Added tests for schema migration

Tests/Yaml/SchemaMigrationTests.cs

@@ -0,0 +1,66 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using RackPeek.Domain.Persistence.Yaml;
+using RackPeek.Domain.Resources.UpsUnits;
+
+namespace Tests.Yaml;
+
+public class SchemaMigrationTests
+{
+    private static RackPeekConfigMigrationDeserializer Setup()
+    {
+        var services = new ServiceCollection();
+        services.AddLogging();
+
+        var provider = services.BuildServiceProvider();
+
+        return new RackPeekConfigMigrationDeserializer(
+            provider,
+            provider.GetRequiredService<ILogger<RackPeekConfigMigrationDeserializer>>());
+    }
+
+
+    [Fact]
+    public async Task Migrations_ensures_version_exists()
+    {
+        // Arrange
+        var sut = Setup();
+
+        var yaml = """
+                   resources:
+                   - kind: Ups
+                     name: example-ups
+                   """;
+
+        // Act
+        var result = await sut.Deserialize(yaml);
+
+        // Assert
+        Assert.NotNull(result);
+        Assert.Equal(RackPeekConfigMigrationDeserializer.ListOfMigrations.Count, result.Version);
+    }
+
+    [Fact]
+    public async Task Migrations_converts_runs_on_to_list()
+    {
+        // Arrange
+        var sut = Setup();
+
+        var yaml = """
+                   version: 1
+                   resources:
+                   - kind: Ups
+                     name: example-ups
+                     runsOn: rack-a1
+                   """;
+
+        // Act
+        var result = await sut.Deserialize(yaml);
+
+        // Assert
+        Assert.NotNull(result);
+        Assert.NotNull(result.Resources);
+        var ups = Assert.IsType<Ups>(result.Resources[0]);
+        Assert.Equal(ups.RunsOn, ["rack-a1"]);
+    }
+}