diff --git a/bench/bench_test.go b/bench/bench_test.go
new file mode 100644
index 0000000..0aacaa5
--- /dev/null
+++ b/bench/bench_test.go
@@ -0,0 +1,64 @@
+// Copyright 2022 wanderer <a_mirre at utb dot cz>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package bench
+
+import (
+	"testing"
+)
+
+// nolint: ifshort
+func TestMin_funcParams(t *testing.T) {
+	fP := funcParams{min: 0.123, max: 123.13432}
+	want := 0.123
+	got := fP.Min()
+
+	if want != got {
+		t.Errorf("wrong min, want: %f, got: %f", want, got)
+	}
+}
+
+// nolint: ifshort
+func TestMax_funcParams(t *testing.T) {
+	fP := funcParams{min: 87534104.143252, max: 43966223.521849}
+	want := 43966223.521849
+	got := fP.Max()
+
+	if want != got {
+		t.Errorf("wrong max, want: %f, got: %f", want, got)
+	}
+}
+
+// at the risk of testing implementation detail, these specific values are
+// pre-set boundaries of the respective bench functions and as such are
+// arguably important for the package/project.
+
+// nolint: ifshort
+func TestSchwefelParams(t *testing.T) {
+	want := funcParams{min: -500.0, max: 500.0}
+	got := SchwefelParams
+
+	if want != got {
+		t.Errorf("wrong SchwefelParams, want: %+v, got: %+v", want, got)
+	}
+}
+
+// nolint: ifshort
+func TestDeJong1Params(t *testing.T) {
+	want := funcParams{min: -5.0, max: 5.0}
+	got := DeJong1Params
+
+	if want != got {
+		t.Errorf("wrong DeJong1Params, want: %+v, got: %+v", want, got)
+	}
+}
+
+// nolint: ifshort
+func TestDeJong2Params(t *testing.T) {
+	want := funcParams{min: -5.0, max: 5.0}
+	got := DeJong2Params
+
+	if want != got {
+		t.Errorf("wrong DeJong2Params, want: %+v, got: %+v", want, got)
+	}
+}