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src/StellaOps.Feedser/StellaOps.Feedser.Source.Common.Tests/Json/JsonSchemaValidatorTests.cs

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+using System;
+using System.Text.Json;
+using Json.Schema;
+using Microsoft.Extensions.Logging.Abstractions;
+using StellaOps.Feedser.Source.Common.Json;
+
+namespace StellaOps.Feedser.Source.Common.Tests.Json;
+
+public sealed class JsonSchemaValidatorTests
+{
+    private static JsonSchema CreateSchema()
+        => JsonSchema.FromText("""
+        {
+          "type": "object",
+          "properties": {
+            "id": { "type": "string" },
+            "count": { "type": "integer", "minimum": 1 }
+          },
+          "required": ["id", "count"],
+          "additionalProperties": false
+        }
+        """);
+
+    [Fact]
+    public void Validate_AllowsDocumentsMatchingSchema()
+    {
+        var schema = CreateSchema();
+        using var document = JsonDocument.Parse("""{"id":"abc","count":2}""");
+        var validator = new JsonSchemaValidator(NullLogger<JsonSchemaValidator>.Instance);
+
+        var exception = Record.Exception(() => validator.Validate(document, schema, "valid-doc"));
+
+        Assert.Null(exception);
+    }
+
+    [Fact]
+    public void Validate_ThrowsWithDetailedViolations()
+    {
+        var schema = CreateSchema();
+        using var document = JsonDocument.Parse("""{"count":0,"extra":"nope"}""");
+        var validator = new JsonSchemaValidator(NullLogger<JsonSchemaValidator>.Instance);
+
+        var ex = Assert.Throws<JsonSchemaValidationException>(() => validator.Validate(document, schema, "invalid-doc"));
+
+        Assert.Equal("invalid-doc", ex.DocumentName);
+        Assert.NotEmpty(ex.Errors);
+        Assert.Contains(ex.Errors, error => error.Keyword == "required");
+        Assert.Contains(ex.Errors, error => error.SchemaLocation.Contains("#/additionalProperties", StringComparison.Ordinal));
+        Assert.Contains(ex.Errors, error => error.Keyword == "minimum");
+    }
+}