diff --git a/test/data/models/exposure_pair_test.dart b/test/data/models/exposure_pair_test.dart
new file mode 100644
index 0000000..9143750
--- /dev/null
+++ b/test/data/models/exposure_pair_test.dart
@@ -0,0 +1,38 @@
+import 'package:lightmeter/data/models/exposure_pair.dart';
+import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test('toString()', () {
+    expect(
+      ExposurePair(ApertureValue.values.first, ShutterSpeedValue.values.first).toString(),
+      '${ApertureValue.values.first} - ${ShutterSpeedValue.values.first}',
+    );
+  });
+
+  test('==', () {
+    expect(
+      ExposurePair(ApertureValue.values.first, ShutterSpeedValue.values.first) ==
+          ExposurePair(ApertureValue.values.first, ShutterSpeedValue.values.first),
+      true,
+    );
+    expect(
+      ExposurePair(ApertureValue.values.first, ShutterSpeedValue.values.first) ==
+          ExposurePair(ApertureValue.values.first, ShutterSpeedValue.values.last),
+      false,
+    );
+  });
+
+  test('hashCode', () {
+    expect(
+      ExposurePair(ApertureValue.values.first, ShutterSpeedValue.values.first).hashCode ==
+          ExposurePair(ApertureValue.values.first, ShutterSpeedValue.values.first).hashCode,
+      true,
+    );
+    expect(
+      ExposurePair(ApertureValue.values.first, ShutterSpeedValue.values.first).hashCode ==
+          ExposurePair(ApertureValue.values.first, ShutterSpeedValue.values.last).hashCode,
+      false,
+    );
+  });
+}
diff --git a/test/data/models/supported_locale_test.dart b/test/data/models/supported_locale_test.dart
index 6d92154..83f7489 100644
--- a/test/data/models/supported_locale_test.dart
+++ b/test/data/models/supported_locale_test.dart
@@ -6,11 +6,13 @@ void main() {
     expect(SupportedLocale.en.intlName, 'en');
     expect(SupportedLocale.fr.intlName, 'fr');
     expect(SupportedLocale.ru.intlName, 'ru');
+    expect(SupportedLocale.zh.intlName, 'zh');
   });
 
   test('localizedName', () {
     expect(SupportedLocale.en.localizedName, 'English');
     expect(SupportedLocale.fr.localizedName, 'Français');
     expect(SupportedLocale.ru.localizedName, 'Русский');
+    expect(SupportedLocale.zh.localizedName, '简体中文');
   });
 }