Add more tests

[jellepoland]

The following files should be populated:

• tests/polars/test_polars.jl
• tests/VortexStepMethod/test_VortexStepMethod.jl

Verification test cases could be taken from the Python Package

See: https://github.com/ocayon/Vortex-Step-Method/tree/main/tests/verification_cases

[1-Bart-1]

tests/VortexStepMethod/test_VortexStepMethod.jl

What would you suggest to add here?

[jellepoland]

I asked the AI, something along the lines of:

1. Module Loading and Exports Tests

@testset "Module Loading and Exports" begin
    @test isdefined(VortexStepMethod, :VSMSettings)
    @test isdefined(VortexStepMethod, :Wing)
    @test isdefined(VortexStepMethod, :Solver)
    @test isdefined(VortexStepMethod, :load_polar_data)
    
    # Test all enums are properly defined
    @test VSM isa Model
    @test LLT isa Model
    @test POLAR_VECTORS isa AeroModel
    @test INVISCID isa AeroModel
    @test LINEAR isa PanelDistribution
    @test COSINE isa PanelDistribution
end

2. Type and Constant Tests

@testset "Type Definitions" begin
    # Test MVec3 type
    v = MVec3([1.0, 2.0, 3.0])
    @test v isa MVec3
    @test length(v) == 3
    @test v[1] == 1.0
    
    # Test PosVector union type
    @test MVec3([0,0,0]) isa PosVector
    @test [0.0, 0.0, 0.0] isa PosVector
    
    # Test AeroData union type
    @test nothing isa AeroData
    @test (1.0, 2.0) isa AeroData
    @test ([1.0], [2.0], [3.0], [4.0]) isa AeroData
end

3. Enum Value Tests

@testset "Enum Values" begin
    # Test Model enum
    @test instances(Model) == (VSM, LLT)
    
    # Test AeroModel enum
    @test LEI_AIRFOIL_BREUKELS ∈ instances(AeroModel)
    @test POLAR_VECTORS ∈ instances(AeroModel)
    @test POLAR_MATRICES ∈ instances(AeroModel)
    @test INVISCID ∈ instances(AeroModel)
    
    # Test PanelDistribution enum
    @test LINEAR ∈ instances(PanelDistribution)
    @test COSINE ∈ instances(PanelDistribution)
    @test COSINE_VAN_GARREL ∈ instances(PanelDistribution)
    
    # Test SolverStatus enum
    @test FEASIBLE ∈ instances(SolverStatus)
    @test INFEASIBLE ∈ instances(SolverStatus)
    @test FAILURE ∈ instances(SolverStatus)
    
    # Test SolverType enum
    @test LOOP ∈ instances(SolverType)
    @test NONLIN ∈ instances(SolverType)
end

4. Utility Function Tests

@testset "Utility Functions" begin
    # Test menu function doesn't crash
    @test_nowarn VortexStepMethod.menu()
    
    # Test copy_examples creates directory and files
    temp_dir = mktempdir()
    cd(temp_dir) do
        @test_nowarn VortexStepMethod.copy_examples()
        @test isdir("examples")
        @test !isempty(readdir("examples"))
    end
    
    # Test install_examples with add_packages=false
    temp_dir = mktempdir()
    cd(temp_dir) do
        @test_nowarn VortexStepMethod.install_examples(false)
        @test isdir("examples")
    end
end

5. Cross-Platform Compatibility Tests

@testset "Cross-Platform Compatibility" begin
    # Test help function on different platforms
    if Sys.islinux()
        @test_nowarn VortexStepMethod.help("https://example.com")
    elseif Sys.iswindows() || Sys.isapple()
        @test_nowarn VortexStepMethod.help("https://example.com")
    end
end

6. Integration Tests with Included Files

@testset "Module Integration" begin
    # Test that all included files are properly loaded
    @test isdefined(VortexStepMethod, :VSMSettings)  # from settings.jl
    @test isdefined(VortexStepMethod, :Wing)         # from wing_geometry.jl
    @test isdefined(VortexStepMethod, :Solver)       # from solver.jl
    @test isdefined(VortexStepMethod, :load_polar_data) # from yaml_geometry.jl
    
    # Test basic functionality works
    @test_nowarn VSMSettings()
    
    # Test that plotting functions are defined (even if they do nothing)
    @test isdefined(VortexStepMethod, :plot_geometry)
    @test isdefined(VortexStepMethod, :plot_distribution)
end

7. Error Handling Tests

@testset "Error Handling" begin
    # Test copy_files with invalid paths
    @test_throws SystemError VortexStepMethod.copy_files("/invalid/path", ["file.txt"])
    
    # Test help function with invalid URLs (should not crash)
    @test_nowarn VortexStepMethod.help("invalid://url")
end

8. Package Dependencies Tests

@testset "Package Dependencies" begin
    # Test that all required packages are loaded
    @test isdefined(VortexStepMethod, :LinearAlgebra)
    @test isdefined(VortexStepMethod, :StaticArrays)
    @test isdefined(VortexStepMethod, :YAML)
    @test isdefined(VortexStepMethod, :Parameters)
    @test isdefined(VortexStepMethod, :Interpolations)
    
    # Test specific imports work
    @test isdefined(VortexStepMethod, :solve!)  # from NonlinearSolve
    @test isdefined(VortexStepMethod, :Extrapolation)  # from Interpolations
end

9. Performance Tests

@testset "Performance Tests" begin
    using BenchmarkTools
    
    # Test MVec3 creation performance
    @test (@benchmark MVec3([1.0, 2.0, 3.0])).time < 1000  # nanoseconds
    
    # Test enum comparison performance
    @test (@benchmark VSM == VSM).time < 100
end

10. Documentation Tests

@testset "Documentation" begin
    # Test that docstrings exist for key types
    @test !isempty(string(@doc VortexStepMethod.MVec3))
    @test !isempty(string(@doc VortexStepMethod.Model))
    @test !isempty(string(@doc VortexStepMethod.AeroModel))
    @test !isempty(string(@doc VortexStepMethod.AeroData))
    
    # Test that examples in docstrings are syntactically valid
    @test_nowarn eval(Meta.parse("MVec3([1.0, 2.0, 3.0])"))
end

11. Version and Compatibility Tests

@testset "Version Compatibility" begin
    # Test Julia version compatibility
    @test VERSION >= v"1.9"  # or whatever minimum version you support
    
    # Test that the module can be precompiled
    @test_nowarn eval(:(precompile(VortexStepMethod.menu, ())))
end

These tests would ensure that:

• The module loads correctly
• All exports are properly defined
• Type system works as expected
• Utility functions behave correctly
• Cross-platform compatibility is maintained
• Integration between different components works
• Performance is reasonable
• Documentation is present and correct

You could organize these into a dedicated test file like test/module/test_vortexstepmethod.jl to keep them separate from the functional tests of individual components.