Add validity checks to tests

test/known_graphs.jl

@@ -47,6 +47,8 @@ function test_random_walk(g::DAG, n::Int64)
     # the purpose here is to do "random" operations and reverse them again and validate that the graph stays the same and doesn't diverge
     reset_graph!(g)
 
+    @test is_valid(g)
+
     properties = graph_properties(g)
 
     for i = 1:n
@@ -78,6 +80,8 @@ function test_random_walk(g::DAG, n::Int64)
 
     reset_graph!(g)
 
+    @test is_valid(g)
+
     @test properties == graph_properties(g)
 end
 end

test/node_reduction.jl

@@ -51,6 +51,8 @@ import MetagraphOptimization.make_node
     insert_edge!(graph, BD, B1C_2, false)
     insert_edge!(graph, CD, C1C, false)
 
+    @test is_valid(graph)
+
     @test is_exit_node(d_exit)
     @test is_entry_node(AD)
     @test is_entry_node(BD)
@@ -74,6 +76,8 @@ import MetagraphOptimization.make_node
     @test Set(nr.input) == Set([B1D_1, B1D_2])
     push_operation!(graph, nr)
     opt = get_operations(graph)
+    
+    @test is_valid(graph)
 
     @test length(opt) == (nodeFusions = 4, nodeReductions = 0, nodeSplits = 1)
     #println("After 2 Node Reductions:\n", opt)
@@ -89,5 +93,7 @@ import MetagraphOptimization.make_node
     opt = get_operations(graph)
     @test length(opt) == (nodeFusions = 6, nodeReductions = 1, nodeSplits = 1)
     #println("After reverting to the initial state:\n", opt)
+
+    @test is_valid(graph)
 end
 println("Node Reduction Unit Tests Complete!")

test/unit_tests_graph.jl

@@ -107,6 +107,8 @@ import MetagraphOptimization.partners
     @test length(graph.dirtyNodes) == 26
     @test length(graph.diff) == (addedNodes = 0, removedNodes = 0, addedEdges = 0, removedEdges = 0)
 
+    @test is_valid(graph)
+
     @test is_entry_node(d_PB)
     @test is_entry_node(d_PA)
     @test is_entry_node(d_PBp)
@@ -204,5 +206,7 @@ import MetagraphOptimization.partners
 
     operations = get_operations(graph)
     @test length(operations) == (nodeFusions = 10, nodeReductions = 0, nodeSplits = 0)
+
+    @test is_valid(graph)
 end
 println("Graph Unit Tests Complete!")