added tests

Makefile

@@ -44,3 +44,6 @@ install: buildlocal
 
 clean:
 	rm -rf $(tool) $(tool).1 releases
+
+test:
+	go test -v ./...

lib/helpers_test.go

@@ -0,0 +1,43 @@
+/*
+Copyright © 2022 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package lib
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestArrayContains(t *testing.T) {
+	var tests = []struct {
+		list   []int
+		search int
+		want   bool
+	}{
+		{[]int{1, 2, 3}, 2, true},
+	}
+
+	for _, tt := range tests {
+		testname := fmt.Sprintf("%d,%d,%t", tt.list, tt.search, tt.want)
+		t.Run(testname, func(t *testing.T) {
+			answer := contains(tt.list, tt.search)
+			if answer != tt.want {
+				t.Errorf("got %t, want %t", answer, tt.want)
+			}
+		})
+	}
+}