Add missing test file

test/test_ioproblem.jl

@@ -0,0 +1,26 @@
+# Tests for IOExample
+@testset "IOExample Tests" begin
+    input_dict = Dict(:var1 => 42, :var2 => "value")
+    output_value = "test output"
+    io_example = IOExample(input_dict, output_value)
+
+    @test io_example.in == input_dict
+    @test io_example.out == output_value
+end
+
+# Tests for Problem
+@testset "Problem Tests" begin
+    # Create a vector of IOExample instances as specification
+    spec = [IOExample(Dict(:var1 => 1, :var2 => 2), 3), IOExample(Dict(:var1 => 4, :var2 => 5), 6)]
+
+    # Test constructor without a name
+    problem1 = Problem(spec)
+    @test problem1.name == ""
+    @test problem1.spec === spec
+
+    # Test constructor with a name
+    problem_name = "Test Problem"
+    problem2 = Problem(problem_name, spec)
+    @test problem2.name == problem_name
+    @test problem2.spec === spec
+end