Create simple test for util function

src/utils.jl

@@ -18,7 +18,11 @@ function relu_cap(x; ω₀)
     return min_value + (max_value - min_value) * max(0.0, min(x, 1.0))
 end
 
-function cart2sph(X; radians=true)
+"""
+Convert cartesian coordinates to spherical
+"""
+function cart2sph(X::AbstractArray{<:Number}; radians=true)
+    @assert size(X)[1] == 3 "Input array must have three rows."
     Y = mapslices(x -> [angle(x[1] + x[2]*im), asin(x[3])] , X, dims=1)
     if !radians
         Y *= 180. / π

test/runtests.jl

@@ -1,6 +1,12 @@
 using SphereFit
 using Test
 
+function test_cart2sph()
+    X₀ = [1 0 0 √2; 0 1 0 √2; 0 0 1 0]
+    Y₀ = [0.0 90.0 0.0 45.0; 0.0 0.0 90.0 0.0]
+    @test all(isapprox.(Y₀, cart2sph(X₀, radians=false), atol=1e-6))
+end
+
 @testset "SphereFit.jl" begin
-    # Write your tests here.
+    test_cart2sph()
 end