fix tests

Author: BatyLeo

test/subset_selection.jl

@@ -5,14 +5,13 @@
     k = 5
 
     b = SubsetSelectionBenchmark(; n=n, k=k)
-    b2 = SubsetSelectionBenchmark(; n=n, k=k, identity_mapping=false)
 
     io = IOBuffer()
     show(io, b)
     @test String(take!(io)) == "SubsetSelectionBenchmark(n=25, k=5)"
 
     dataset = generate_dataset(b, 50)
-    dataset2 = generate_dataset(b2, 50)
+    dataset2 = generate_dataset(b, 50; identity_mappinf=false)
     model = generate_statistical_model(b)
     maximizer = generate_maximizer(b)