add Sem unit tests

test/unit_tests/model.jl

@@ -0,0 +1,91 @@
+using StructuralEquationModels, Test, Statistics
+using StructuralEquationModels:
+    SemSpecification,
+    samples,
+    nsamples,
+    observed_vars,
+    nobserved_vars,
+    obs_cov,
+    obs_mean,
+    vars,
+    nvars,
+    observed_vars,
+    latent_vars,
+    nobserved_vars,
+    nlatent_vars,
+    params,
+    nparams
+
+dat = example_data("political_democracy")
+dat_missing = example_data("political_democracy_missing")[:, names(dat)]
+
+obs_vars = [Symbol.("x", 1:3); Symbol.("y", 1:8)]
+lat_vars = [:ind60, :dem60, :dem65]
+
+graph = @StenoGraph begin
+    # loadings
+    ind60 → fixed(1) * x1 + x2 + x3
+    dem60 → fixed(1) * y1 + y2 + y3 + y4
+    dem65 → fixed(1) * y5 + y6 + y7 + y8
+    # latent regressions
+    label(:a) * dem60 ← ind60
+    dem65 ← dem60
+    dem65 ← ind60
+    # variances
+    _(obs_vars) ↔ _(obs_vars)
+    _(lat_vars) ↔ _(lat_vars)
+    # covariances
+    y1 ↔ y5
+    y2 ↔ y4 + y6
+    y3 ↔ y7
+    y8 ↔ y4 + y6
+end
+
+ram_matrices =
+    RAMMatrices(ParameterTable(graph, observed_vars = obs_vars, latent_vars = lat_vars))
+
+obs = SemObservedData(specification = ram_matrices, data = dat)
+
+function test_vars_api(semobj, spec::SemSpecification)
+    @test @inferred(nobserved_vars(semobj)) == nobserved_vars(spec)
+    @test observed_vars(semobj) == observed_vars(spec)
+
+    @test @inferred(nlatent_vars(semobj)) == nlatent_vars(spec)
+    @test latent_vars(semobj) == latent_vars(spec)
+
+    @test @inferred(nvars(semobj)) == nvars(spec)
+    @test vars(semobj) == vars(spec)
+end
+
+function test_params_api(semobj, spec::SemSpecification)
+    @test @inferred(nparams(semobj)) == nparams(spec)
+    @test @inferred(params(semobj)) == params(spec)
+end
+
+@testset "Sem(imply=$implytype, loss=$losstype)" for implytype in (RAM, RAMSymbolic),
+    losstype in (SemML, SemWLS)
+
+    model = Sem(
+        specification = ram_matrices,
+        observed = obs,
+        imply = implytype,
+        loss = losstype,
+    )
+
+    @test model isa Sem
+    @test @inferred(imply(model)) isa implytype
+    @test @inferred(observed(model)) isa SemObserved
+    @test @inferred(optimizer(model)) isa SemOptimizer
+
+    test_vars_api(model, ram_matrices)
+    test_params_api(model, ram_matrices)
+
+    test_vars_api(imply(model), ram_matrices)
+    test_params_api(imply(model), ram_matrices)
+
+    @test @inferred(loss(model)) isa SemLoss
+    semloss = loss(model).functions[1]
+    @test semloss isa losstype
+
+    @test @inferred(nsamples(model)) == nsamples(obs)
+end

test/unit_tests/unit_tests.jl

@@ -15,3 +15,7 @@ end
 @safetestset "SemSpecification" begin
     include("specification.jl")
 end
+
+@safetestset "Sem model" begin
+    include("model.jl")
+end