diff --git a/src/test/test_data_buffer.cpp b/src/test/test_data_buffer.cpp
index 8aef614..872785a 100644
--- a/src/test/test_data_buffer.cpp
+++ b/src/test/test_data_buffer.cpp
@@ -10,6 +10,7 @@ class TestDataBuffer : public CppUnit::TestFixture
 {
     CPPUNIT_TEST_SUITE(TestDataBuffer);
     CPPUNIT_TEST(testEmpty);
+    CPPUNIT_TEST(testWithInitialContent);
     CPPUNIT_TEST(testSingleWriteMultiRead);
     CPPUNIT_TEST(testMultiWriteSingleRead);
     CPPUNIT_TEST(testReadMoreThanAvailable);
@@ -22,6 +23,11 @@ class TestDataBuffer : public CppUnit::TestFixture
         CPPUNIT_ASSERT_THROW(db.read(3), pcs::Exception);
     }
 
+    void testWithInitialContent() {
+        DataBuffer db(ByteArray("foobar", 6));
+        CPPUNIT_ASSERT_EQUAL(ByteArray("foobar", 6), db.read(6));
+    }
+
     void testSingleWriteMultiRead() {
         DataBuffer db;
         CPPUNIT_ASSERT_NO_THROW(db.write(ByteArray("foobar", 6)));