Update

test/test_constraint.jl

@@ -2199,9 +2199,7 @@ function test_shadow_price_errors()
     @variable(model, x >= 0)
     set_optimizer(
         model,
-        () -> MOI.Utilities.MockOptimizer(
-            MOI.Utilities.Model{Float64}(),
-        ),
+        () -> MOI.Utilities.MockOptimizer(MOI.Utilities.Model{Float64}()),
     )
     optimize!(model)
     mock = unsafe_backend(model)

test/test_model.jl

@@ -1371,7 +1371,7 @@ function test_copy_nonlinear()
     @test_throws(
         ErrorException(
             "copy is not supported yet for models with nonlinear constraints" *
-            " and/or nonlinear objective function"
+            " and/or nonlinear objective function",
         ),
         copy_model(model),
     )

test/test_nlp.jl

@@ -1683,4 +1683,46 @@ function test_get_node_type_comparison()
     return
 end
 
+function test_NL_dot()
+    model = Model()
+    @variable(model, x)
+    y = (; abc = x)
+    @NLexpression(model, ref, y.abc)
+    nlp = nonlinear_model(model)
+    @test MOI.Nonlinear.parse_expression(nlp, x) == nlp[index(ref)]
+    return
+end
+
+function test_NL_adjoint()
+    model = Model()
+    @variable(model, x)
+    @NLexpression(model, ref, x')
+    nlp = nonlinear_model(model)
+    @test MOI.Nonlinear.parse_expression(nlp, x) == nlp[index(ref)]
+    return
+end
+
+function test_NL_too_many_arguments_errors()
+    model = Model()
+    @test_throws_parsetime(
+        ErrorException(
+            "At `@NLexpression()`: To few arguments (0); must pass the model and nonlinear expression as arguments.",
+        ),
+        @NLexpression(),
+    )
+    @test_throws_parsetime(
+        ErrorException(
+            "At `@NLexpression(model, ex, 1, 2)`: To many arguments (4).",
+        ),
+        @NLexpression(model, ex, 1, 2),
+    )
+    @test_throws_parsetime(
+        ErrorException(
+            "At `@NLconstraint(model, ex, 1, 2)`: too many arguments.",
+        ),
+        @NLconstraint(model, ex, 1, 2),
+    )
+    return
+end
+
 end