diff --git a/ShopifySharp.Tests/Infrastructure/Serialization/Http/GraphHttpContentSerializerTests.cs b/ShopifySharp.Tests/Infrastructure/Serialization/Http/GraphHttpContentSerializerTests.cs
new file mode 100644
index 000000000..62e572bb2
--- /dev/null
+++ b/ShopifySharp.Tests/Infrastructure/Serialization/Http/GraphHttpContentSerializerTests.cs
@@ -0,0 +1,121 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Threading.Tasks;
+using FluentAssertions;
+using JetBrains.Annotations;
+using ShopifySharp.Infrastructure;
+using ShopifySharp.Services.Graph;
+using Xunit;
+
+namespace ShopifySharp.Tests.Infrastructure.Serialization.Http;
+
+[Trait("Category", "Serialization"), TestSubject(typeof(GraphHttpContentSerializer))]
+public class GraphHttpContentSerializerTests
+{
+    private const string Query = "some-query";
+    private readonly RequestUri _requestUri = new (new Uri("https://example.com"));
+
+    private readonly GraphHttpContentSerializer _sut = new(Serializer.SerializerDefaults);
+
+    [Fact]
+    public async Task SerializeGraphRequest_ShouldSerializeDataToJson()
+    {
+        // Setup
+        var variables = new Dictionary<string, object>
+        {
+            { "baz", "bat" },
+            { "hello", "world" },
+        };
+
+        // Act
+        var result = _sut.SerializeGraphRequest(_requestUri, new GraphRequest
+        {
+            Query = Query,
+            Variables = variables,
+        });
+        var jsonStr = await result.ReadAsStringAsync();
+
+        // Assert
+        jsonStr.Should().Be($$$"""{"query":"{{{Query}}}","variables":{"baz":"bat","hello":"world"}}""");
+    }
+
+#if NET6_0_OR_GREATER
+    [Fact]
+    public void SerializeGraphRequest_WhenExecutingInEnvironmentThatSupportsSystemMemory_ShouldReturnReadOnlyMemoryContent()
+    {
+        // Setup
+        var variables = new Dictionary<string, object>
+        {
+            { "baz", "bat" },
+            { "hello", "world" },
+        };
+
+        // Act
+        var result = _sut.SerializeGraphRequest(_requestUri, new GraphRequest
+        {
+            Query = Query,
+            Variables = variables,
+        });
+
+        // Assert
+        result.Should().BeOfType<ReadOnlyMemoryContent>();
+        result.Headers.ContentType?.MediaType.Should().Be("application/json");
+    }
+#else
+    [Fact]
+    public void SerializeGraphRequest_WhenExecutingInEnvironmentThatDoesNotSupportSystemMemory_ShouldReturnStringContent()
+    {
+        // Setup
+        var variables = new Dictionary<string, object>
+        {
+            { "baz", "bat" },
+            { "hello", "world" },
+        };
+
+        // Act
+        var result = _sut.SerializeGraphRequest(_requestUri, new GraphRequest
+        {
+            Query = Query,
+            Variables = variables,
+        });
+
+        // Assert
+        result.Should().BeOfType<StringContent>();
+        result.Headers.ContentType.MediaType.Should().Be("application/json");
+    }
+#endif
+
+    #region Serializer.SerializerDefaults
+
+    [Fact]
+    public async Task WhenSerializingGraphRequest_ShouldOnlySerializeTheQueryAndVariablesPropertiesAndIgnoreAllOtherProperties()
+    {
+        // Setup
+        var variables = new Dictionary<string, object>
+        {
+            { "baz", "bat" },
+            { "hello", null },
+            { "world", 1 }
+        };
+        const string expectedJson =
+            $$$"""
+              {"query":"{{{Query}}}","variables":{"baz":"bat","hello":null,"world":1}}
+              """;
+
+        // Act
+        var result = _sut.SerializeGraphRequest(_requestUri, new GraphRequest
+        {
+            Query = Query,
+            Variables = variables,
+            EstimatedQueryCost = 123,
+            UserErrorHandling = GraphRequestUserErrorHandling.DoNotThrow
+        });
+        var jsonStr = await result.ReadAsStringAsync();
+
+        // Assert
+        jsonStr.Should().Be(expectedJson);
+    }
+
+    #endregion
+}