Add RenderGomponent function to echoutil package

internal/util/echoutil/render_gomponent.go

@@ -0,0 +1,24 @@
+package echoutil
+
+import (
+	"bytes"
+	"io"
+	"net/http"
+
+	"github.com/labstack/echo/v4"
+)
+
+type renderer interface {
+	Render(w io.Writer) error
+}
+
+// RenderGomponent renders a gomponents component to the response of
+// the echo context.
+func RenderGomponent(c echo.Context, code int, component renderer) error {
+	buf := bytes.Buffer{}
+	err := component.Render(&buf)
+	if err != nil {
+		return c.String(http.StatusInternalServerError, err.Error())
+	}
+	return c.HTML(code, buf.String())
+}

internal/util/echoutil/render_gomponent_test.go

@@ -0,0 +1,55 @@
+package echoutil
+
+import (
+	"errors"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/labstack/echo/v4"
+	"github.com/stretchr/testify/assert"
+)
+
+type okRenderer struct{}
+
+func (m *okRenderer) Render(w io.Writer) error {
+	_, err := w.Write([]byte("render ok"))
+	return err
+}
+
+type nokRenderer struct{}
+
+func (m *nokRenderer) Render(w io.Writer) error {
+	return errors.New("render nok")
+}
+
+func TestRenderGomponent(t *testing.T) {
+	// Setup renderer mocks
+	okRendererIns := new(okRenderer)
+	nokRendererIns := new(nokRenderer)
+
+	t.Run("Successful Render", func(t *testing.T) {
+		e := echo.New()
+		req := httptest.NewRequest(http.MethodGet, "/", nil)
+		rec := httptest.NewRecorder()
+		c := e.NewContext(req, rec)
+
+		err := RenderGomponent(c, http.StatusOK, okRendererIns)
+		assert.NoError(t, err)
+		assert.Equal(t, http.StatusOK, c.Response().Status)
+		assert.Equal(t, "render ok", rec.Body.String())
+	})
+
+	t.Run("Unsuccessful Render", func(t *testing.T) {
+		e := echo.New()
+		req := httptest.NewRequest(http.MethodGet, "/", nil)
+		rec := httptest.NewRecorder()
+		c := e.NewContext(req, rec)
+
+		err := RenderGomponent(c, http.StatusOK, nokRendererIns)
+		assert.NoError(t, err)
+		assert.Equal(t, http.StatusInternalServerError, rec.Code)
+		assert.Equal(t, "render nok", rec.Body.String())
+	})
+}