Added regression test for [ 2857454 ] dereference invalid iterator when lead surrogate was last element of the string

git-svn-id: http://svn.code.sf.net/p/utfcpp/code@101 a809a056-fc17-0410-9590-b4f493f8b08e

test_drivers/regression_tests/r2_2_2/basic_functionality.h

@@ -22,3 +22,24 @@ void id_2852872()
         check(false);
     }
 }
+
+// [ 2857454 ]  dereference invalid iterator when lead surrogate was last element of the string
+void id_2857454()
+{
+    const unsigned short lead_surrogate_last[] = {0x65, 0xd800, 0};
+    vector<char> utf8_result;
+    try
+    {
+        utf8::utf16to8(lead_surrogate_last, lead_surrogate_last + 2, back_inserter(utf8_result));
+        // should throw in the previous line and never get here
+    }
+    catch(utf8::invalid_utf16&)
+    {
+        // this is what we expect
+    }
+    catch(...)
+    {
+        // an unexpected exception happened
+        check(false);
+    }
+}

test_drivers/regression_tests/reg_tests_driver.cpp

@@ -43,4 +43,5 @@ int main()
 // Release 2.2.2
 //r2_2_2/basic_functionality.h
     id_2852872();
+    id_2857454();
 }