Add tests for SystemJsonObjectEnumerator

ShopifySharp.Tests/Infrastructure/Serialization/Json/SystemJsonObjectEnumeratorTests.cs

@@ -0,0 +1,71 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.Json;
+using FluentAssertions;
+using JetBrains.Annotations;
+using ShopifySharp.Infrastructure.Serialization.Json;
+using Xunit;
+
+namespace ShopifySharp.Tests.Infrastructure.Serialization.Json;
+
+[Trait("Category", "Serialization"), TestSubject(typeof(SystemJsonObjectEnumerator))]
+public class SystemJsonObjectEnumeratorTests
+{
+    [Fact]
+    public void GetEnumerator_ShouldEnumerateObjectValues()
+    {
+        // Setup
+        using var doc = JsonDocument.Parse("""{"foo":123,"bar":"abc"}""");
+        var objectEnumerator = doc.RootElement.EnumerateObject();
+        var sut = new SystemJsonObjectEnumerator(objectEnumerator);
+
+        // Act
+        var results = sut.ToList();
+
+        // Assert
+        results.Should().HaveCount(2);
+        results[0].GetRawObject().Should().BeOfType<JsonElement>().Which.GetInt32().Should().Be(123);
+        results[1].GetRawObject().Should().BeOfType<JsonElement>().Which.GetString().Should().Be("abc");
+    }
+
+    [Fact]
+    public void GetEnumerator_WhenCastToAnIEnumerable_ShouldGetEnumeratorAndIterate()
+    {
+        // Setup
+        using var doc = JsonDocument.Parse("""{"foo":123,"bar":"abc"}""");
+        var objectEnumerator = doc.RootElement.EnumerateObject();
+        IEnumerable sut = new SystemJsonObjectEnumerator(objectEnumerator);
+        var props = new List<JsonValueType>();
+
+        // Act
+        foreach (var item in sut)
+        {
+            if (item is SystemJsonElement {ValueType: var valueType})
+                props.Add(valueType);
+        }
+
+        // Assert
+        props.Should().HaveCount(2);
+        props.Should().ContainInOrder(JsonValueType.Number, JsonValueType.String);
+    }
+
+    [Fact]
+    public void Dispose_CalledMultipleTimes_DoesNotThrow()
+    {
+        // Setup
+        using var doc = JsonDocument.Parse("""{"foo":"bar"}""");
+        var objectEnumerator = doc.RootElement.EnumerateObject();
+        var sut = new SystemJsonObjectEnumerator(objectEnumerator);
+
+        // Act
+        var act = () =>
+        {
+            for (var i = 0; i < 4; i++)
+                sut.Dispose();
+        };
+
+        // Assert
+        act.Should().NotThrow();
+    }
+}