diff --git a/tests/strings/strings.cpp b/tests/strings/strings.cpp
index 98e6619a80..e1d7262bb9 100644
--- a/tests/strings/strings.cpp
+++ b/tests/strings/strings.cpp
@@ -35,6 +35,7 @@ private:
         CPPUNIT_TEST( String );
         CPPUNIT_TEST( PChar );
         CPPUNIT_TEST( Format );
+        CPPUNIT_TEST( FormatUnicode );
         CPPUNIT_TEST( Constructors );
         CPPUNIT_TEST( StaticConstructors );
         CPPUNIT_TEST( Extraction );
@@ -68,6 +69,7 @@ private:
     void String();
     void PChar();
     void Format();
+    void FormatUnicode();
     void Constructors();
     void StaticConstructors();
     void Extraction();
@@ -174,6 +176,20 @@ void StringTestCase::Format()
     );
 }
 
+void StringTestCase::FormatUnicode()
+{
+#if wxUSE_UNICODE
+    const char *UNICODE_STR = "Iestat\xC4\xAB %i%i";
+    //const char *UNICODE_STR = "Iestat\xCC\x84 %i%i";
+
+    wxString fmt = wxString::FromUTF8(UNICODE_STR);
+    wxString s = wxString::Format(fmt, 1, 1);
+    wxString expected(fmt);
+    expected.Replace("%i", "1");
+    CPPUNIT_ASSERT_EQUAL( expected, s );
+#endif // wxUSE_UNICODE
+}
+
 void StringTestCase::Constructors()
 {
     CPPUNIT_ASSERT_EQUAL( "", wxString('Z', 0) );