X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=check%2Fexam_paranoia.cpp;h=7a89f9de19e90943dc916a6922f01226690b4af7;hp=5c8ef03ccffbd555256362d19a32f185fee1bef8;hb=38129d5d3880156f6f217f94855553bf4549a960;hpb=9413cd14faaf2980de3884915e22a5beda068ecc

diff --git a/check/exam_paranoia.cpp b/check/exam_paranoia.cpp
index 5c8ef03c..7a89f9de 100644
--- 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) 1999-2016 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
@@ -504,6 +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;
@@ -577,47 +588,51 @@ static unsigned exam_paranoia23()
 	return result;
 }
 
-// Bug in sqrfree_yun (fixed 2016-02-02).
-static unsigned exam_paranoia24()
+// Bug in add ctor
+unsigned exam_paranoia24()
 {
-	unsigned result = 0;
-	symbol x("x");
-	ex e;
+	symbol a("a"), b("b"), c("c");
+	ex e = -a + 2*b + c;
 
-	e = (x-1)*(x+1) - x*x + 1;  // an unexpanded 0...
-	try {
-		ex f = sqrfree(e);
-		if (!f.is_zero()) {
-			clog << "sqrfree(" << e << ") returns " << f << " instead of 0\n";
-			++result;
-		}
-	} catch (const exception &err) {
-		clog << "sqrfree(" << e << ") throws " << err.what() << endl;
-		++result;
+	if (e.diff(c).nops() > 1) {
+		clog << "diff(" << e << ",c) was not fully evaluated.\n";
+		return 1;
 	}
+	return 0;
+}
 
-	e = pow(x-1,3) - expand(pow(x-1,3));  // ...still after differentiating...
-	try {
-		ex f = sqrfree(e);
-		if (!f.is_zero()) {
-			clog << "sqrfree(" << e << ") returns " << f << " instead of 0\n";
-			++result;
-		}
-	} catch (const exception &err) {
-		clog << "sqrfree(" << e << ") throws " << err.what() << endl;
-		++result;
+// 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;
+}
 
-	e = pow(x-1,4) - expand(pow(x-1,4));  // ...and after differentiating twice.
-	try {
-		ex f = sqrfree(e);
-		if (!f.is_zero()) {
-			clog << "sqrfree(" << e << ") returns " << f << " instead of 0\n";
+// 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;
 		}
-	} catch (const exception &err) {
-		clog << "sqrfree(" << e << ") throws " << err.what() << endl;
-		++result;
 	}
 
 	return result;
@@ -649,11 +664,14 @@ 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;
 	
 	return result;
 }