[PATCH] Make ex::operator[] const dispatch to basic::operator[] const.

[ginac.git] / check / exam_paranoia.cpp

diff --git a/check/exam_paranoia.cpp b/check/exam_paranoia.cpp
index ad7ee8d25facc53da8d7022113da134c3f8cb986..af36238bbe9889688772901704cf80c68178a0d0 100644 (file)
--- a/check/exam_paranoia.cpp
+++ b/check/exam_paranoia.cpp
@@ -1,12 +1,12 @@
 /** @file exam_paranoia.cpp
  *
  *  This set of tests checks for some of GiNaC's oopses which showed up during
- *  development.  Things were evaluated wrongly and so.  Such a sick behaviour
+ *  development.  Things were evaluated wrongly and so.  Such a sick behavior
  *  shouldn't occur any more.  But we are paranoic and we want to exclude these
  *  these oopses for good, so we run those stupid tests... */
 
 /*
- *  GiNaC Copyright (C) 1999-2015 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2021 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
@@ -440,16 +440,26 @@ static unsigned exam_paranoia17()
 }
 
 // Bug in add::eval() could result in numeric terms not being collected into
-// the overall coefficient. Fixed on Sep 22, 2010
+// the overall coefficient. Fixed first on Sep 22, 2010 and again on Dec 17 2015
 static unsigned exam_paranoia18()
 {
+       unsigned result = 0;
+
        ex sqrt2 = sqrt(ex(2));
-       ex e = 1+2*(sqrt2+1)*(sqrt2-1);
-       if ( e.real_part() != 3 ) {
+       ex e1 = 1 + 2*(sqrt2+1)*(sqrt2-1);
+       if (e1.real_part() != 3) {
                clog << "real_part(1+2*(sqrt(2)+1)*(sqrt(2)-1)) failed to evaluate to 3\n";
-               return 1;
+               ++result;
        }
-       return 0;
+
+       ex sqrt3 = sqrt(ex(3));
+       ex e2 = 2 + 2*(sqrt2+1)*(sqrt2-1) - 2*(sqrt3+1)*(sqrt3-1);
+       if (e2.real_part() != 0) {
+               clog << "real_part(2+2*(sqrt(2)+1)*(sqrt(2)-1)-3*(sqrt(3)+1)*(sqrt(3)-1)) failed to evaluate to 0\n";
+               ++result;
+       }
+
+       return result;
 }
 
 // Bug in mul::conjugate when factors are evaluated at branch cuts, reported as
@@ -494,6 +504,17 @@ static unsigned exam_paranoia20()
        return result;
 }
 
+static unsigned exam_mul_info()
+{
+       symbol x("x"), y("y");
+       ex e = x*y;
+       if (!e.info(info_flags::indefinite)) {
+               clog << "eek, product of two symbols is NOT indefinite\n";
+               return 1;
+       }
+       return 0;
+}
+
 static unsigned is_polynomial_false_positive()
 {
        unsigned result = 0;
@@ -567,6 +588,77 @@ static unsigned exam_paranoia23()
        return result;
 }
 
+// Bug in add ctor
+unsigned exam_paranoia24()
+{
+       symbol a("a"), b("b"), c("c");
+       ex e = -a + 2*b + c;
+
+       if (e.diff(c).nops() > 1) {
+               clog << "diff(" << e << ",c) was not fully evaluated.\n";
+               return 1;
+       }
+       return 0;
+}
+
+// Bug in partial fraction expansion
+unsigned exam_paranoia25()
+{
+       symbol x("x");
+       ex ex1=pow(x,4)/(x-1)/4;
+       ex ex2=sqrfree_parfrac(ex1,x);
+       ex e = (ex1-ex2).normal();
+
+       if (! e.is_zero()) {
+               clog << "partial fraction expansion of " << ex1 << " produces error.\n";
+               return 1;
+       }
+       return 0;
+}
+
+// Bug in power expansion
+unsigned exam_paranoia26()
+{
+       unsigned result = 0;
+       symbol x("x"), y("y"), a("a");
+       possymbol s("s"), t("t");
+       exmap pwrs =
+         { {pow((x+1)*(y-2)*(s-3)*(t+4), a), pow((x+1)*(y-2)*(s-3), a)*pow(t+4, a)},
+           {pow(2*(x+1)*(y-2)*(s-3)*(t+4), a), pow(2,a)*pow((x+1)*(y-2)*(s-3), a)*pow(t+4, a)},
+           {pow(-(x+1)*(y-2)*(s-3)*(t+4), a), pow(-(x+1)*(y-2)*(s-3), a)*pow(t+4, a)},
+           {pow(-2*(x+1)*(y-2)*(s-3)*(t+4), a), pow(2,a)*pow(-(x+1)*(y-2)*(s-3), a)*pow(t+4, a)} };
+
+       for (auto e : pwrs) {
+               if (! (e.first.expand()).is_equal(e.second) ) {
+                       clog << "power expansion of " << e.first << " produces error.\n";
+                       ++result;
+               }
+       }
+
+       return result;
+}
+
+// Bug in collect()
+// cf. https://www.ginac.de/pipermail/ginac-list/2021-March/002337.html
+static unsigned exam_collect_multiply_referenced_lst()
+{
+        unsigned result = 0;
+        symbol x("x"), y("y");
+        ex a = x + y;
+        ex l = lst{x, y};
+        ex l2 = l;  // make l a multiply referenced object
+
+        try {
+                ex b = collect(a, l);
+        } catch (const std::runtime_error & e) {
+                clog << "collect(" << ", " << l << ") threw a runtime_error("
+                     << e.what() << ")" << endl;
+                ++result;
+        }
+
+        return result;
+}
+
 unsigned exam_paranoia()
 {
        unsigned result = 0;
@@ -593,10 +685,15 @@ unsigned exam_paranoia()
        result += exam_paranoia18();  cout << '.' << flush;
        result += exam_paranoia19();  cout << '.' << flush;
        result += exam_paranoia20();  cout << '.' << flush;
+       result += exam_mul_info(); cout << '.' << flush;
        result += is_polynomial_false_positive(); cout << '.' << flush;
        result += exam_paranoia21();  cout << '.' << flush;
        result += exam_paranoia22();  cout << '.' << flush;
        result += exam_paranoia23();  cout << '.' << flush;
+       result += exam_paranoia24();  cout << '.' << flush;
+       result += exam_paranoia25();  cout << '.' << flush;
+       result += exam_paranoia26();  cout << '.' << flush;
+       result += exam_collect_multiply_referenced_lst();  cout << '.' << flush;
        
        return result;
 }