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diff --git a/tests/cxx/string/driver.cxx b/tests/cxx/string/driver.cxx
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+// file      : tests/cxx/string/driver.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2006-2009 Code Synthesis Tools CC
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+// Test xsde::cxx::string string type.
+//
+#include <assert.h>
+
+#include <xsde/cxx/string.hxx>
+
+using xsde::cxx::string;
+
+int
+main ()
+{
+  // Start with un-initialized string.
+  //
+  {
+    string s;
+    assert (s.data () == 0 && s.size () == 0 && s.capacity () == 0);
+  }
+
+  // Test initialization with an empty string.
+  //
+  {
+    string s;
+    s.assign ("", 0);
+    assert (s.size () == 0 && s.capacity () == 64 && s == "");
+  }
+
+  // String starts with at least 64 bytes.
+  //
+  {
+    string s;
+    s.assign ("aaa");
+    assert (s.size () == 3 && s == "aaa" && s.capacity () == 64);
+  }
+
+
+  // If we grow beyond 32 it should be greater of new size and 2*64.
+  //
+  {
+    const char v[] =
+      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" // 32
+      "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
+      "cccccccccccccccccccccccccccccccc";
+
+    string s;
+    s.assign ("aaa");
+    s.assign (v);
+    assert (s.size () == 96 && s == v && s.capacity () == 128);
+  }
+
+  // If we grow beyond 32 it should be greater of new size and 2*32.
+  //
+  {
+    const char v[] =
+      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" // 32
+      "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
+      "cccccccccccccccccccccccccccccccc"
+      "dddddddddddddddddddddddddddddddd"
+      "eeeeeeeeeeeeeeeeeeeeeeeeeeeeeee";
+
+    string s;
+    s.assign ("aaa");
+    s.assign (v);
+    assert (s.size () == 159 && s == v && s.capacity () == 160);
+  }
+
+  // Make sure the new capacity is even.
+  //
+  {
+    const char v[] =
+      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" // 32
+      "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
+      "cccccccccccccccccccccccccccccccc"
+      "dddddddddddddddddddddddddddddddd"
+      "eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee";
+
+    string s;
+    s.assign ("aaa");
+    s.assign (v);
+    assert (s.size () == 160 && s == v && s.capacity () == 162);
+  }
+
+  // Test append
+  //
+  {
+    const char v[] =
+      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" // 32
+      "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
+      "cccccccccccccccccccccccccccccccc"
+      "dddddddddddddddddddddddddddddddd"
+      "eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee";
+
+    string s;
+    s.assign ("aaa");
+    s.append (&v[3]);
+    assert (s.size () == 160 && s == v && s.capacity () == 162);
+  }
+}