[bugfix] fix sqrfree(poly) for zero polynomials in disguise.
[ginac.git] / check / exam_paranoia.cpp
index 579ddc57087b25c06078fd1f566dd207cce9a10b..5c8ef03ccffbd555256362d19a32f185fee1bef8 100644 (file)
@@ -577,6 +577,52 @@ static unsigned exam_paranoia23()
        return result;
 }
 
+// Bug in sqrfree_yun (fixed 2016-02-02).
+static unsigned exam_paranoia24()
+{
+       unsigned result = 0;
+       symbol x("x");
+       ex e;
+
+       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;
+       }
+
+       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;
+       }
+
+       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";
+                       ++result;
+               }
+       } catch (const exception &err) {
+               clog << "sqrfree(" << e << ") throws " << err.what() << endl;
+               ++result;
+       }
+
+       return result;
+}
+
 unsigned exam_paranoia()
 {
        unsigned result = 0;
@@ -607,6 +653,7 @@ unsigned exam_paranoia()
        result += exam_paranoia21();  cout << '.' << flush;
        result += exam_paranoia22();  cout << '.' << flush;
        result += exam_paranoia23();  cout << '.' << flush;
+       result += exam_paranoia24();  cout << '.' << flush;
        
        return result;
 }