diff --git a/Tests/LibMatrix.Tests/Tests/CanonicalJsonTests.cs b/Tests/LibMatrix.Tests/Tests/CanonicalJsonTests.cs
new file mode 100644
index 0000000..c7fde54
--- /dev/null
+++ b/Tests/LibMatrix.Tests/Tests/CanonicalJsonTests.cs
@@ -0,0 +1,53 @@
+using System.Collections.Frozen;
+using System.Diagnostics;
+using System.Text.Json;
+using LibMatrix.Extensions;
+using LibMatrix.Services;
+using LibMatrix.Tests.Abstractions;
+using LibMatrix.Tests.DataTests;
+using LibMatrix.Tests.Fixtures;
+using Xunit.Abstractions;
+using Xunit.Microsoft.DependencyInjection.Abstracts;
+using Xunit.Sdk;
+
+namespace LibMatrix.Tests.Tests;
+
+public class CanonicalJsonTests(ITestOutputHelper testOutputHelper, TestFixture fixture) : TestBed<TestFixture>(testOutputHelper, fixture) {
+ // Test cases from https://spec.matrix.org/v1.11/appendices/#examples
+ private static readonly FrozenDictionary<string, string> testCases = new Dictionary<string, string>() {
+ ["{}"] = "{}",
+ ["{\n \"one\": 1,\n \"two\": \"Two\"\n}\n"] = "{\"one\":1,\"two\":\"Two\"}",
+ ["{\n \"b\": \"2\",\n \"a\": \"1\"\n}\n"] = "{\"a\":\"1\",\"b\":\"2\"}",
+ ["{\"b\":\"2\",\"a\":\"1\"}"] = "{\"a\":\"1\",\"b\":\"2\"}",
+ ["{\n \"auth\": {\n \"success\": true,\n \"mxid\": \"@john.doe:example.com\",\n \"profile\": {\n \"display_name\": \"John Doe\",\n \"three_pids\": [\n {\n \"medium\": \"email\",\n \"address\": \"[email protected]\"\n },\n {\n \"medium\": \"msisdn\",\n \"address\": \"123456789\"\n }\n ]\n }\n }\n}\n"] =
+ "{\"auth\":{\"mxid\":\"@john.doe:example.com\",\"profile\":{\"display_name\":\"John Doe\",\"three_pids\":[{\"address\":\"[email protected]\",\"medium\":\"email\"},{\"address\":\"123456789\",\"medium\":\"msisdn\"}]},\"success\":true}}",
+ ["{\n \"a\": \"日本語\"\n}\n"] = "{\"a\":\"日本語\"}",
+ ["{\n \"本\": 2,\n \"日\": 1\n}\n"] = "{\"日\":1,\"本\":2}",
+ ["{\n \"a\": \"\\u65E5\"\n}\n"] = "{\"a\":\"日\"}",
+ ["{\n \"a\": null\n}\n"] = "{\"a\":null}",
+ ["{\n \"a\": -0,\n \"b\": 1e10\n}\n"] = "{\"a\":0,\"b\":10000000000}"
+ }.ToFrozenDictionary();
+
+ [Fact]
+ public void SpecTests() {
+ var i = 0;
+ foreach (var (input, expected) in testCases) {
+ var deserialised = JsonSerializer.Deserialize<Dictionary<string, object>>(input);
+ var actual = CanonicalJsonSerializer.Serialize(deserialised);
+ Assert.Equal(expected, actual);
+ // testOutputHelper.WriteLine($"Test case {i++} successful!");
+ }
+ }
+
+ [Fact]
+ public void RepeatTests() {
+ var sw = Stopwatch.StartNew();
+ for (int i = 0; i < 1_000_000; i++) {
+ SpecTests();
+ if (i % 10000 == 0) {
+ testOutputHelper.WriteLine($"{i} loops successful! Delta: {sw.Elapsed}");
+ sw.Restart();
+ }
+ }
+ }
+}
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