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diff --git a/src/test/java/com/beust/jcommander/DefaultValueTest.java b/src/test/java/com/beust/jcommander/DefaultValueTest.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.internal.Lists;
+import com.beust.jcommander.internal.Sets;
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * Test behaviour of default parameter values
+ * @author rodionmoiseev
+ */
+public class DefaultValueTest {
+  @Test
+  public void emptyDefaultValueForListParameterStaysEmptyIfNotAssignedOrIsSetOtherwise() {
+    MyOptsWithEmptyDefaults opts = new MyOptsWithEmptyDefaults();
+    JCommander cmd = new JCommander(opts);
+    cmd.parse(new String[]{"-a", "anotherValue"});
+    Assert.assertEquals(opts.list.size(), 1);
+    Assert.assertEquals(opts.list.get(0), "anotherValue");
+    Assert.assertEquals(opts.set.size(), 0);
+  }
+
+  @Test
+  public void defaultValueForListParametersGetsOverwrittenWithSpecifiedValueOrStaysAsDefaultOtherwise() {
+    MyOptsWithDefaultValues opts = new MyOptsWithDefaultValues();
+    JCommander cmd = new JCommander(opts);
+    cmd.parse(new String[]{"-a", "anotherValue"});
+    Assert.assertEquals(opts.list.size(), 1);
+    Assert.assertEquals(opts.list.get(0), "anotherValue");
+    Assert.assertEquals(opts.set.size(), 1);
+    Assert.assertEquals(opts.set.iterator().next(), "defaultValue");
+  }
+
+  @Test
+  public void anyNumberOfValuesCanBeSetToListParameters_ForEmptyDefaults(){
+    MyOptsWithEmptyDefaults opts = new MyOptsWithEmptyDefaults();
+    testSettingMultipleValuesToListTypeParameters(opts);
+  }
+
+  @Test
+  public void anyNumberOfValuesCanBeSetToListParameters_ForNonEmptyDefaults(){
+    MyOptsWithDefaultValues opts = new MyOptsWithDefaultValues();
+    testSettingMultipleValuesToListTypeParameters(opts);
+  }
+
+  private void testSettingMultipleValuesToListTypeParameters(MyOpts opts) {
+    JCommander cmd = new JCommander(opts);
+    cmd.parse(new String[]{"-a", "anotherValue", "-a", "anotherValue2",
+                           "-b", "anotherValue3", "-b", "anotherValue4"});
+    Assert.assertEquals(opts.list.size(), 2);
+    Assert.assertEquals(opts.list.get(0), "anotherValue");
+    Assert.assertEquals(opts.list.get(1), "anotherValue2");
+    Assert.assertEquals(opts.set.size(), 2);
+    Iterator<String> arg2it = opts.set.iterator();
+    Assert.assertEquals(arg2it.next(), "anotherValue3");
+    Assert.assertEquals(arg2it.next(), "anotherValue4");
+  }
+
+  public static class MyOpts {
+    @Parameter(names = "-a")
+    public List<String> list;
+    @Parameter(names = "-b")
+    public Set<String> set;
+  }
+
+  public static final class MyOptsWithDefaultValues extends MyOpts {
+    public MyOptsWithDefaultValues(){
+      this.list = singletonList("defaultValue");
+      this.set = singletonSet("defaultValue");
+    }
+  }
+
+  public static final class MyOptsWithEmptyDefaults extends MyOpts {
+    public MyOptsWithEmptyDefaults(){
+      this.list = Lists.newArrayList();
+      this.set = Sets.newLinkedHashSet();
+    }
+  }
+
+  public static final List<String> singletonList(String value) {
+    List<String> list = Lists.newArrayList();
+    list.add(value);
+    return list;
+  }
+
+  public static final Set<String> singletonSet(String value){
+    Set<String> set = Sets.newLinkedHashSet();
+    set.add(value);
+    return set;
+  }
+}