A bare-bones transaction test.

Seems to be working...

src/main/java/com/samskivert/depot/DepotRepository.java

@@ -115,6 +115,14 @@ public abstract class DepotRepository
         CONTENTS
     }
 
+    /**
+     * Returns the persistence context used by this repository.
+     */
+    public PersistenceContext ctx ()
+    {
+        return _ctx;
+    }
+
     /**
      * Loads the persistent object that matches the specified primary key.
      *

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

@@ -12,7 +12,7 @@ import org.junit.Test;
 import static org.junit.Assert.*;
 
 /**
- * Tests simple create/read/update/delete behaviors. 
+ * Tests simple create/read/update/delete behaviors.
  */
 public class CrudTest extends TestBase
 {

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

@@ -0,0 +1,45 @@
+//
+// Depot library - a Java relational persistence library
+// https://github.com/threerings/depot/blob/master/LICENSE
+
+package com.samskivert.depot;
+
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class TransactionTest extends TestBase
+{
+    @Test public void testSuccessfulCommit () {
+        Transaction tx = Transaction.start(_repo.ctx());
+        TestRecord in = createTestRecord(1);
+        _repo.insert(in);
+        tx.commit();
+
+        TestRecord out = _repo.loadNoCache(in.recordId);
+        assertNotNull(out); // we got a result
+        assertTrue(in != out); // it didn't come from the cache
+
+        // make sure all of the fields were marshalled and unmarshalled correctly
+        assertTestRecordEquals(in, out);
+
+        // finally clean up after ourselves (because other tests share this database)
+        _repo.delete(TestRecord.getKey(in.recordId));
+        assertNull(_repo.loadNoCache(in.recordId));
+    }
+
+    @Test public void testRollback () {
+        Transaction tx = Transaction.start(_repo.ctx());
+        TestRecord in1 = createTestRecord(1);
+        _repo.insert(in1);
+        TestRecord in2 = createTestRecord(2);
+        _repo.insert(in2);
+        tx.rollback();
+
+        assertNull(_repo.loadNoCache(in1.recordId)); // we should get no result
+        assertNull(_repo.loadNoCache(in2.recordId)); // we should get no result
+    }
+
+    // the HSQL in-memory database persists for the lifetime of the VM, which means we have to
+    // clean up after ourselves in every test; thus we go ahead and share a repository
+    protected TestRepository _repo = createTestRepository();
+}