+
+ e=x*x*y;
+ if (!e.has(x*y, has_options::algebraic))
+ { clog << "(x^2*y).has(x*y, has_options::algebraic) erroneously returned false." << endl;
+ ++result;
+ }
+
+ if (e.has(x*y*y, has_options::algebraic))
+ { clog << "(x^2*y).has(x*y*y, has_options::algebraic) erroneously returned true." << endl;
+ ++result;
+ }
+
+ e=x*x*x*y;
+ if (!e.has(x*x, has_options::algebraic))
+ { clog << "(x^3*y).has(x*x, has_options::algebraic) erroneously returned false." << endl;
+ ++result;
+ }
+
+ if (e.has(y*y, has_options::algebraic))
+ { clog << "(x^3*y).has(y*y, has_options::algebraic) erroneously returned true." << endl;
+ ++result;
+ }
+