diff --git a/test/runtests.jl b/test/runtests.jl
index 838932f..343ee6c 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -86,4 +86,12 @@ using Zygote
         test_rrule(iradon, y, [0, π/4, π/2, 2π, 0.1, 0.00001] ⊢ ChainRulesTestUtils.NoTangent(), 0.01 ⊢ ChainRulesTestUtils.NoTangent())
     end
 
+
+    @testset "utils" begin
+        @test RadonKA.find_intersections(0.0, 0.0, 4.0, 2.0) ≈ [0.0 1.0 2.0 2.0 3.0 4.0; 0.0 0.5 1.0 1.0 1.5 2.0]
+        @test RadonKA.find_intersections(0, 0, 2, 2) ≈ [0 1 1 2; 0 1 1 2]
+        @test RadonKA.find_intersections(0.0, 0.75, 2.75, 4.0) ≈ [0.0 0.21153846153846156 1.0 1.0576923076923077 1.9038461538461537 2.0 2.75; 0.75 1.0 1.9318181818181819 2.0 3.0 3.1136363636363638 4.0]
+        @test all(RadonKA.rays_on_circle(randn((8, 8)), 0.0) .≈ ([5.5, 3.26393202250021, 2.6715728752538097, 2.5, 2.6715728752538097, 3.26393202250021, 5.5], [2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5], [5.5, 7.73606797749979, 8.32842712474619, 8.5, 8.32842712474619, 7.73606797749979, 5.5], [2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5]))
+    end
+
 end