Implemented a framework for testing database migrations. Unfortunately, I am

not filled with ideas on how to programmatically verify that the primary key
migration I've just created a test for is actually working. I can visually
inspect the logging output, but that's not useful for catching potential future
regressions.

src/test/java/com/samskivert/depot/MigrationTest.java

@@ -0,0 +1,113 @@
+//
+// $Id$
+//
+// Depot library - a Java relational persistence library
+// Copyright (C) 2006-2010 Michael Bayne and Pär Winzell
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.samskivert.depot;
+
+import java.util.Set;
+
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+import com.samskivert.jdbc.DatabaseLiaison;
+import com.samskivert.util.RandomUtil;
+
+import com.samskivert.depot.annotation.Id;
+import com.samskivert.depot.impl.Modifier;
+
+/**
+ * Tests various migrations.
+ */
+public class MigrationTest extends TestBase
+{
+    public static class PKMigrationRecord extends PersistentRecord
+    {
+        public static final int SCHEMA_VERSION = 2;
+        @Id public int id;
+        /* @Id removed */ public String stringId;
+    }
+
+    @Test
+    public void testPKMigration ()
+    {
+        PersistenceContext pctx = createPersistenceContext("pkmig", PK_DUMP);
+        executeSQL(pctx, PK_INIT); // now that the schema is created, we can populate
+        DepotRepository repo = createRepository(pctx, PKMigrationRecord.class);
+        // trigger the execution of the migrations
+        pctx.initializeRepositories(true);
+    }
+
+    // @Test
+    public void generateDatabaseDump ()
+    {
+        PersistenceContext pctx = createPersistenceContext();
+        DepotRepository repo = createRepository(pctx, PKMigrationRecord.class);
+
+        for (int ii = 1; ii <= 5; ii++) {
+            PKMigrationRecord record = new PKMigrationRecord();
+            record.id = ii;
+            record.stringId = ""+ii;
+            repo.insert(record);
+        }
+
+        executeSQL(pctx, "script 'dump.sql'");
+    }
+
+    protected void executeSQL (PersistenceContext ctx, final String sql)
+    {
+        ctx.invoke(new Modifier.Simple() {
+            protected String createQuery (DatabaseLiaison liaison) {
+                return sql;
+            }
+        });
+    }
+
+    protected DepotRepository createRepository (
+        PersistenceContext pctx, final Class<? extends PersistentRecord> pclass)
+    {
+        return new DepotRepository(pctx) {
+            @Override
+            protected void getManagedRecords (Set<Class<? extends PersistentRecord>> classes) {
+                classes.add(pclass);
+            }
+        };
+    }
+
+    protected static final String[] PK_DUMP = {
+        "CREATE MEMORY TABLE PUBLIC.\"DepotSchemaVersion\"(" +
+        "\"persistentClass\" VARCHAR(255) NOT NULL PRIMARY KEY," +
+        "\"version\" INTEGER NOT NULL," +
+        "\"migratingVersion\" INTEGER NOT NULL," +
+        "UNIQUE(\"persistentClass\"))",
+
+        "CREATE MEMORY TABLE PUBLIC.\"MigrationTest$PKMigrationRecord\"(" +
+        "\"id\" INTEGER DEFAULT 0 NOT NULL," +
+        "\"stringId\" VARCHAR(255) NOT NULL," +
+        "PRIMARY KEY(\"id\",\"stringId\"))",
+
+        "INSERT INTO \"DepotSchemaVersion\" VALUES('MigrationTest$PKMigrationRecord',1,0)"
+    };
+
+    protected static final String PK_INIT =
+        "INSERT INTO \"MigrationTest$PKMigrationRecord\" VALUES(1,'1')\n" +
+        "INSERT INTO \"MigrationTest$PKMigrationRecord\" VALUES(2,'2')\n" +
+        "INSERT INTO \"MigrationTest$PKMigrationRecord\" VALUES(3,'3')\n" +
+        "INSERT INTO \"MigrationTest$PKMigrationRecord\" VALUES(4,'4')\n" +
+        "INSERT INTO \"MigrationTest$PKMigrationRecord\" VALUES(5,'5')\n";
+}