Add execution test

test/runtests.jl

@@ -8,6 +8,7 @@ using Test
     include("unit_tests_properties.jl")
     include("node_reduction.jl")
     include("unit_tests_graph.jl")
+    include("unit_tests_execution.jl")
 
     include("known_graphs.jl")
 end

test/unit_tests_execution.jl

@@ -0,0 +1,31 @@
+import MetagraphOptimization.A
+import MetagraphOptimization.B
+import MetagraphOptimization.ParticleType
+
+@testset "Unit Tests Graph" begin
+    particles = Dict{ParticleType, Vector{Particle}}(
+        (
+            A => [
+                Particle(0.823648, 0.0, 0.0, 0.823648, A),
+                Particle(0.823648, -0.835061, -0.474802, 0.277915, A),
+            ]
+        ),
+        (
+            B => [
+                Particle(0.823648, 0.0, 0.0, -0.823648, B),
+                Particle(0.823648, 0.835061, 0.474802, -0.277915, B),
+            ]
+        ),
+    )
+
+    expected_result = 5.5320567694746876e-5
+
+    for _ in 1:10   # test in a loop because graph layout should not change the result
+        graph = parse_abc(joinpath(@__DIR__, "..", "input", "AB->AB.txt"))
+        @test isapprox(execute(graph, particles), expected_result; rtol = 0.001)
+
+        code = MetagraphOptimization.gen_code(graph)
+        @test isapprox(execute(code, particles), expected_result; rtol = 0.001)
+    end
+end
+println("Execution Unit Tests Complete!")