test: ensure all node interface branches tested

Author: MilesCranmer

test/test_node_interface.jl

@@ -6,13 +6,21 @@
     x1 = Node{Float64}(; feature=1)
     x2 = Node{Float64}(; feature=2)
 
-    operators = OperatorEnum(; binary_operators=[+, *])
+    operators = OperatorEnum(; binary_operators=[+, *], unary_operators=[sin])
 
-    tree_branch = x1 + x2 * 3.5
+    tree_branch_deg2 = x1 + sin(x2 * 3.5)
+    tree_branch_deg1 = sin(x1)
     tree_leaf = x1
-    graph_tree_branch = convert(GraphNode, tree_branch)
+    graph_tree_branch_deg2 = convert(GraphNode, tree_branch_deg2)
+    graph_tree_branch_deg1 = convert(GraphNode, tree_branch_deg1)
     graph_tree_leaf = convert(GraphNode, tree_leaf)
 
-    @test Interfaces.test(NodeInterface, Node, [tree_branch, tree_leaf])
-    @test Interfaces.test(NodeInterface, GraphNode, [graph_tree_branch, graph_tree_leaf])
+    @test Interfaces.test(
+        NodeInterface, Node, [tree_branch_deg2, tree_branch_deg1, tree_leaf]
+    )
+    @test Interfaces.test(
+        NodeInterface,
+        GraphNode,
+        [graph_tree_branch_deg2, graph_tree_branch_deg1, graph_tree_leaf],
+    )
 end