Refactored file layout because platformio failed to find things

unit-tests/vector-tests.cpp

@@ -0,0 +1,45 @@
+// include the unit test framework first
+#include <catch2/catch_test_macros.hpp>
+#include <catch2/matchers/catch_matchers_floating_point.hpp>
+
+// include the module you're going to test next
+#include "Vector3D.hpp"
+#include "Matrix.hpp"
+
+// any other libraries
+#include <array>
+#include <cmath>
+#include <iostream>
+
+TEST_CASE("Vector Math", "Vector")
+{
+    V3D<float> v1{1, 2, 3};
+    V3D<float> v2{4, 5, 6};
+    V3D<float> v3{};
+
+    SECTION("Initialization")
+    {
+        // list initialization
+        REQUIRE(v1.x == 1);
+        REQUIRE(v1.y == 2);
+        REQUIRE(v1.z == 3);
+
+        // copy initialization
+        V3D<float> v4{v2};
+        REQUIRE(v4.x == 4);
+        REQUIRE(v4.y == 5);
+        REQUIRE(v4.z == 6);
+
+        // empty initialization
+        REQUIRE(v3.x == 0);
+        REQUIRE(v3.y == 0);
+        REQUIRE(v3.z == 0);
+
+        // matrix initialization
+        Matrix<1, 3> mat1{v1.ToArray()};
+        V3D<float> v5{mat1};
+        REQUIRE(v5.x == v1.x);
+        REQUIRE(v5.y == v1.y);
+        REQUIRE(v5.z == v1.z);
+    }
+}