test(spline): Implemented data-driven testing for PolyEqvSpline (#62)

Test data for polynomials is used.

Author: pasabanov

tests/CMakeLists.txt

@@ -21,6 +21,8 @@ add_test_executable(test_poly poly/test_poly.cpp)
 
 add_test_executable(test_barycentric misc/test_barycentric.cpp)
 
+add_test_executable(test_polyeqv spline/test_polyeqv.cpp)
+
 add_test_executable(test_step spline/test_step.cpp)
 add_test_executable(test_linear spline/test_linear.cpp)
 add_test_executable(test_quadratic spline/test_quadratic.cpp)

tests/spline/test_polyeqv.cpp

@@ -0,0 +1,55 @@
+#include <ALFI/spline/polyeqv.h>
+
+#include "../test_utils.h"
+
+const auto test_data_path = TEST_DATA_DIR "/poly/poly.toml";
+
+const auto test_data = toml::parse_file(test_data_path);
+
+void test_polyeqv_spline(double epsilon) {
+	const auto& test_cases = test_data["test_cases"].ref<toml::array>();
+
+	test_cases.for_each([&](const toml::table& test_case) {
+		const auto& X = to_vector<double>(test_case["X"].ref<toml::array>());
+		const auto& Y = to_vector<double>(test_case["Y"].ref<toml::array>());
+		const auto& xx = to_vector<double>(test_case["xx"].ref<toml::array>());
+		const auto& yy = to_vector<double>(test_case["yy"].ref<toml::array>());
+
+		expect_eq(alfi::spline::PolyEqvSpline<>(X, Y).eval(xx), yy, epsilon);
+	});
+}
+
+TEST(PolyEqvSplineTest, PolynomialData) {
+	test_polyeqv_spline(1e-10);
+}
+
+TEST(PolyEqvSplineTest, General) {
+	const std::vector<double> X = {0, 1, 2, 3};
+	const std::vector<double> Y = {5, 2, 10, 4};
+	const auto spline = alfi::spline::PolyEqvSpline<>(X, Y);
+	for (size_t i = 0; i < X.size() - 1; ++i) {
+		EXPECT_EQ(spline(X[i]), Y[i]);
+	}
+	EXPECT_NEAR(spline(X[X.size()-1]), Y[Y.size()-1], 1e-14);
+}
+
+TEST(PolyEqvSplineTest, Moving) {
+	std::vector<double> X = {0, 1, 2, 3};
+	const std::vector<double> Y = {5, 2, 10, 4};
+	auto spline = alfi::spline::PolyEqvSpline<>(std::move(X), Y);
+	EXPECT_TRUE(X.empty());
+	EXPECT_FALSE(spline.X().empty());
+	EXPECT_FALSE(spline.coeffs().empty());
+	X = spline.X();
+	auto coeffs = spline.coeffs();
+	EXPECT_FALSE(X.empty());
+	EXPECT_FALSE(coeffs.empty());
+	EXPECT_FALSE(spline.X().empty());
+	EXPECT_FALSE(spline.coeffs().empty());
+	X = std::move(spline).X();
+	coeffs = std::move(spline).coeffs();
+	EXPECT_FALSE(X.empty());
+	EXPECT_FALSE(coeffs.empty());
+	EXPECT_TRUE(spline.X().empty());
+	EXPECT_TRUE(spline.coeffs().empty());
+}