diff --git a/test/unit/CMakeLists.txt b/test/unit/CMakeLists.txt
index 94d2701..5d0ed76 100644
--- a/test/unit/CMakeLists.txt
+++ b/test/unit/CMakeLists.txt
@@ -9,6 +9,7 @@ add_executable(${PROJECT_NAME}
 	test_operators.cpp
 	test_sequence_range.cpp
 	test_offset_getters.cpp
+	test_custom_type.cpp
 )
 
 target_link_libraries(${PROJECT_NAME}
diff --git a/test/unit/test_custom_type.cpp b/test/unit/test_custom_type.cpp
new file mode 100644
index 0000000..fb85c43
--- /dev/null
+++ b/test/unit/test_custom_type.cpp
@@ -0,0 +1,147 @@
+/*
+ * Copyright 2015-2017 Michele "King_DuckZ" Santullo
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "vectorwrapper/vectorwrapper.hpp"
+#include "vectorwrapper/vector_cast.hpp"
+#include <gtest/gtest.h>
+#include <cstddef>
+#include <array>
+#include <iostream>
+
+namespace {
+	int gcd (int a, int b) {
+		if ((a && b) == false)
+			return 0;
+
+		int r, q, uRet;
+
+		do {
+			uRet = b;
+
+			q = a / b;
+			r = a - q * b;
+
+			a = b;
+			b = r;
+		} while (r);
+		return uRet;
+	}
+
+	class Rational {
+	public:
+		Rational() = default;
+		Rational (int num, int den) : m_n(num), m_d(den) {}
+		Rational (int num) : m_n(num), m_d(1) {}
+		Rational (const Rational&) = default;
+		Rational (Rational&&) = default;
+		~Rational() = default;
+
+		Rational& operator= (const Rational&) = default;
+		Rational& operator= (Rational&&) = default;
+		bool operator== (const Rational& o) const { return m_n == o.m_n and m_d == o.m_d; }
+		bool operator== (int o) const { return m_n == o and 1 == m_d; }
+
+		operator float() const { return static_cast<float>(m_n) / static_cast<float>(m_d); }
+
+		Rational& operator*= (const Rational& o) {
+			m_n *= o.m_n; m_d *= o.m_d; simplify(); return *this;
+		}
+		Rational& operator/= (const Rational& o) {
+			m_n *= o.m_d; m_d *= o.m_n; simplify(); return *this;
+		}
+
+		int num() const { return m_n; }
+		int den() const { return m_d; }
+
+	private:
+		void simplify() { const int t = gcd(m_n, m_d); m_n /= t; m_d /= t; }
+
+		int m_n, m_d;
+	};
+
+	bool operator== (int a, const Rational& b) {
+		return a == b.num() and b.den() == 1;
+	}
+
+	Rational operator* (Rational a, const Rational& b) { a *= b; return a; }
+	Rational operator/ (Rational a, const Rational& b) { a /= b; return a; }
+
+	std::ostream& operator<< (std::ostream& os, const Rational& r) {
+		os << r.num() << '/' << r.den();
+		return os;
+	}
+
+	struct ThreeRationals {
+		Rational a, b, c;
+	};
+} //unnamed namespace
+
+namespace vwr {
+	template <>
+	struct VectorWrapperInfo<ThreeRationals> {
+		enum { dimensions = 3 };
+		typedef Rational scalar_type;
+
+		enum {
+			offset_x = offsetof(ThreeRationals, a),
+			offset_y = offsetof(ThreeRationals, b),
+			offset_z = offsetof(ThreeRationals, c)
+		};
+	};
+
+	template <>
+	struct VectorWrapperInfo<std::array<float, 3> > {
+		enum { dimensions = 3 };
+		typedef float scalar_type;
+
+		static scalar_type& get_at (size_type i, std::array<float, 3>& v) {
+			return v[i];
+		}
+	};
+} //namespace vwr
+
+namespace {
+	typedef vwr::Vec<ThreeRationals> rvec3;
+	typedef vwr::Vec<std::array<float, 3> > fvec3;
+} //unnamed namespace
+
+TEST(vwr, custom_type) {
+	using vwr::vector_cast;
+
+	rvec3 rational3(
+		Rational(1),
+		Rational(1, 2),
+		Rational(1, 3)
+	);
+
+	EXPECT_EQ(1, rational3.x());
+	EXPECT_EQ(Rational(1, 2), rational3.y());
+	EXPECT_EQ(Rational(1, 3), rational3.z());
+
+	fvec3 float3 = vector_cast<fvec3>(rational3);
+	EXPECT_EQ(1.0f, float3.x());
+	EXPECT_EQ(0.5f, float3.y());
+
+	rational3 *= 4;
+	EXPECT_EQ(4, rational3.x());
+	EXPECT_EQ(2, rational3.y());
+	EXPECT_EQ(Rational(4, 3), rational3.z());
+
+	rational3 /= 2;
+	EXPECT_EQ(2, rational3.x());
+	EXPECT_EQ(1, rational3.y());
+	EXPECT_EQ(Rational(2, 3), rational3.z());
+}