test: add draft workflow coverage and sqlite migration helpers

JobTrackerApi.Tests/SqliteMigrationHelperTests.cs

@@ -0,0 +1,25 @@
+using System.Text;
+using System.Text.Json;
+using Microsoft.Data.Sqlite;
+using Xunit;
+
+namespace JobTrackerApi.Tests;
+
+public sealed class SqliteMigrationHelperTests
+{
+    [Fact]
+    public void Export_payload_shape_can_be_serialized()
+    {
+        var payload = new
+        {
+            users = new[] { new { Id = "u1", Email = "u@example.com" } },
+            companies = new[] { new { Id = 1, Name = "Acme" } },
+            jobs = new[] { new { Id = 1, JobTitle = "Backend Dev" } }
+        };
+
+        var json = JsonSerializer.Serialize(payload);
+        Assert.Contains("users", json);
+        Assert.Contains("companies", json);
+        Assert.Contains("jobs", json);
+    }
+}