diff --git a/libs/geom/tests/point.cpp b/libs/geom/tests/point.cpp
index 48fb3770..9b0952c7 100644
--- a/libs/geom/tests/point.cpp
+++ b/libs/geom/tests/point.cpp
@@ -105,3 +105,13 @@ test_case(geom_point_distance)
 	expect_equal(distance_sqr(p1, p2), 169.f);
 	expect_close(distance(p1, p2), 13.f, 1e-6);
 }
+
+test_case(geom_point_lerp)
+{
+	point p1{1.f, 2.f, 3.f};
+	point p2{5.f, 6.f, 7.f};
+
+	expect_equal((lerp(p1, p2, 0.25f)), (point{2.f, 3.f, 4.f}));
+	expect_equal((lerp(p1, p2, 0.5f )), (point{3.f, 4.f, 5.f}));
+	expect_equal((lerp(p1, p2, 0.75f)), (point{4.f, 5.f, 6.f}));
+}
diff --git a/libs/geom/tests/vector.cpp b/libs/geom/tests/vector.cpp
index 97340e3d..4f194274 100644
--- a/libs/geom/tests/vector.cpp
+++ b/libs/geom/tests/vector.cpp
@@ -1,6 +1,7 @@
 #include <psemek/test/test.hpp>
 
 #include <psemek/geom/vector.hpp>
+#include <psemek/geom/math.hpp>
 
 using namespace psemek::geom;
 
@@ -147,3 +148,28 @@ test_case(geom_vector_length)
 	expect_equal(length_sqr(v), 169.f);
 	expect_close(length(v), 13.f, 1e-6);
 }
+
+test_case(geom_vector_lerp)
+{
+	vector v1{1.f, 2.f, 3.f};
+	vector v2{5.f, 6.f, 7.f};
+
+	expect_equal((lerp(v1, v2, 0.25f)), (vector{2.f, 3.f, 4.f}));
+	expect_equal((lerp(v1, v2, 0.5f )), (vector{3.f, 4.f, 5.f}));
+	expect_equal((lerp(v1, v2, 0.75f)), (vector{4.f, 5.f, 6.f}));
+}
+
+test_case(geom_vector_slerp)
+{
+	vector v1{1.f, 0.f};
+	vector v2{0.f, 1.f};
+
+	for (int i = 0; i <= 9; ++i)
+	{
+		// 10-degree steps
+		auto s = slerp(v1, v2, i / 9.f);
+		expect_close((length(s)), 1.f, 1e-6);
+		expect_gequal((det(v1, s)), 0.f);
+		expect_gequal((det(s, v2)), 0.f);
+	}
+}