add more heartbeats to tests to avoid CI timeout

test/tst_kfolds.jl

@@ -104,6 +104,8 @@ println("<HEARTBEAT>")
             @test 1 <= minimum(fv.test_indices[i-1]) < minimum(fv.test_indices[i]) < nobs(var)
         end
         @test cumobs == nobs(var)
+
+        println("<HEARTBEAT>")
     end
 
     # check that the stored obsdim is correct
@@ -131,6 +133,7 @@ println("<HEARTBEAT>")
         fv = FoldsView(var, kfolds(nobs(var), 10)...)
         @test length(fv) == 10
         @test getobs(fv[end]) == getobs(fv[length(fv)])
+        println("<HEARTBEAT>")
     end
     fv = FoldsView(X, kfolds(nobs(X))...)
     @test typeof(@inferred(fv[1])) <: Tuple
@@ -179,6 +182,7 @@ println("<HEARTBEAT>")
         @test length(unique(all_train_indices)) == 150
         @test length(unique(all_test_indices)) == 150
         @test length(all_test_indices) == 150
+        println("<HEARTBEAT>")
     end
     for var in (Xs, ys)
         all_train_indices = Array{Int,1}()
@@ -226,6 +230,7 @@ println("<HEARTBEAT>")
             @test sum(length.(kf.test_indices)) == nobs(var)
         end
     end
+    println("<HEARTBEAT>")
     for v1 in (X, Xv), v2 in (y, yv)
         kf = kfolds((v1, v2), k = 15)
         @test typeof(kf) <: FoldsView
@@ -270,6 +275,7 @@ println("<HEARTBEAT>")
             @test sum(length.(kf.test_indices)) == nobs(var)
         end
     end
+    println("<HEARTBEAT>")
     for v1 in (X, Xv), v2 in (y, yv)
         @test length(leaveout((v1, v2)).test_indices) == 150
         kf = leaveout((v1, v2), size = 10)