I have the following output from a Google Test unit test:
UnitTests.cc:56: Failure
Value of: LineSegment2i(Vector2i(-10,0), Vector2i(-10,10)).toLine()
Actual: 24-byte object <00-00 00-00 00-00 24-C0 00-00 00-00 00-00 00-00 00-00 2F-2B FF-7F 00-00>
Expected: Line(10, 3.14159265358979323846)
Which is: 24-byte object <00-00 00-00 00-00 24-40 18-2D 44-54 FB-21 09-40 00-00 64-00 00-00 00-00>
[ FAILED ] LineSegmentTests.toLine (1 ms)
That hexadecimal output string isn't very useful. Is there something I can add to the Line class (for which an equality test is failing) to provide more helpful errors in such cases?
The class in question has overridden the << operator as a member function:
std::ostream& operator<<(std::ostream& stream) const
{
return stream << "Line (radius=" << d_radius << " theta=" << d_theta << ")";
}
You can see that this works for the 'Expected' line, but not the 'Actual' line. This statement is untrue — the test shown comes from the parameter of the TEST macro.
In order to print custom types you could "teach" Google Test how to print your custom types which as described in the section Teaching Google Test How to Print Your Values.