNull( get_post_type_object( 'maps' ) );
-
-		register_post_type_maps();
-
-		$maps_object = get_post_type_object( 'maps' );
-
-        $this->assertInstanceOf( 'WP_Post_Type', $maps_object );
-		$this->assertSame( 'maps', $maps_object->name );
-	}
-
-    /**
-     * @covers ::register_post_type_maps
-     */
-    public function test_maps_post_type_options() {
-
-        $this->assertNull( get_post_type_object( 'maps' ) );
-
-        register_post_type_maps();
-
-        $maps_object = get_post_type_object( 'maps' );
-
-        // labels の設定値を確認
-        $this->assertSame( 'Map', $maps_object->label );
-
-        // public の設定値を確認
-        $this->assertTrue( $maps_object->public );
-
-        // hierarchical の設定値を確認
-        $this->assertFalse( $maps_object->hierarchical );
-
-        // show_ui の設定値を確認
-        $this->assertTrue( $maps_object->show_ui );
-
-        // show_in_menu の設定値を確認
-        $this->assertTrue( $maps_object->show_in_nav_menus );
-
-		// カスタム投稿タイプの supports に title が含まれているか確認
-		$this->assertTrue( post_type_supports( 'maps', 'title' ), 'Title support is enabled' );
-
-		// カスタム投稿タイプの supports に editor が含まれているか確認
-		$this->assertTrue( post_type_supports( 'maps', 'editor' ), 'Editor support is enabled' );
-
-		// カスタム投稿タイプの supports に author が含まれているか確認
-		$this->assertTrue( post_type_supports( 'maps', 'revisions' ), 'Revisions support is enabled' );
-
-		// カスタム投稿タイプの supports に excerpt が含まれているか確認
-		$this->assertTrue( post_type_supports( 'maps', 'excerpt' ), 'Excerpt support is enabled' );
-
-        // archive の設定値を確認
-        $this->assertFalse( $maps_object->has_archive );
-
-        // rewrite の設定値を確認
-        $this->assertSame( array('slug' => 'maps'), $maps_object->rewrite );
-
-        // query_var の設定値を確認
-        $this->assertSame( 'maps', $maps_object->query_var );
-
-        // menu_icon の設定値を確認
-        $this->assertSame( 'dashicons-location', $maps_object->menu_icon );
-
-        // show_in_rest の設定値を確認
-        $this->assertTrue( $maps_object->show_in_rest );
-
-        // rest_base の設定値を確認
-        $this->assertSame( GEOLONIA_GIS_POST_TYPE, $maps_object->rest_base );
-
-		// rest_controller_class の設定値を確認
-        $this->assertSame( 'WP_REST_Posts_Controller', $maps_object->rest_controller_class );
-
-        // taxonomies の設定値を確認
-        $this->assertSame( array( 'map_tag' ), $maps_object->taxonomies );
-
-        // capability_type の設定値を確認
-        $this->assertSame( 'map', $maps_object->capability_type );
-
-        // map_meta_cap の設定値を確認
-        $this->assertTrue( $maps_object->map_meta_cap );
-    }
-}