Workaround 10 min bound on Travis

test/test_examples_tutorial_missings.jl

@@ -9,15 +9,47 @@ using Test
     @test eltype(eduction(xf_sum_columns(Float64[]), Any[])) <: Vector
 end
 
+function slow_test(f, title, limit)
+    @info "Running $title. Limit: $limit min."
+
+    code = """
+    sleep(60)
+    println("1 minute passed...")
+    flush(stdout)
+    for i in 2:$limit
+        sleep(60)
+        println("\$i minutes passed...")
+        flush(stdout)
+    end
+    """
+    # TODO: maybe terminate the parent process
+
+    cmd = `$(Base.julia_cmd()) --startup-file=no -e $code`
+    proc = run(pipeline(cmd, stdout=stdout), wait=false)
+
+    try
+        @time f()
+    finally
+        ch = Channel(ch -> wait(proc); csize=1)
+        for _ in 1:10
+            isready(ch) && break
+            kill(proc)
+            sleep(0.1)
+        end
+    end
+end
+
 @testset "slow compilation" begin
     # Excluding `missing` from the input vector seems to slows down
     # compilation a lot.
-    @info "Running slow compilation test with xf_fullextrema. ETA ~ 3 min."
-    @time @test mapfoldl(xf_fullextrema(), right, [1.0, 3.0, -1.0, 2.0]) ==
-        ((3, -1.0), (2, 3.0))
-    @info "Running slow compilation test with xf_argextrema. ETA ~ 5 min."
-    @time @test mapfoldl(xf_argextrema(), right, [1.0, 3.0, -1.0, 2.0]) ==
-        (3, 2)
+    slow_test("slow compilation test with xf_fullextrema", 20) do
+        @test mapfoldl(xf_fullextrema(), right, [1.0, 3.0, -1.0, 2.0]) ==
+            ((3, -1.0), (2, 3.0))
+    end
+    slow_test("slow compilation test with xf_argextrema", 20) do
+        @test mapfoldl(xf_argextrema(), right, [1.0, 3.0, -1.0, 2.0]) ==
+            (3, 2)
+    end
 end
 
 end  # module