Added before migration hook, this can be used to insert "old" data into test Db

so data migration could be tested.

src/NzbDrone.Core.Test/Framework/DbTest.cs

@@ -89,7 +89,6 @@ namespace NzbDrone.Core.Test.Framework
         {
             WithTempAsAppPath();
 
-
             Mocker.SetConstant<IAnnouncer>(Mocker.Resolve<MigrationLogger>());
             Mocker.SetConstant<IConnectionStringFactory>(Mocker.Resolve<ConnectionStringFactory>());
             Mocker.SetConstant<IMigrationController>(Mocker.Resolve<MigrationController>());
@@ -97,9 +96,9 @@ namespace NzbDrone.Core.Test.Framework
             MapRepository.Instance.EnableTraceLogging = true;
 
             var factory = Mocker.Resolve<DbFactory>();
-            var _database = factory.Create(MigrationType);
-            _db = new TestDatabase(_database);
-            Mocker.SetConstant(_database);
+            var database = factory.Create(MigrationType);
+            _db = new TestDatabase(database);
+            Mocker.SetConstant(database);
         }
 
         [SetUp]

src/NzbDrone.Core/Datastore/DbFactory.cs

@@ -12,7 +12,7 @@ namespace NzbDrone.Core.Datastore
 {
     public interface IDbFactory
     {
-        IDatabase Create(MigrationType migrationType = MigrationType.Main);
+        IDatabase Create(MigrationType migrationType = MigrationType.Main, Action<NzbDroneMigrationBase> beforeMigration = null);
     }
 
     public class DbFactory : IDbFactory
@@ -43,7 +43,7 @@ namespace NzbDrone.Core.Datastore
             _connectionStringFactory = connectionStringFactory;
         }
 
-        public IDatabase Create(MigrationType migrationType = MigrationType.Main)
+        public IDatabase Create(MigrationType migrationType = MigrationType.Main, Action<NzbDroneMigrationBase> beforeMigration = null)
         {
             string connectionString;
 
@@ -66,7 +66,7 @@ namespace NzbDrone.Core.Datastore
                     }
             }
 
-            _migrationController.MigrateToLatest(connectionString, migrationType);
+            _migrationController.MigrateToLatest(connectionString, migrationType, beforeMigration);
 
             var db = new Database(() =>
                 {

src/NzbDrone.Core/Datastore/Migration/Framework/MigrationContext.cs

@@ -1,7 +1,18 @@
-namespace NzbDrone.Core.Datastore.Migration.Framework
+using System;
+
+namespace NzbDrone.Core.Datastore.Migration.Framework
 {
     public class MigrationContext
     {
-        public MigrationType MigrationType { get; set; }
+        public MigrationType MigrationType { get; private set; }
+
+        public Action<NzbDroneMigrationBase> BeforeMigration { get; private set; }
+
+        public MigrationContext(MigrationType migrationType, Action<NzbDroneMigrationBase> beforeAction)
+        {
+            MigrationType = migrationType;
+
+            BeforeMigration = beforeAction;
+        }
     }
 }

src/NzbDrone.Core/Datastore/Migration/Framework/MigrationController.cs

@@ -1,14 +1,14 @@
-using System.Diagnostics;
+using System;
+using System.Diagnostics;
 using System.Reflection;
 using FluentMigrator.Runner;
 using FluentMigrator.Runner.Initialization;
-using FluentMigrator.Runner.Processors.SQLite;
 
 namespace NzbDrone.Core.Datastore.Migration.Framework
 {
     public interface IMigrationController
     {
-        void MigrateToLatest(string connectionString, MigrationType migrationType);
+        void MigrateToLatest(string connectionString, MigrationType migrationType, Action<NzbDroneMigrationBase> beforeMigration);
     }
 
     public class MigrationController : IMigrationController
@@ -20,7 +20,7 @@ namespace NzbDrone.Core.Datastore.Migration.Framework
             _announcer = announcer;
         }
 
-        public void MigrateToLatest(string connectionString, MigrationType migrationType)
+        public void MigrateToLatest(string connectionString, MigrationType migrationType, Action<NzbDroneMigrationBase> beforeMigration)
         {
             var sw = Stopwatch.StartNew();
 
@@ -31,10 +31,7 @@ namespace NzbDrone.Core.Datastore.Migration.Framework
             var migrationContext = new RunnerContext(_announcer)
                 {
                     Namespace = "NzbDrone.Core.Datastore.Migration",
-                    ApplicationContext = new MigrationContext
-                        {
-                            MigrationType = migrationType
-                        }
+                    ApplicationContext = new MigrationContext(migrationType, beforeMigration)
                 };
 
             var options = new MigrationOptions { PreviewOnly = false, Timeout = 60 };
@@ -45,7 +42,7 @@ namespace NzbDrone.Core.Datastore.Migration.Framework
 
             sw.Stop();
 
-           _announcer.ElapsedTime(sw.Elapsed);
+            _announcer.ElapsedTime(sw.Elapsed);
         }
     }
 }

src/NzbDrone.Core/Datastore/Migration/Framework/NzbDroneMigrationBase.cs

@@ -1,4 +1,5 @@
 using System;
+using FluentMigrator;
 using NLog;
 using NzbDrone.Common.Instrumentation;
 
@@ -7,10 +8,12 @@ namespace NzbDrone.Core.Datastore.Migration.Framework
     public abstract class NzbDroneMigrationBase : FluentMigrator.Migration
     {
         protected readonly Logger _logger;
+        private readonly MigrationContext _migrationContext;
 
         protected NzbDroneMigrationBase()
         {
             _logger = NzbDroneLogger.GetLogger(this);
+            _migrationContext = (MigrationContext)ApplicationContext;
         }
 
         protected virtual void MainDbUpgrade()
@@ -21,11 +24,32 @@ namespace NzbDrone.Core.Datastore.Migration.Framework
         {
         }
 
+        public int Version
+        {
+            get
+            {
+                var migrationAttribute = (MigrationAttribute)Attribute.GetCustomAttribute(GetType(), typeof(MigrationAttribute));
+                return (int)migrationAttribute.Version;
+            }
+        }
+
+        public MigrationContext Context
+        {
+            get
+            {
+                return _migrationContext;
+            }
+        }
+
         public override void Up()
         {
-            var context = (MigrationContext)ApplicationContext;
 
-            switch (context.MigrationType)
+            if (Context.BeforeMigration != null)
+            {
+                Context.BeforeMigration(this);
+            }
+
+            switch (Context.MigrationType)
             {
                 case MigrationType.Main:
                     MainDbUpgrade();