assert (kLineCStart == (aLineCStartPoint.x(), aLineCStartPoint.y()))
assert (kLineCEnd == (aLineCEndPoint.x(), aLineCEndPoint.y()))
#=========================================================================
-# Check that
+# Check that moving line A does not affect lines
+#=========================================================================
+aSession.startOperation()
+aLineAEndPoint.setValue(90., 0.)
+aSession.finishOperation()
+# Check that constarint keep features' values
+assert (kLineAStart == (aLineAStartPoint.x(), aLineAStartPoint.y()))
+assert (kLineAEnd == (aLineAEndPoint.x(), aLineAEndPoint.y()))
+assert (kLineBStart == (aLineBStartPoint.x(), aLineBStartPoint.y()))
+assert (kLineBEnd == (aLineBEndPoint.x(), aLineBEndPoint.y()))
+assert (kLineCStart == (aLineCStartPoint.x(), aLineCStartPoint.y()))
+assert (kLineCEnd == (aLineCEndPoint.x(), aLineCEndPoint.y()))
+#=========================================================================
+# Check that moving line B does not affect lines
#=========================================================================
aSession.startOperation()
aLineBEndPoint.setValue(90., 150.)