From d29109e5161e97cd7622d3e839aa095b4bf124ad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mario=20H=C3=BCttel?= <mario.huettel@gmx.net>
Date: Sun, 19 Apr 2020 00:40:17 +0200
Subject: [PATCH] Add unittests for calculation functions for vectors

---
 test/geometric/vector-operations.cpp | 117 +++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)

diff --git a/test/geometric/vector-operations.cpp b/test/geometric/vector-operations.cpp
index 259df90..58178ea 100644
--- a/test/geometric/vector-operations.cpp
+++ b/test/geometric/vector-operations.cpp
@@ -41,3 +41,120 @@ TEST_CASE("geometric/vector-operations/vector_2d_calculate_angle_between", "[GEO
 	angle = vector_2d_calculate_angle_between(&a, &b);
 	REQUIRE(angle == Approx(90.0 / 180.0 * M_PI));
 }
+
+TEST_CASE("geometric/vector-operations/vector_2d_subtract", "[GEOMETRIC]")
+{
+	struct vector_2d res;
+	struct vector_2d a;
+	struct vector_2d b;
+
+	a.x = 1;
+	a.y = 2;
+
+	b.x = 2;
+	b.y = 6;
+
+	vector_2d_subtract(&res, &a, &b);
+
+	REQUIRE(res.x == Approx(a.x - b.x));
+	REQUIRE(res.y == Approx(a.y - b.y));
+}
+
+TEST_CASE("geometric/vector-operations/vector_2d_abs", "[GEOMETRIC]")
+{
+	struct vector_2d c;
+	struct vector_2d a;
+	struct vector_2d b;
+	double a_len, b_len, c_len;
+
+	a.x = 1;
+	a.y = 0;
+
+	b.x = 0;
+	b.y = 2;
+
+	c.x = 3;
+	c.y = 4;
+
+	a_len = vector_2d_abs(&a);
+	b_len = vector_2d_abs(&b);
+	c_len = vector_2d_abs(&c);
+
+	REQUIRE(a_len == Approx(1.0));
+	REQUIRE(b_len == Approx(2.0));
+	REQUIRE(c_len == Approx(5.0));
+}
+
+TEST_CASE("geometric/vector-operations/vector_2d_scalar_multipy", "[GEOMETRIC]")
+{
+	struct vector_2d c;
+	struct vector_2d a;
+	struct vector_2d b;
+	double mult;
+
+	a.x = 1;
+	a.y = 0;
+	b.x = 0;
+	b.y = 2;
+	mult = vector_2d_scalar_multipy(&a, &b);
+	REQUIRE(mult == Approx(0.0));
+	
+	a.x = 1;
+	a.y = 1;
+	b.x = 1;
+	b.y = 1;
+	mult = vector_2d_scalar_multipy(&a, &b);
+	REQUIRE(mult == Approx(2.0));	
+}
+
+TEST_CASE("geometric/vector-operations/vector_2d_normalize", "[GEOMETRIC]")
+{
+	struct vector_2d a;
+
+	a.x = 1;
+	a.y = 0;
+	vector_2d_normalize(&a);
+	REQUIRE(a.x == Approx(1.0));
+	REQUIRE(a.y == Approx(0.0));
+
+	a.x = 1;
+	a.y = -1;
+	vector_2d_normalize(&a);
+	REQUIRE(a.x == Approx(1.0/sqrt(2)));
+	REQUIRE(a.y == Approx(-1.0/sqrt(2)));
+}
+
+TEST_CASE("geometric/vector-operations/vector_2d_rotate", "[GEOMETRIC]")
+{
+	struct vector_2d a;
+
+	a.x = 1;
+	a.y = 0;
+	vector_2d_rotate(&a, M_PI/2);
+	REQUIRE(a.x == Approx(0.0).scale(0.001));
+	REQUIRE(a.y == Approx(1.0));
+
+	a.x = 0;
+	a.y = 1;
+	vector_2d_rotate(&a, -M_PI/2);
+	vector_2d_rotate(&a, M_PI);
+	REQUIRE(a.x == Approx(-1.0));
+	REQUIRE(a.y == Approx(0.0).scale(0.001));
+}
+
+TEST_CASE("geometric/vector-operations/vector_2d_scale", "[GEOMETRIC]")
+{
+	struct vector_2d a;
+
+	a.x = 1;
+	a.y = 0;
+	vector_2d_scale(&a, 2.0);
+	REQUIRE(a.x == Approx(2.0));
+	REQUIRE(a.y == Approx(0.0));
+
+	a.x = 1;
+	a.y = -3;
+	vector_2d_scale(&a, 0.5);
+	REQUIRE(a.x == Approx(0.5));
+	REQUIRE(a.y == Approx(-1.5));
+}