From 9e7166a52e94d8e15bf2dbfe00026f21f76630a9 Mon Sep 17 00:00:00 2001 From: Elizabeth Hunt Date: Wed, 18 Oct 2023 12:49:39 -0600 Subject: oct 16, 18 notes. add unit tests with utest, and bisection root finding methods --- test/approx_derivative.t.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 test/approx_derivative.t.c (limited to 'test/approx_derivative.t.c') diff --git a/test/approx_derivative.t.c b/test/approx_derivative.t.c new file mode 100644 index 0000000..6bcac79 --- /dev/null +++ b/test/approx_derivative.t.c @@ -0,0 +1,32 @@ +#include "lizfcm.test.h" + +double f(double x) { return x * x; } + +double f_prime(double x) { return 2 * x; } + +double H = 0.0001; +double ACCEPTED_DERIVATIVE_ERROR = 0.0001; + +UTEST(derivative, central) { + double a = 3.0; + double expected = f_prime(a); + double f_prime_x = central_derivative_at(&f, a, H); + + EXPECT_NEAR(expected, f_prime_x, ACCEPTED_DERIVATIVE_ERROR); +} + +UTEST(derivative, forward) { + double a = 3.0; + double expected = f_prime(a); + double f_prime_x = forward_derivative_at(&f, a, H); + + EXPECT_NEAR(expected, f_prime_x, ACCEPTED_DERIVATIVE_ERROR); +} + +UTEST(derivative, backward) { + double a = 3.0; + double expected = f_prime(a); + double f_prime_x = backward_derivative_at(&f, a, H); + + EXPECT_NEAR(expected, f_prime_x, ACCEPTED_DERIVATIVE_ERROR); +} -- cgit v1.3