Add value_iterator_from_chain tests from test/turing/model.jl

test/model_utils.jl

@@ -0,0 +1,18 @@
+@testset "model_utils.jl" begin
+
+    @testset "value_iterator_from_chain" begin
+        @testset "$model" for model in DynamicPPL.TestUtils.DEMO_MODELS
+            chain = make_chain_from_prior(model, 10)
+            for (i, d) in enumerate(value_iterator_from_chain(model, chain))
+                for vn in keys(d)
+                    val = DynamicPPL.getvalue(d, vn)
+                    for vn_leaf in DynamicPPL.varname_leaves(vn, val)
+                        val_leaf = DynamicPPL.getvalue(d, vn_leaf)
+                        @test val_leaf == chain[i, Symbol(vn_leaf), 1]
+                    end
+                end
+            end
+        end
+    end
+
+end