1 files changed, 112 insertions, 0 deletions
diff --git a/tests/Jellyfin.Extensions.Tests/Json/Converters/JsonDefaultStringEnumConverterTests.cs b/tests/Jellyfin.Extensions.Tests/Json/Converters/JsonDefaultStringEnumConverterTests.cs
new file mode 100644
index 000000000..4fd9fd290
--- /dev/null
+++ b/tests/Jellyfin.Extensions.Tests/Json/Converters/JsonDefaultStringEnumConverterTests.cs
@@ -0,0 +1,112 @@
+using System.Text.Json;
+using Jellyfin.Data.Enums;
+using Jellyfin.Extensions.Json.Converters;
+using Xunit;
+
+namespace Jellyfin.Extensions.Tests.Json.Converters;
+
+public class JsonDefaultStringEnumConverterTests
+{
+    private readonly JsonSerializerOptions _jsonOptions = new() { Converters = { new JsonDefaultStringEnumConverterFactory() } };
+
+    /// <summary>
+    /// Test to ensure that `null` and empty string are deserialized to the default value.
+    /// </summary>
+    /// <param name="input">The input string.</param>
+    /// <param name="output">The expected enum value.</param>
+    [Theory]
+    [InlineData("\"\"", MediaStreamProtocol.Http)]
+    [InlineData("\"Http\"", MediaStreamProtocol.Http)]
+    [InlineData("\"Hls\"", MediaStreamProtocol.Hls)]
+    public void Deserialize_Enum_Direct(string input, MediaStreamProtocol output)
+    {
+        var value = JsonSerializer.Deserialize<MediaStreamProtocol>(input, _jsonOptions);
+        Assert.Equal(output, value);
+    }
+
+    /// <summary>
+    /// Test to ensure that `null` and empty string are deserialized to the default value.
+    /// </summary>
+    /// <param name="input">The input string.</param>
+    /// <param name="output">The expected enum value.</param>
+    [Theory]
+    [InlineData(null, MediaStreamProtocol.Http)]
+    [InlineData("\"\"", MediaStreamProtocol.Http)]
+    [InlineData("\"Http\"", MediaStreamProtocol.Http)]
+    [InlineData("\"Hls\"", MediaStreamProtocol.Hls)]
+    public void Deserialize_Enum(string? input, MediaStreamProtocol output)
+    {
+        input ??= "null";
+        var json = $"{{ \"EnumValue\": {input} }}";
+        var value = JsonSerializer.Deserialize<TestClass>(json, _jsonOptions);
+        Assert.NotNull(value);
+        Assert.Equal(output, value.EnumValue);
+    }
+
+    /// <summary>
+    /// Test to ensure that empty string is deserialized to the default value,
+    /// and `null` is deserialized to `null`.
+    /// </summary>
+    /// <param name="input">The input string.</param>
+    /// <param name="output">The expected enum value.</param>
+    [Theory]
+    [InlineData(null, null)]
+    [InlineData("\"\"", MediaStreamProtocol.Http)]
+    [InlineData("\"Http\"", MediaStreamProtocol.Http)]
+    [InlineData("\"Hls\"", MediaStreamProtocol.Hls)]
+    public void Deserialize_Enum_Nullable(string? input, MediaStreamProtocol? output)
+    {
+        input ??= "null";
+        var json = $"{{ \"EnumValue\": {input} }}";
+        var value = JsonSerializer.Deserialize<NullTestClass>(json, _jsonOptions);
+        Assert.NotNull(value);
+        Assert.Equal(output, value.EnumValue);
+    }
+
+    /// <summary>
+    /// Ensures that the roundtrip serialization & deserialization is successful.
+    /// </summary>
+    /// <param name="input">Input enum.</param>
+    /// <param name="output">Output enum.</param>
+    [Theory]
+    [InlineData(MediaStreamProtocol.Http, MediaStreamProtocol.Http)]
+    [InlineData(MediaStreamProtocol.Hls, MediaStreamProtocol.Hls)]
+    public void Enum_RoundTrip(MediaStreamProtocol input, MediaStreamProtocol output)
+    {
+        var inputObj = new TestClass { EnumValue = input };
+
+        var outputObj = JsonSerializer.Deserialize<TestClass>(JsonSerializer.Serialize(inputObj, _jsonOptions), _jsonOptions);
+
+        Assert.NotNull(outputObj);
+        Assert.Equal(output, outputObj.EnumValue);
+    }
+
+    /// <summary>
+    /// Ensures that the roundtrip serialization & deserialization is successful, including null.
+    /// </summary>
+    /// <param name="input">Input enum.</param>
+    /// <param name="output">Output enum.</param>
+    [Theory]
+    [InlineData(MediaStreamProtocol.Http, MediaStreamProtocol.Http)]
+    [InlineData(MediaStreamProtocol.Hls, MediaStreamProtocol.Hls)]
+    [InlineData(null, null)]
+    public void Enum_RoundTrip_Nullable(MediaStreamProtocol? input, MediaStreamProtocol? output)
+    {
+        var inputObj = new NullTestClass { EnumValue = input };
+
+        var outputObj = JsonSerializer.Deserialize<NullTestClass>(JsonSerializer.Serialize(inputObj, _jsonOptions), _jsonOptions);
+
+        Assert.NotNull(outputObj);
+        Assert.Equal(output, outputObj.EnumValue);
+    }
+
+    private sealed class TestClass
+    {
+        public MediaStreamProtocol EnumValue { get; set; }
+    }
+
+    private sealed class NullTestClass
+    {
+        public MediaStreamProtocol? EnumValue { get; set; }
+    }
+}