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diff --git a/src/test/java/com/beust/jcommander/ConverterFactoryTest.java b/src/test/java/com/beust/jcommander/ConverterFactoryTest.java
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+/**
+ * Copyright (C) 2010 the original author or authors.
+ * See the notice.md file distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.beust.jcommander;
+
+import com.beust.jcommander.args.ArgsConverterFactory;
+import com.beust.jcommander.args.ArgsMainParameter1;
+import com.beust.jcommander.args.ArgsMainParameter2;
+import com.beust.jcommander.args.IHostPorts;
+
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Test the converter factory feature.
+ * 
+ * @author cbeust
+ */
+public class ConverterFactoryTest {
+  private static final Map<Class, Class<? extends IStringConverter<?>>> MAP = new HashMap() {{
+    put(HostPort.class, HostPortConverter.class);
+  }};
+
+  private static final IStringConverterFactory CONVERTER_FACTORY = new IStringConverterFactory() {
+
+    public Class<? extends IStringConverter<?>> getConverter(Class forType) {
+      return MAP.get(forType);
+    }
+    
+  };
+
+  @Test
+  public void parameterWithHostPortParameters() {
+    ArgsConverterFactory a = new ArgsConverterFactory();
+    JCommander jc = new JCommander(a);
+    jc.addConverterFactory(CONVERTER_FACTORY);
+    jc.parse("-hostport", "example.com:8080");
+
+    Assert.assertEquals(a.hostPort.host, "example.com");
+    Assert.assertEquals(a.hostPort.port.intValue(), 8080);
+  }
+
+  /**
+   * Test that main parameters can be used with string converters,
+   * either with a factory or from the annotation.
+   */
+  private void mainWithHostPortParameters(IStringConverterFactory f, IHostPorts a) {
+    JCommander jc = new JCommander(a);
+    if (f != null) jc.addConverterFactory(f);
+    jc.parse("a.com:10", "b.com:20");
+    Assert.assertEquals(a.getHostPorts().get(0).host, "a.com");
+    Assert.assertEquals(a.getHostPorts().get(0).port.intValue(), 10);
+    Assert.assertEquals(a.getHostPorts().get(1).host, "b.com");
+    Assert.assertEquals(a.getHostPorts().get(1).port.intValue(), 20);
+  }
+
+  @Test
+  public void mainWithoutFactory() {
+    mainWithHostPortParameters(null, new ArgsMainParameter1());
+  }
+
+  @Test
+  public void mainWithFactory() {
+    mainWithHostPortParameters(CONVERTER_FACTORY, new ArgsMainParameter2());
+  }
+
+}
+