1 package Math::GSL::Deriv::Test;
2 use base 'Test::Class';
3 use Test::More tests => 9;
4 use Math::GSL qw/:all/;
5 use Math::GSL::Test qw/:all/;
6 use Math::GSL::Deriv qw/:all/;
7 use Math::GSL::Errno qw/:all/;
12 BEGIN{ gsl_set_error_handler_off() };
14 sub make_fixture : Test(setup) {
16 $self->{gsl_func} = Math::GSL::Deriv::gsl_function_struct->new;
19 sub teardown : Test(teardown) {
22 sub TEST_FUNCTION_STRUCT : Tests(1) {
25 isa_ok( $self->{gsl_func},'Math::GSL::Deriv::gsl_function_struct');
28 sub TEST_DERIV_CENTRAL_DIES : Tests(1) {
31 gsl_deriv_central( 'IAMNOTACODEREF', $x, $h);
32 },qr/not a reference value/, 'gsl_deriv_central borks when first arg is not a coderef');
35 sub TEST_DERIV_CENTRAL : Tests(2) {
39 my ($status, $val,$err) = gsl_deriv_central ( sub { $_[0] ** 3 }, $x, $h,);
41 my $res = abs($val-3*$x**2);
42 ok( $res <= $err , sprintf ("gsl_deriv_forward: res=%.18f, abserr=%.18f",$res, $err ));
45 sub TEST_DERIV_FORWARD : Tests(2) {
49 my ($status, $val,$err) = gsl_deriv_forward ( sub { 2 * $_[0] ** 2 }, $x, $h,);
51 my $res = abs($val-4*$x);
52 ok( $res <= $err , sprintf ("gsl_deriv_forward: res=%.18f, abserr=%.18f",$res, $err ));
55 sub TEST_DERIV_BACKWARD : Tests(2) {
58 my ($status, $val, $err) = gsl_deriv_backward ( sub { log $_[0] }, $x, $h,);
60 my $res = abs($val-1/$x);
61 ok( $res <= $err , sprintf ("gsl_deriv_backward: res=%.18f, abserr=%.18f",$res, $err ));
64 sub TEST_DERIV_CENTRAL_CALLS_THE_SUB : Tests(1) {
69 gsl_deriv_central ( sub { die "CALL ME BACK!"} , $x, $h)
70 }, qr/CALL ME BACK/, 'gsl_deriv_central can call anon sub' );
72 Test::Class->runtests;