Tests¶
Every Goldilocks test is derived from the Test abstract class, which has multiple functions that may be overloaded.
Test()
¶
This is the class’s construtor. Derived class must call the Test constructor and pass the name and docstring as follows:
SomeTest()
: Test("test_name", "Some test documentation string here.")
{}
pre()
¶
This is an optional function that sets up the test to be run. In cases where
a test is run multiple consecutive times, it is only called once. Thus, it
must be possible to call pre()
once, and then successfully call run()
any number of times.
The function must return true if setup was successful, and false otherwise, to make sure the appropriate actions are taken.
prefail()
¶
This is an optional function that tears down the test after a failed call to
pre()
. It is the only function to be called in that situation, and it
will not be called under any other circumstances. It has no fail handler
itself, so prefail()
must succeed in any reasonable circumstance.
The function returns nothing.
run()
¶
This is a required function for any test. It contains all the code for
the test run itself. After pre()
is called once (optionally), run()
must be able to handle any number of consecutive calls to itself.
There must always be a version of run()
that accepts no arguments.
However, it is not uncommon to overload run()
to accept a scenario string
(part of the LIT Standard) for generating a particular scenario, or
prompting a random one to be generated.
The function should return true if the test succeeded, and false if it failed.
Important
run()
(with no arguments) should be consistent in its
success. Assuming pre() was successful, if the first consecutive call to
run()
is successful, all subsequent calls to run() must also be successful.
This is vital to the benchmarker functions, as they can call a single test
up to 10,000 times. One consideration, then, is that run() should only use
one scenario in a single lifetime, unless explicitly instructed by its
function arguments to do otherwise.
janitor()
¶
This is called after each repeat of run()
during benchmarking and
comparative benchmarking. It is designed to perform cleanup in between
run()
calls, but not to perform first time setup (pre())
or end of
testing (post()
) cleanup. Must return a boolean indicating success.
Janitor is always called before each call to run()
or run_optimized()
,
including before the first run()
call.
post()
¶
This is an optional function which is called at the end of a test’s normal
lifetime. It is the primary teardown function, generally responsible for
cleaning up whatever was created in pre()
, janitor()
and run()
.
It is normally only called if run()
returns true, although it will be called
at the end of benchmarking regardless of run()
’s success.
This function returns nothing. It has no fail handler itself,
so post()
should succeed in all reasonable circumstances.
postmortem()
¶
This is an optional teardown function which is usually called if a test fails
(run()
or run_optimized()
returns false
). It is responsible for cleaning
up whatever was created in pre()
and run()
, much like post()
is, but
again only for those scenarios where run()
fails.
This function returns nothing. If not defined, calls post()
.
It has no fail handler itself, so postmortem()
should succeed
in all reasonable circumstances.
Creating a Test¶
Creating a test is as simple as creating a class that inherits from
Test (from goldilocks.hpp)
, which is a pure virtual base class.
Important
The constructor and destructor must obviously be defined, however, it is not recommended that they actually do anything - all setup and teardown tasks must be handled by the other functions in order to ensure proper functionality - a test instance is defined once when Goldilocks is set up, but it is highly likely to have multiple lifetimes.
Only bool run()
must be defined in a test class. The rest of the
functions are already defined (they do nothing other than return true),
so you only need to define them if you require them to do something.
The following example exhibits a properly-defined, though overly
simplistic, test. In reality, we could have skipped pre()
, prefail()
,
janitor()
, postmortem()
, and post()
, but they are defined to
demonstrate their behavior.
#include <iochannel.hpp>
#include <goldilocks.hpp>
class TestFoo : public Test
{
public:
TestFoo(){}
testdoc_t get_title()
{
return "Example Test";
}
testdoc_t get_docs()
{
return "This is the docstring for our example test."
}
bool pre()
{
ioc << cat_testing << "Do Pre Stuff" << IOCtrl::endl;
return true;
}
bool prefail()
{
ioc << cat_testing << "Do Prefail Stuff" << IOCtrl::endl;
return true;
}
bool run()
{
ioc << cat_testing << "Do Test Stuff" << IOCtrl::endl;
char str[5000] = {'\0'};
for(int a=0;a<5000;a++)
{
str[a] = 'A';
}
return true;
}
bool janitor()
{
ioc << cat_testing << "Do Janitorial Stuff" << IOCtrl::endl;
return true;
}
bool postmortem()
{
ioc << cat_testing << "Do Postmortem Stuff" << IOCtrl::endl;
return true;
}
bool post()
{
ioc << cat_testing << "Do Post Stuff" << IOCtrl::endl;
return true;
}
~TestFoo(){}
};
Registering a Test¶
Registering a test with Goldilocks is a trivial task, thanks to its
register_test()
function. Once a test class has been defined, as above,
simply register it via…
//Assuming testmanager is our instance of the Goldilocks test manager.
testmanager.register_test("TestFoo", new TestFoo);
Goldilocks will now actually own the instance of TestFoo
, and automatically
handle its deletion at the proper time.
Warning
Goldilocks actually requires exclusive ownership of each test object registered to it - thus, you should always pass the new declaration as the second argument. If you create the object first, and then pass the pointer, you run a high risk of a segfault or other undefined behavior.
The test can now be called by name using Goldilocks’ various functions. (See below.)
You can also optionally register a comparative test for benchmarking, which will be run against the main test in the benchmarker.
//Assuming testmanager is our instance of the Goldilocks test manager.
testmanager.register_test("TestFoo", new TestFoo, new TestBar);
Running a Test¶
Once a test is registered with Goldilocks, running it is quite easy.
//Run the test once.
testmanager.run_test("TestFoo");
//Benchmark TestFoo on 100 repetitions.
testmanager.run_benchmark("TestFoo", 100);