[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 9e6fb015f6b84e05be483d9dde9155e6df62a8e2..2817d18e6c14aa8ce6b3a803f2c92e0717088571 100644 (file)
--- a/check/exam_paranoia.cpp
+++ b/check/exam_paranoia.cpp
@@ -6,7 +6,7 @@
  *  these oopses for good, so we run those stupid tests... */
 
 /*
- *  GiNaC Copyright (C) 1999-2010 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2011 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -480,6 +480,48 @@ static unsigned exam_paranoia18()
        return 0;
 }
 
+// Bug in mul::conjugate when factors are evaluated at branch cuts, reported as
+// Sage bug #10964.
+static unsigned exam_paranoia19()
+{
+       symbol a("a");
+       ex e = conjugate(a*sqrt(ex(-2))*sqrt(ex(-3)));
+       ex c = a*conjugate(sqrt(ex(-2)))*conjugate(sqrt(ex(-3)));
+       if (!subs(e-c, a==42).is_zero()) {
+               clog << "subs(a*conjugate(sqrt(-2))*conjugate(sqrt(-3))-conjugate(a*sqrt(-2)*sqrt(-3)),a==42) failed to evaluate to 0\n";
+               return 1;
+       }
+       return 0;
+}
+
+// Bugs in is_polynomial (fixed 2011-05-20 and 2014-07-26).
+static unsigned exam_paranoia20()
+{
+       unsigned result = 0;
+       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";
+               ++result;
+       }
+       ex e2 = sqrt(Pi)*x;
+       if (!e2.is_polynomial(x)) {
+               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;
+}
+
 unsigned exam_paranoia()
 {
        unsigned result = 0;
@@ -504,6 +546,8 @@ unsigned exam_paranoia()
        result += exam_paranoia16();  cout << '.' << flush;
        result += exam_paranoia17();  cout << '.' << flush;
        result += exam_paranoia18();  cout << '.' << flush;
+       result += exam_paranoia19();  cout << '.' << flush;
+       result += exam_paranoia20();  cout << '.' << flush;
        
        return result;
 }