changed.项目结构优化

tests/LanMountainDesktop.Tests/LocalizationServiceTests.cs

@@ -0,0 +1,83 @@
+using LanMountainDesktop.Services;
+using Xunit;
+
+namespace LanMountainDesktop.Tests;
+
+public sealed class LocalizationServiceTests
+{
+    private readonly LocalizationService _service = new();
+
+    [Theory]
+    [InlineData(null, "zh-CN")]
+    [InlineData("", "zh-CN")]
+    [InlineData("  ", "zh-CN")]
+    [InlineData("zh-CN", "zh-CN")]
+    [InlineData("zh-cn", "zh-CN")]
+    [InlineData("en-US", "en-US")]
+    [InlineData("en-us", "en-US")]
+    [InlineData("en", "en-US")]
+    [InlineData("EN", "en-US")]
+    [InlineData("ja-JP", "ja-JP")]
+    [InlineData("ja-jp", "ja-JP")]
+    [InlineData("ja", "ja-JP")]
+    [InlineData("JA", "ja-JP")]
+    [InlineData("ko-KR", "ko-KR")]
+    [InlineData("ko-kr", "ko-KR")]
+    [InlineData("ko", "ko-KR")]
+    [InlineData("KO", "ko-KR")]
+    [InlineData("fr-FR", "zh-CN")]
+    [InlineData("de", "zh-CN")]
+    [InlineData("unknown", "zh-CN")]
+    public void NormalizeLanguageCode_MapsToSupportedLocales(string? input, string expected)
+    {
+        Assert.Equal(expected, _service.NormalizeLanguageCode(input));
+    }
+
+    [Fact]
+    public void GetString_ReturnsFallbackWhenNoLanguageFilesExist()
+    {
+        var result = _service.GetString("en-US", "nonexistent.key", "Default Value");
+
+        Assert.Equal("Default Value", result);
+    }
+
+    [Fact]
+    public void GetString_ReturnsFallbackForEmptyKey()
+    {
+        var result = _service.GetString("en-US", "", "Fallback");
+
+        Assert.Equal("Fallback", result);
+    }
+
+    [Fact]
+    public void GetString_FallsBackForUnknownLanguage()
+    {
+        var result = _service.GetString("fr-FR", "some.key", "Fallback");
+
+        Assert.Equal("Fallback", result);
+    }
+
+    [Fact]
+    public void ClearCache_WithNull_ClearsAllEntries()
+    {
+        _service.ClearCache(null);
+        var result = _service.GetString("en-US", "test.key", "After");
+        Assert.Equal("After", result);
+    }
+
+    [Fact]
+    public void ClearCache_WithSpecificCode_ClearsOnlyThatLanguage()
+    {
+        _service.ClearCache("en-US");
+        var result = _service.GetString("en-US", "test.key", "Cleared");
+        Assert.Equal("Cleared", result);
+    }
+
+    [Fact]
+    public void ClearCache_WithWhitespace_ClearsAllEntries()
+    {
+        _service.ClearCache("  ");
+        var result = _service.GetString("ja-JP", "test.key", "AllCleared");
+        Assert.Equal("AllCleared", result);
+    }
+}