Silence test outputs

[simonbowly]

Continuing from #456

[codecov]

Codecov Report

Merging #457 (24aafc9) into master (1648d6e) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #457      +/-   ##
==========================================
+ Coverage   59.22%   59.32%   +0.09%     
==========================================
  Files           8        8              
  Lines        3713     3717       +4     
==========================================
+ Hits         2199     2205       +6     
+ Misses       1514     1512       -2     

Impacted Files	Coverage Δ
src/MOI_wrapper/MOI_wrapper.jl	88.88% <100.00%> (+0.02%)	⬆️
src/gen95/libgrb_api.jl	26.77% <0.00%> (+0.41%)	⬆️

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[odow]

I rebased because I saw this was a few commits behind master. But it looks like the prints are coming from

Gurobi.jl/test/MOI/MOI_wrapper.jl

Lines 180 to 217 in 1648d6e

	function test_MULTI_ENV_automatic_env()
	model_1 = Gurobi.Optimizer()
	model_2 = Gurobi.Optimizer()
	@test model_1.env !== model_2.env
	# Check that env is finalized with model when not supplied manually.
	finalize(model_1)
	@test model_1.env.ptr_env == C_NULL
	return
	end
	function test_user_provided_env_empty()
	model = Gurobi.Optimizer(GRB_ENV)
	@test model.env === GRB_ENV
	@test GRB_ENV.ptr_env != C_NULL
	MOI.empty!(model)
	@test model.env === GRB_ENV
	@test GRB_ENV.ptr_env != C_NULL
	return
	end
	function test_MULTI_ENV_automatic_env_empty()
	model = Gurobi.Optimizer()
	env = model.env
	MOI.empty!(model)
	@test model.env === env
	@test env.ptr_env != C_NULL
	return
	end
	function test_MULTI_ENV_manual_finalize()
	env = Gurobi.Env()
	model = Gurobi.Optimizer(env)
	finalize(env)
	@test env.finalize_called
	finalize(model)
	@test env.ptr_env == C_NULL
	return
	end

This creates new optimizers and doesn't set silent, so we're seeing the expected behavior.

[odow]

Thanks Simon.