diff --git a/slogex_test.go b/slogex_test.go
new file mode 100644
index 0000000..45b05fc
--- /dev/null
+++ b/slogex_test.go
@@ -0,0 +1,68 @@
+package stacktrace
+
+import (
+	"fmt"
+	"log/slog"
+	"reflect"
+	"testing"
+)
+
+func TestErrToSlogAttr(t *testing.T) {
+	type args struct {
+		err  error
+		opts []TracesOpt
+	}
+	tests := []struct {
+		name string
+		args args
+		want slog.Attr
+	}{
+		{
+			name: "Test simple",
+			args: args{
+				err:  New("error message", "location.raml"),
+				opts: []TracesOpt{},
+			},
+			want: slog.Group(
+				"tracebacks", "traces", []slog.Attr{
+					slog.Group(
+						"0", "stack", []slog.Attr{
+							slog.Group(
+								"0",
+								slog.String("type", "parsing"),
+								slog.String("severity", "error"),
+								slog.String("position", "location.raml:1"),
+								slog.String("message", "error message"),
+							),
+						},
+					),
+				},
+			),
+		},
+		{
+			name: "Test is not a stacktrace",
+			args: args{
+				err:  fmt.Errorf("error message"),
+				opts: []TracesOpt{},
+			},
+			want: slog.String("error", "error message"),
+		},
+		{
+			name: "Test nil err",
+			args: args{
+				err:  nil,
+				opts: []TracesOpt{},
+			},
+			want: slog.Attr{},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := ErrToSlogAttr(tt.args.err, tt.args.opts...); !reflect.DeepEqual(got, tt.want) {
+				slog.Error("got", got)
+				slog.Error("want", tt.want)
+				t.Errorf("ErrToSlogAttr() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}