Added tests to the spool package, and reworked the code around that.

spool/serialize_test.go

@@ -0,0 +1,33 @@
+package spool
+
+import (
+	"bareos-zabbix-check/job"
+	"bytes"
+	"testing"
+)
+
+func TestSerialize(t *testing.T) {
+	type args struct {
+		jobs []job.Job
+	}
+	tests := []struct {
+		name       string
+		args       args
+		wantHandle string
+		wantErr    bool
+	}{
+		{"One job", args{[]job.Job{{Name: "a", Timestamp: 1}}}, "a,1\n", false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			handle := &bytes.Buffer{}
+			if err := Serialize(handle, tt.args.jobs); (err != nil) != tt.wantErr {
+				t.Errorf("Serialize() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if gotHandle := handle.String(); gotHandle != tt.wantHandle {
+				t.Errorf("Serialize() = %v, want %v", gotHandle, tt.wantHandle)
+			}
+		})
+	}
+}