Add tests for model conditioning syntax

Author: penelopeysm

test/model.jl

@@ -100,6 +100,28 @@ const GDEMO_DEFAULT = DynamicPPL.TestUtils.demo_assume_observe_literal()
         end
     end
 
+    @testset "model conditioning with various arguments" begin
+        @model function demo_condition()
+            x ~ Normal()
+            y ~ Normal(x)
+        end
+        model = demo_condition()
+        # Test that different syntaxes work and give the same underlying ConditionContext
+        @testset "NamedTuple ConditionContext" begin
+            expected_values = (y = 2,)
+            @test condition(model, (y=2,)).context.values == expected_values
+            @test condition(model, y=2).context.values == expected_values
+            @test condition(model; y=2).context.values == expected_values
+            @test (model | (y = 2, )).context.values == expected_values
+        end
+        @testset "AbstractDict ConditionContext" begin
+            expected_values = Dict(@varname(y) => 2)
+            @test condition(model, Dict(@varname(y) => 2)).context.values == expected_values
+            @test condition(model, @varname(y) => 2).context.values == expected_values
+            @test (model | (@varname(y) => 2, )).context.values == expected_values
+        end
+    end
+
     @testset "DynamicPPL#684: threadsafe evaluation with multiple types" begin
         @model function multiple_types(x)
             ns ~ filldist(Normal(0, 2.0), 3)