fix and test getting reasonable results when comparing more than 2 fu…

…nctions (invert permutation bug) (#138)

src/benchmarking.jl

@@ -136,7 +136,8 @@ function _benchmark_2(args1, setup, teardown, gc::Bool, evals::Int, warmup::Bool
         t[] = ti
         sample
     end
-    ntuple(i -> rp[p[i]], N), t[]
+    ip = N > 2 ? invperm(p) : p
+    ntuple(i -> rp[ip[i]], N), t[]
 end
 
 _div(a, b) = a == b == 0 ? zero(a/b) : a/b

test/runtests.jl

@@ -410,6 +410,14 @@ using Random: rand!
         @testset "Comparative" begin
             x,y = @b .01 sleep,sleep(10*_)
             @test x.time < y.time
+
+            x,y,z = @b sleep(.001),1+1,1+1
+            @test x.time > y.time
+            @test x.time > z.time
+
+            x,y,z = @b 1+1,sleep(.001),1+1
+            @test y.time > x.time
+            @test y.time > z.time
         end
     end