7 files changed, 47 insertions, 4 deletions
diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index a172b92..8b237bf 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -10,6 +10,10 @@
         lookups can now be done with multi-column indexes using only some of
         the columns in the index.
       </action>
+      <action dev="jahlborn" type="update" system="GitHubPullRequests"
+              issue="2">
+        Cover the GENERIC_JET4 format in unit tests, thanks to Gord Thompson.
+      </action>
     </release>
     <release version="2.1.6" date="2016-11-29">
       <action dev="jahlborn" type="update" system="SourceForge2Features"
diff --git a/src/main/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java b/src/main/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java
index ac253fb..17741a5 100644
--- a/src/main/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java
+++ b/src/main/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java
@@ -1951,7 +1951,7 @@ public class DatabaseImpl implements Database
    * Copies the given InputStream to the given channel using the most
    * efficient means possible.
    */
-  private static void transferFrom(FileChannel channel, InputStream in)
+  static void transferFrom(FileChannel channel, InputStream in)
     throws IOException
   {
     ReadableByteChannel readChannel = Channels.newChannel(in);
diff --git a/src/test/java/com/healthmarketscience/jackcess/DatabaseTest.java b/src/test/java/com/healthmarketscience/jackcess/DatabaseTest.java
index 6a6fd34..025e180 100644
--- a/src/test/java/com/healthmarketscience/jackcess/DatabaseTest.java
+++ b/src/test/java/com/healthmarketscience/jackcess/DatabaseTest.java
@@ -742,7 +742,9 @@ public class DatabaseTest extends TestCase
           Arrays.asList("MSysObjects", "MSysQueries", "MSysACES",
                         "MSysRelationships"));
       
-      if (fileFormat.ordinal() < FileFormat.V2003.ordinal()) {
+      if (fileFormat == FileFormat.GENERIC_JET4) {
+        assertNull("file format: " + fileFormat, db.getSystemTable("MSysAccessObjects"));
+      } else if (fileFormat.ordinal() < FileFormat.V2003.ordinal()) {
         assertNotNull("file format: " + fileFormat, db.getSystemTable("MSysAccessObjects"));
         sysTables.add("MSysAccessObjects");
       } else {
diff --git a/src/test/java/com/healthmarketscience/jackcess/PropertiesTest.java b/src/test/java/com/healthmarketscience/jackcess/PropertiesTest.java
index a5ec859..89ab4c4 100644
--- a/src/test/java/com/healthmarketscience/jackcess/PropertiesTest.java
+++ b/src/test/java/com/healthmarketscience/jackcess/PropertiesTest.java
@@ -24,7 +24,6 @@ import java.util.List;
 import java.util.UUID;
 
 import static com.healthmarketscience.jackcess.Database.*;
-import static com.healthmarketscience.jackcess.DatabaseTest.*;
 import com.healthmarketscience.jackcess.impl.DatabaseImpl;
 import static com.healthmarketscience.jackcess.impl.JetFormatTest.*;
 import com.healthmarketscience.jackcess.impl.PropertyMapImpl;
@@ -349,6 +348,12 @@ public class PropertiesTest extends TestCase
   public void testCreateDbProperties() throws Exception
   {
     for(FileFormat ff : SUPPORTED_FILEFORMATS) {
+
+      if(ff == FileFormat.GENERIC_JET4) {
+        // weirdo format, no properties
+        continue;
+      }
+      
       File file = TestUtil.createTempFile(false);
       Database db = new DatabaseBuilder(file)
         .setFileFormat(ff)
diff --git a/src/test/java/com/healthmarketscience/jackcess/TestUtil.java b/src/test/java/com/healthmarketscience/jackcess/TestUtil.java
index c6856bc..ab3a8d4 100644
--- a/src/test/java/com/healthmarketscience/jackcess/TestUtil.java
+++ b/src/test/java/com/healthmarketscience/jackcess/TestUtil.java
@@ -41,6 +41,7 @@ import com.healthmarketscience.jackcess.impl.ByteUtil;
 import com.healthmarketscience.jackcess.impl.DatabaseImpl;
 import com.healthmarketscience.jackcess.impl.IndexData;
 import com.healthmarketscience.jackcess.impl.IndexImpl;
+import com.healthmarketscience.jackcess.impl.JetFormatTest;
 import com.healthmarketscience.jackcess.impl.JetFormatTest.TestDB;
 import com.healthmarketscience.jackcess.impl.RowIdImpl;
 import com.healthmarketscience.jackcess.impl.RowImpl;
@@ -122,8 +123,32 @@ public class TestUtil
     throws Exception 
   {
     FileChannel channel = (inMem ? MemFileChannel.newChannel() : null);
+
+    if (fileFormat == FileFormat.GENERIC_JET4) {
+      // while we don't support creating GENERIC_JET4 as a jackcess feature,
+      // we do want to be able to test these types of dbs
+      InputStream inStream = null;
+      OutputStream outStream = null;
+      try {
+        inStream = TestUtil.class.getClassLoader()
+          .getResourceAsStream("emptyJet4.mdb");
+        File f = createTempFile(keep);
+        if (channel != null) {
+          JetFormatTest.transferFrom(channel, inStream);
+        } else {
+          ByteUtil.copy(inStream, outStream = new FileOutputStream(f));
+          outStream.close();
+        }
+        return new DatabaseBuilder(f)
+          .setAutoSync(getTestAutoSync()).setChannel(channel).open();
+      } finally {
+        ByteUtil.closeQuietly(inStream);
+        ByteUtil.closeQuietly(outStream);
+      }
+    }
+     
     return new DatabaseBuilder(createTempFile(keep)).setFileFormat(fileFormat)
-      .setAutoSync(getTestAutoSync()).setChannel(channel).create();
+        .setAutoSync(getTestAutoSync()).setChannel(channel).create();
   }
 
 
diff --git a/src/test/java/com/healthmarketscience/jackcess/impl/JetFormatTest.java b/src/test/java/com/healthmarketscience/jackcess/impl/JetFormatTest.java
index 4efbd60..d2ebd41 100644
--- a/src/test/java/com/healthmarketscience/jackcess/impl/JetFormatTest.java
+++ b/src/test/java/com/healthmarketscience/jackcess/impl/JetFormatTest.java
@@ -1,6 +1,8 @@
 package com.healthmarketscience.jackcess.impl;
 
 import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
 import java.nio.channels.FileChannel;
 import java.nio.channels.NonWritableChannelException;
 import java.util.ArrayList;
@@ -263,4 +265,9 @@ public class JetFormatTest extends TestCase {
     }
   }
 
+  public static void transferFrom(FileChannel channel, InputStream in)
+    throws IOException
+  {
+    DatabaseImpl.transferFrom(channel, in);
+  }
 }
diff --git a/src/test/resources/emptyJet4.mdb b/src/test/resources/emptyJet4.mdb
new file mode 100644
index 0000000..7367d01
--- /dev/null
+++ b/src/test/resources/emptyJet4.mdb