Test case for Erlang distribution random variable stream generator. More...

Inheritance diagram for ns3::test::RandomVariable::ErlangTestCase:

Collaboration diagram for ns3::test::RandomVariable::ErlangTestCase:

Public Member Functions
	ErlangTestCase ()

double	ChiSquaredTest (Ptr< RandomVariableStream > rng) const
	Compute the chi square value from a random variable. More...

Public Member Functions inherited from ns3::test::RandomVariable::TestCaseBase
	TestCaseBase (std::string name)
	Constructor. More...

double	Average (Ptr< RandomVariableStream > rng) const
	Compute the average of a random variable. More...

double	ChiSquared (gsl_histogram *h, const std::vector< double > &expected, Ptr< RandomVariableStream > rng) const
	Compute the chi squared value of a sampled distribution compared to the expected distribution. More...

double	ChiSquaredsAverage (const RngGeneratorBase *generator, std::size_t nRuns) const
	Average the chi squared value over some number of runs, each run with a new instance of the random number generator. More...

void	SetTestSuiteSeed (void)
	Set the seed used for this test suite. More...

std::vector< double >	UniformHistogramBins (gsl_histogram *h, double start, double end, bool underflow=true, bool overflow=true) const
	Configure a GSL histogram with uniform bins, with optional under/over-flow bins. More...

Public Member Functions inherited from ns3::TestCase
	TestCase (const TestCase &)=delete

virtual	~TestCase ()
	Destructor. More...

std::string	GetName (void) const

TestCase &	operator= (const TestCase &)=delete

Private Member Functions
virtual void	DoRun (void)
	Implementation to actually run this TestCase. More...

Static Private Attributes
static constexpr double	TOLERANCE {1e-2}
	Tolerance for testing rng values against expectation, as a fraction of mean value. More...

Additional Inherited Members
Public Types inherited from ns3::TestCase
enum	TestDuration { QUICK = 1 , EXTENSIVE = 2 , TAKES_FOREVER = 3 }
	How long the test takes to execute. More...

Static Public Attributes inherited from ns3::test::RandomVariable::TestCaseBase
static const uint32_t	N_BINS {50}
	Number of bins for sampling the distributions. More...

static const uint32_t	N_MEASUREMENTS {1000000}
	Number of samples to draw when populating the distributions. More...

static const uint32_t	N_RUNS {5}
	Number of retry attempts to pass a chi-square test. More...

Protected Member Functions inherited from ns3::TestCase
	TestCase (std::string name)
	Constructor. More...

void	AddTestCase (TestCase *testCase, TestDuration duration=QUICK)
	Add an individual child TestCase to this test suite. More...

TestCase *	GetParent () const
	Get the parent of this TestCsse. More...

bool	IsStatusFailure (void) const
	Check if any tests failed. More...

bool	IsStatusSuccess (void) const
	Check if all tests passed. More...

void	SetDataDir (std::string directory)
	Set the data directory where reference trace files can be found. More...

void	ReportTestFailure (std::string cond, std::string actual, std::string limit, std::string message, std::string file, int32_t line)
	Log the failure of this TestCase. More...

bool	MustAssertOnFailure (void) const
	Check if this run should assert on failure. More...

bool	MustContinueOnFailure (void) const
	Check if this run should continue on failure. More...

std::string	CreateDataDirFilename (std::string filename)
	Construct the full path to a file in the data directory. More...

std::string	CreateTempDirFilename (std::string filename)
	Construct the full path to a file in a temporary directory. More...

Detailed Description

Test case for Erlang distribution random variable stream generator.

Definition at line 1743 of file random-variable-stream-test-suite.cc.

Constructor & Destructor Documentation

◆ ErlangTestCase()

ns3::test::RandomVariable::ErlangTestCase::ErlangTestCase ( )

Definition at line 1763 of file random-variable-stream-test-suite.cc.

Member Function Documentation

◆ ChiSquaredTest()

double ns3::test::RandomVariable::ErlangTestCase::ChiSquaredTest ( Ptr< RandomVariableStream > rng ) const

virtual

Compute the chi square value from a random variable.

This function sets up the binning and expected distribution needed to actually compute the chi squared value, which should be done by a call to ChiSquared.

This is the point of customization expected to be implemented in derived classes with the appropriate histogram binning and expected distribution. For example

SomeRngTestCase::ChiSquaredTest (Ptr<RandomVariableStream> rng) const { gsl_histogram * h = gsl_histogram_alloc (N_BINS); auto range = UniformHistogramBins (h, -4., 4.); std::vector<double> expected (N_BINS); // Populated expected for (std::size_t i = 0; i < N_BINS; ++i) { expected[i] = ...; expected[i] *= N_MEASUREMENTS; } double chiSquared = ChiSquared (h, expected, rng); gsl_histogram_free (h); return chiSquared; }

Parameters

[in] rng The random number generator to test.