From acb1ced630ede2a0b97adfac92e5b52df63e90b6 Mon Sep 17 00:00:00 2001
From: Jukka Aho <ahojukka5@gmail.com>
Date: Sat, 9 May 2026 18:38:50 +0300
Subject: [PATCH] test(fields): add DOFSet field spec tests

---
 test/fields/test_field_specs.jl | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 test/fields/test_field_specs.jl

diff --git a/test/fields/test_field_specs.jl b/test/fields/test_field_specs.jl
new file mode 100644
index 0000000..2199275
--- /dev/null
+++ b/test/fields/test_field_specs.jl
@@ -0,0 +1,28 @@
+# SPDX-FileCopyrightText: 2015-2026 Jukka Aho
+# SPDX-License-Identifier: MIT
+
+using Test
+using JuliaFEM
+using Tensors
+
+@testset "DOFSet / field spec helpers" begin
+    S = @DOFSet{T::DOF{Temperature, Vertex}, u::DOF{Displacement{3}, Vertex}}
+    @test field_names(S) === (:T, :u)
+    @test field_count(S) == 2
+    @test !is_single_field(S)
+
+    S1 = @DOFSet{u::DOF{Displacement{3}, Vertex}}
+    @test is_single_field(S1)
+
+    @test field_ndofs(DOF{Float64, Vertex}, Tetrahedron{4}) == 4
+    @test ndofs(DOF{Float64, Vertex}, Tetrahedron{4}) == 4
+    @test ndofs(S, Tetrahedron{4}) == 4 + 12
+
+    @test quantity_type(DOF{Float64, Vertex}) === Float64
+    @test entity_type(DOF{Displacement{3}, Vertex}) === Vertex
+
+    Bad = @NamedTuple{x::Int}
+    @test_throws ErrorException ndofs(Bad, Tetrahedron{4})
+
+    @test_throws ErrorException quantity_type(DOF{String, Vertex})
+end