diff --git a/pkg/database/export_test.go b/pkg/database/export_test.go
new file mode 100644
index 0000000..739be73
--- /dev/null
+++ b/pkg/database/export_test.go
@@ -0,0 +1,6 @@
+package database
+
+var (
+	StrToASN = strToASN
+	StrIndex = strIndex
+)
diff --git a/pkg/database/resolver_test.go b/pkg/database/resolver_test.go
new file mode 100644
index 0000000..3b82b85
--- /dev/null
+++ b/pkg/database/resolver_test.go
@@ -0,0 +1,54 @@
+package database_test
+
+import (
+	"testing"
+
+	"github.com/danroc/geoblock/pkg/database"
+)
+
+func TestStrIndex(t *testing.T) {
+	tests := []struct {
+		data     []string
+		index    int
+		expected string
+	}{
+		{[]string{"a", "b", "c"}, 0, "a"},
+		{[]string{"a", "b", "c"}, 1, "b"},
+		{[]string{"a", "b", "c"}, 2, "c"},
+		{[]string{"a", "b", "c"}, 3, ""},
+		{[]string{"a", "b", "c"}, -1, ""},
+		{[]string{}, 0, ""},
+	}
+
+	for _, tt := range tests {
+		t.Run("", func(t *testing.T) {
+			result := database.StrIndex(tt.data, tt.index)
+			if result != tt.expected {
+				t.Errorf("got %q, want %q", result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestStrToASN(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected uint32
+	}{
+		{"12345", 12345},
+		{"0", 0},
+		{"4294967295", 4294967295},
+		{"invalid", database.ReservedAS0},
+		{"", database.ReservedAS0},
+		{"-1", database.ReservedAS0},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			result := database.StrToASN(tt.input)
+			if result != tt.expected {
+				t.Errorf("got %d, want %d", result, tt.expected)
+			}
+		})
+	}
+}