test(element): add runtests.jl

Test suite organizer for element module.
Includes CElement creation, type, and interpolation tests.

test/element/runtests.jl

@@ -0,0 +1,24 @@
+# This file is a part of JuliaFEM.
+# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE
+
+"""
+Test Suite for Ciarlet Elements
+"""
+
+using Test
+using JuliaFEM
+using Tensors
+
+@testset "Ciarlet Elements" begin
+    @testset "CElement Type" begin
+        include("test_celement_type.jl")
+    end
+    
+    @testset "CElement Creation" begin
+        include("test_celement_creation.jl")
+    end
+    
+    @testset "CElement Interpolation" begin
+        include("test_celement_interpolation.jl")
+    end
+end