[bugfix] ex::is_polynomial(x): fix miscomputations

[ginac.git] / check / exam_paranoia.cpp

diff --git a/check/exam_paranoia.cpp b/check/exam_paranoia.cpp
index 52d261c8b46712962084e373de2de19ae28603c2..2817d18e6c14aa8ce6b3a803f2c92e0717088571 100644 (file)
--- a/check/exam_paranoia.cpp
+++ b/check/exam_paranoia.cpp
@@ -494,11 +494,11 @@ static unsigned exam_paranoia19()
        return 0;
 }
 
-// Bug in expairseq::is_polynomial (fixed 2011-05-20).
+// Bugs in is_polynomial (fixed 2011-05-20 and 2014-07-26).
 static unsigned exam_paranoia20()
 {
        unsigned result = 0;
-       symbol x("x");
+       symbol x("x"), y("y");
        ex e1 = sqrt(x*x+1)*sqrt(x+1);
        if (e1.is_polynomial(x)) {
                clog << "sqrt(x*x+1)*sqrt(x+1) is wrongly reported to be a polynomial in x\n";
@@ -509,6 +509,16 @@ static unsigned exam_paranoia20()
                clog << "sqrt(Pi)*x is wrongly reported to be no polynomial in x\n";
                ++result;
        }
+       ex e3 = sqrt(x);
+       if (!e3.is_polynomial(y)) {
+               clog << "sqrt(x) is wrongly reported to be no polynomial in y\n";
+               ++result;
+       }
+       ex e4 = (1+y)/(2+x);
+       if (e4.is_polynomial(x)) {
+               clog << "(1+y)/(2+x) is wrongly reported to be a polynomial in x\n";
+               ++result;
+       }
        return result;
 }