Add initial unit tests

Dfe.Identifiers.Api.Test/ApiTestFixture.cs

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+using System.Net.Mime;
+using Dfe.Identifiers.Api.Context;
+using Microsoft.AspNetCore.Mvc.Testing;
+using Microsoft.Data.SqlClient;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+
+namespace Dfe.Identifiers.Api.Test
+{
+    public class ApiTestFixture : IDisposable
+    {
+        // private const string ConnectionStringKey = "ConnectionStrings:DefaultConnection";
+        private const string connectionString = "Server=localhost,1433;Database=ApiTests;User Id=sa;TrustServerCertificate=True;Password=StrongPassword905";
+        private DbContextOptions<MstrContext> _dbContextOptions { get; init; }
+
+        public ApiTestFixture()
+        {
+            _dbContextOptions = new DbContextOptionsBuilder<MstrContext>()
+                .UseSqlServer(connectionString)
+                .Options;
+            using var context = GetMstrContext();
+            context.Database.EnsureDeleted();
+            context.Database.Migrate();
+        }
+
+        public MstrContext GetMstrContext() => new MstrContext(_dbContextOptions);
+
+        public void Dispose()
+        {
+        }
+
+        // private static string BuildDatabaseConnectionString(IConfigurationBuilder config)
+        // {
+        //     var currentConfig = config.Build();
+        //     var connection = currentConfig[ConnectionStringKey];
+        //     var sqlBuilder = new SqlConnectionStringBuilder(connection);
+        //     sqlBuilder.InitialCatalog = "ApiTests";
+        //
+        //     var result = sqlBuilder.ToString();
+        //
+        //     return result;
+        // }
+    }
+}

Dfe.Identifiers.Api.Test/DatabaseModelBuilder.cs

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+using AutoFixture;
+using Dfe.Identifiers.Api.Models;
+
+namespace Dfe.Identifiers.Api.Test
+{
+    public static class DatabaseModelBuilder
+    {
+        private static readonly Fixture _fixture = new Fixture();
+
+        public static Trust BuildTrust()
+        {
+            var result = _fixture.Create<Trust>();
+            result.SK = null;
+            result.TrustStatus = "Open";
+            result.TrustTypeId = 30;
+            result.TrustType = null;
+            result.TrustStatusId = null;
+            result.RegionId = null;
+            result.TrustBandingId = null;
+            result.CurrentSingleListGrouping = result.CurrentSingleListGrouping.Substring(0, 19);
+            result.FollowUpLetterSent = result.CurrentSingleListGrouping.Substring(0, 19);
+            result.PrioritisedForReview = result.PrioritisedForReview.Substring(0, 19);
+            result.RID = result.RID.Substring(0, 10);
+
+            return result;
+        }
+
+        public static Establishment BuildEstablishment()
+        {
+            var result = _fixture.Create<Establishment>();
+            result.SK = null;
+            result.IfdPipeline = null;
+            result.LocalAuthority = null;
+            result.EstablishmentType = null;
+            result.PK_GIAS_URN = _fixture.Create<int>().ToString();
+            result.EstablishmentTypeId = 228;
+            result.LocalAuthorityId = 1;
+
+            return result;
+        }
+
+        public static IfdPipeline BuildIfdPipeline()
+        {
+            var result = _fixture.Create<IfdPipeline>();
+            result.SK = null;
+            result.GeneralDetailsUrn = _fixture.Create<int>().ToString();
+
+            return result;
+        }
+    }
+}

Dfe.Identifiers.Api.Test/Extensions/ActionResultExtension.cs

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+using Dfe.Identifiers.Api.Models;
+using FluentAssertions;
+using Dfe.Identifiers.Api.Models.Identifiers;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Dfe.Identifiers.Api.Test.Extensions;
+
+public static class ActionResultExtension 
+{
+    public static Models.Identifiers.Identifiers? GetIdentifiers(this ActionResult<Models.Identifiers.Identifiers> actionResult)
+    {
+        return (Models.Identifiers.Identifiers?)((OkObjectResult?)actionResult.Result)?.Value;
+    }
+
+    public static int? GetStatusCode<T>(this ActionResult<T> actionResult)
+    {
+        return ((ObjectResult?)actionResult.Result)?.StatusCode;
+    }
+}

Dfe.Identifiers.Api.Test/GlobalUsings.cs

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+global using Xunit;