Implement FileInstance

test/instance/file_test.jl

@@ -0,0 +1,26 @@
+#  MIPLearn: Extensible Framework for Learning-Enhanced Mixed-Integer Optimization
+#  Copyright (C) 2020-2021, UChicago Argonne, LLC. All rights reserved.
+#  Released under the modified BSD license. See COPYING.md for more details.
+
+using JuMP
+using MIPLearn
+using Gurobi
+
+@testset "FileInstance" begin
+    @testset "solve" begin
+        model = Model()
+        @variable(model, x, Bin)
+        @variable(model, y, Bin)
+        @objective(model, Max, x + y)
+        instance = JuMPInstance(model)
+        filename = tempname()
+        save(filename, instance)
+
+        file_instance = FileInstance(filename)
+        solver = LearningSolver(Gurobi.Optimizer)
+        solve!(solver, file_instance)
+
+        loaded = load_jump_instance(filename)
+        @test length(loaded.py.samples) == 1
+    end    
+end