Reorganize test folder

test/model/build_test.jl

@@ -0,0 +1,37 @@
+# UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+# Copyright (C) 2020, UChicago Argonne, LLC. All rights reserved.
+# Released under the modified BSD license. See COPYING.md for more details.
+
+using UnitCommitment, LinearAlgebra, Cbc, JuMP
+
+@testset "build_model" begin
+    instance = UnitCommitment.read_benchmark("test/case14")
+    for line in instance.lines, t in 1:4
+        line.normal_flow_limit[t] = 10.0
+    end
+    optimizer = optimizer_with_attributes(Cbc.Optimizer, "logLevel" => 0)
+    model = UnitCommitment.build_model(
+        instance = instance,
+        optimizer = optimizer,
+        variable_names = true,
+    )
+    @test name(model[:is_on]["g1", 1]) == "is_on[g1,1]"
+
+    # Optimize and retrieve solution
+    UnitCommitment.optimize!(model)
+    solution = UnitCommitment.solution(model)
+
+    # Write solution to a file
+    filename = tempname()
+    UnitCommitment.write(filename, solution)
+    loaded = JSON.parsefile(filename)
+    @test length(loaded["Is on"]) == 6
+
+    # Verify solution
+    @test UnitCommitment.validate(instance, solution)
+
+    # Reoptimize with fixed solution
+    UnitCommitment.fix!(model, solution)
+    UnitCommitment.optimize!(model)
+    @test UnitCommitment.validate(instance, solution)
+end