2 files changed, 18 insertions, 0 deletions
diff --git a/tests/libsample/modifications.cpp b/tests/libsample/modifications.cpp
index d809e823e..95880d229 100644
--- a/tests/libsample/modifications.cpp
+++ b/tests/libsample/modifications.cpp
@@ -122,6 +122,20 @@ Modifications::sumPointCoordinates(const Point* point)
     return point->x() + point->y();
 }
 
+double
+Modifications::differenceOfPointCoordinates(const Point* pt, bool* ok)
+{
+    if (!pt) {
+        *ok = false;
+        return 0.0;
+    }
+    *ok = true;
+    double result = pt->x() - pt->y();
+    if (result < 0)
+        result = result * -1.0;
+    return result;
+}
+
 bool
 Modifications::nonConversionRuleForArgumentWithDefaultValue(ObjectType** object)
 {
diff --git a/tests/libsample/modifications.h b/tests/libsample/modifications.h
index f17261473..7d5c9123f 100644
--- a/tests/libsample/modifications.h
+++ b/tests/libsample/modifications.h
@@ -106,6 +106,10 @@ public:
     // the test implementation must expect point never to be null.
     int sumPointCoordinates(const Point* point);
 
+    // Modify the return value of a virtual method.
+    virtual double differenceOfPointCoordinates(const Point* pt, bool* ok);
+    double callDifferenceOfPointCoordinates(const Point* pt, bool* ok) { return differenceOfPointCoordinates(pt, ok); }
+
     // Sets an ObjectType in the argument and returns true.
     bool nonConversionRuleForArgumentWithDefaultValue(ObjectType** object = 0);
     ObjectType* getObject() const { return m_object; }