Add unit test for math.c

src/usr/include/math.h

@@ -11,6 +11,7 @@ int isnan(double x);
 double floor(double x);
 double round(double x);
 double fmod(double x, double y);
+double fabs(double x);
 
 double sin(double x);
 double cos(double x);

src/usr/lib/math.c

@@ -24,6 +24,8 @@ double round(double x) { return floor(x + 0.5); }
 
 double fmod(double x, double y) { return x - floor(x / y) * y; }
 
+double fabs(double x) { return (x >= 0) ? x : -x; }
+
 double sin(double x) {
     const int terms = 32;
     const double x2 = x * x;

src/usr/local/src/test-math.cpp

@@ -0,0 +1,68 @@
+#include <math.h>
+#include <stdio.h>
+#include <testing.h>
+
+double EPSILON = 1e-9;
+
+double check_double_equal(double x, double y) {
+    return std::fabs(x - y) < EPSILON;
+}
+
+double to_radian(double x) { return x * (M_PI / 180); }
+
+void test_isnan() {
+    ASSERT_TRUE(std::isnan(16.0) == 0);
+    ASSERT_TRUE(std::isnan(-16.0) == 0);
+    ASSERT_TRUE(std::isnan(0.0 / 0.0) != 0);
+    ASSERT_TRUE(std::isnan(1.0 / 0.0) == 0);
+}
+
+void test_floor() {
+    ASSERT_TRUE(check_double_equal(std::floor(16.0), 16.0));
+    ASSERT_TRUE(check_double_equal(std::floor(16.6), 16.0));
+    ASSERT_TRUE(check_double_equal(std::floor(-16.0), -16.0));
+    ASSERT_TRUE(check_double_equal(std::floor(-16.9), -17));
+}
+
+void test_round() {
+    ASSERT_TRUE(check_double_equal(std::round(16.3), 16.0));
+    ASSERT_TRUE(check_double_equal(std::round(16.6), 17.0));
+    ASSERT_TRUE(check_double_equal(std::round(-16.0), -16.0));
+    ASSERT_TRUE(check_double_equal(std::round(-16.9), -17));
+}
+
+void test_fmod() {
+    ASSERT_TRUE(check_double_equal(std::fmod(1.6, 1.2), 0.4));
+    ASSERT_TRUE(check_double_equal(std::fmod(7.0, 5.0), 2.0));
+}
+
+void test_fabs() {
+    ASSERT_TRUE(check_double_equal(std::fabs(1.6), 1.6));
+    ASSERT_TRUE(check_double_equal(std::fabs(-7.7), 7.7));
+    ASSERT_TRUE(check_double_equal(std::fabs(0.0), 0.0));
+}
+
+void test_sin() {
+    ASSERT_TRUE(check_double_equal(std::sin(to_radian(45.0)), 0.7071067812));
+    ASSERT_TRUE(check_double_equal(std::sin(to_radian(90.0)), 1.0));
+}
+
+void test_cos() {
+    ASSERT_TRUE(check_double_equal(std::cos(to_radian(60.0)), 0.5));
+    ASSERT_TRUE(check_double_equal(std::cos(to_radian(90.0)), 0.0));
+}
+
+int main(int argc, char *argv[]) {
+    TEST_INIT();
+
+    RUN_TEST(test_isnan);
+    RUN_TEST(test_floor);
+    RUN_TEST(test_round);
+    RUN_TEST(test_fmod);
+    RUN_TEST(test_fabs);
+    RUN_TEST(test_sin);
+    RUN_TEST(test_cos);
+
+    TEST_SUMMARY();
+    return 0;
+}

tests/app/libraries/usr_lib_test.sh

@@ -14,3 +14,4 @@ function add_library_unit_test {
 add_library_unit_test "test-string"
 add_library_unit_test "test-stdlib"
 add_library_unit_test "test-vector"
+add_library_unit_test "test-math"