import mir.test: shouldApprox;

0.0.weibullPDF(3.0).shouldApprox == 0;
0.5.weibullPDF(3.0).shouldApprox == 0.6618727;
1.0.weibullPDF(3.0).shouldApprox == 1.103638;
1.5.weibullPDF(3.0).shouldApprox == 0.2309723;

// Can also provide scale parameter
0.5.weibullPDF(2.0, 3.0).shouldApprox == 0.1080672;
1.0.weibullPDF(2.0, 3.0).shouldApprox == 0.1988532;
1.5.weibullPDF(2.0, 3.0).shouldApprox == 0.2596003;