diff --git a/internal/core/errors_test.go b/internal/core/errors_test.go
new file mode 100644
index 0000000..76ee86a
--- /dev/null
+++ b/internal/core/errors_test.go
@@ -0,0 +1,23 @@
+package core
+
+import (
+	"errors"
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewError(t *testing.T) {
+	err := NewHTTPError(http.StatusBadRequest, "MyError", errors.New("test"))
+	assert.Equal(t, http.StatusBadRequest, err.Code)
+	assert.Equal(t, "MyError", err.Error())
+	assert.Equal(t, errors.New("test"), err.Unwrap())
+}
+
+func TestNewInternalServerError(t *testing.T) {
+	err := NewInternalServerError(errors.New("test"))
+	assert.Equal(t, http.StatusInternalServerError, err.Code)
+	assert.Equal(t, "Internal server error", err.Error())
+	assert.Equal(t, errors.New("test"), err.Unwrap())
+}