Add tests for x_of_nans

Project.toml

@@ -16,6 +16,7 @@ DifferentiationInterface = "0.6.43, 0.7"
 FiniteDiff = "2.0"
 ForwardDiff = "0.10, 1.0"
 LinearAlgebra = "<0.0.1, 1"
+StaticArrays = "1.9"
 julia = "1.10"
 
 [extras]
@@ -25,7 +26,8 @@ OptimTestProblems = "cec144fc-5a64-5bc6-99fb-dde8f63e154c"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 RecursiveArrayTools = "731186ca-8d62-57ce-b412-fbd966d074cd"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
+StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["ADTypes", "ComponentArrays", "OptimTestProblems", "Random", "RecursiveArrayTools", "SparseArrays", "Test"]
+test = ["ADTypes", "ComponentArrays", "OptimTestProblems", "Random", "RecursiveArrayTools", "SparseArrays", "StaticArrays", "Test"]

test/runtests.jl

@@ -2,6 +2,7 @@ using NLSolversBase, Test
 using Random
 using LinearAlgebra: Diagonal, I, mul!
 using ComponentArrays
+using StaticArrays
 using SparseArrays
 using OptimTestProblems
 using RecursiveArrayTools
@@ -87,4 +88,5 @@ end
     include("autodiff.jl")
     include("sparse.jl")
     include("kwargs.jl")
+    include("utils.jl")
 end

test/utils.jl

@@ -0,0 +1,26 @@
+@testset "utililties" begin
+    @testset "x_of_nans" begin
+        for T in (Int, Float32, Float64)
+            for x in (zeros(T), zeros(T, 2), zeros(T, 3, 2))
+                x_nans = @inferred(NLSolversBase.x_of_nans(x))
+                @test x_nans isa Array{float(T),ndims(x)}
+                @test size(x_nans) == size(x)
+                @test all(isnan, x_nans)
+            end
+
+            for x in (SArray{Tuple{}}(zeros(T)), SArray{Tuple{2}}(zeros(T, 2)), SArray{Tuple{3,2}}(zeros(T, 3, 2)))
+                x_nans = @inferred(NLSolversBase.x_of_nans(x))
+                @test x_nans isa MArray{Tuple{size(x)...},float(T)}
+                @test size(x_nans) == size(x)
+                @test all(isnan, x_nans)
+            end
+
+            for x in (MArray{Tuple{}}(zeros(T)), MArray{Tuple{2}}(zeros(T, 2)), MArray{Tuple{3,2}}(zeros(T, 3, 2)))
+                x_nans = @inferred(NLSolversBase.x_of_nans(x))
+                @test x_nans isa MArray{Tuple{size(x)...},float(T)}
+                @test size(x_nans) == size(x)
+                @test all(isnan, x_nans)
+            end
+        end
+    end
+end