fix: fix tests

Author: askorupka

GNNGraphs/test/sampling.jl

@@ -48,17 +48,17 @@ if GRAPH_T == :coo
 
     @testset "induced_subgraph" begin
         # Create a simple GNNGraph with two nodes and one edge
-        graph = GNNGraph()  # Initialize graph
-        add_nodes!(graph, 2)  # Add 2 nodes
-        add_edge!(graph, 1, 2)  # Add an edge from node 1 to node 2
-        graph.x = rand(10, 2)  # Assign random features to both nodes (10 features per node)
-    
+        s = [1]
+        t = [2]
+        ### TODO add data
+        graph = GNNGraph((s, t))
+        
         # Induce subgraph on both nodes
         nodes = [1, 2]
         subgraph = induced_subgraph(graph, nodes)
 
         @test num_nodes(subgraph) == 2  # Subgraph should have 2 nodes
-        @test num_nodes(subgraph) == 1  # Subgraph should have 1 edge
+        @test num_edges(subgraph) == 1  # Subgraph should have 1 edge
         ### TODO @test subgraph.ndata.x == graph.x[:, nodes]  # Features should match the original graph
     end
 end