Add render tests

internal/render/render.go

@@ -2,9 +2,9 @@ package render
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"html/template"
-	"log"
 	"net/http"
 	"path/filepath"
 
@@ -32,7 +32,7 @@ func AddDefaultData(td *models.TemplateData, r *http.Request) *models.TemplateDa
 }
 
 // RenderTemplate renders templates using html/template
-func RenderTemplate(w http.ResponseWriter, r *http.Request, tmpl string, td *models.TemplateData) {
+func RenderTemplate(w http.ResponseWriter, r *http.Request, tmpl string, td *models.TemplateData) error {
 	var tc map[string]*template.Template
 
 	if app.UseCache {
@@ -44,7 +44,7 @@ func RenderTemplate(w http.ResponseWriter, r *http.Request, tmpl string, td *mod
 
 	t, ok := tc[tmpl]
 	if !ok {
-		log.Fatal("Could not get template from template cache")
+		return errors.New("can't get template from cache")
 	}
 
 	buf := new(bytes.Buffer)
@@ -55,7 +55,10 @@ func RenderTemplate(w http.ResponseWriter, r *http.Request, tmpl string, td *mod
 	_, err := buf.WriteTo(w)
 	if err != nil {
 		fmt.Println("Error writing template to browser", err)
+		return err
 	}
+
+	return nil
 }
 
 // CreateTemplateCache creates a template cache as a map

internal/render/render_test.go

@@ -24,6 +24,33 @@ func TestAddDefaultData(t *testing.T) {
 	}
 }
 
+func TestRenderTemplate(t *testing.T) {
+	pathToTemplates = "./../../templates"
+	tc, err := CreateTemplateCache()
+	if err != nil {
+		t.Error(err)
+	}
+
+	app.TemplateCache = tc
+
+	r, err := getSession()
+	if err != nil {
+		t.Error(err)
+	}
+
+	var ww myWriter
+
+	err = RenderTemplate(&ww, r, "home.page.html", &models.TemplateData{})
+	if err != nil {
+		t.Error("error writing template to browser")
+	}
+
+	err = RenderTemplate(&ww, r, "non-existent.page.html", &models.TemplateData{})
+	if err == nil {
+		t.Error("rendered template that does not exist")
+	}
+}
+
 func getSession() (*http.Request, error) {
 	r, err := http.NewRequest("GET", "/some-url", nil)
 	if err != nil {
@@ -36,3 +63,15 @@ func getSession() (*http.Request, error) {
 
 	return r, nil
 }
+
+func TestNewTemplates(t *testing.T) {
+	NewTemplates(app)
+}
+
+func TestCreateTemplateCache(t *testing.T) {
+	pathToTemplates = "./../../templates"
+	_, err := CreateTemplateCache()
+	if err != nil {
+		t.Error(err)
+	}
+}

internal/render/setup_test.go

@@ -34,3 +34,19 @@ func TestMain(m *testing.M) {
 
 	os.Exit(m.Run())
 }
+
+type myWriter struct{}
+
+func (tw *myWriter) Header() http.Header {
+	var h http.Header
+	return h
+}
+
+func (tw *myWriter) WriteHeader(i int) {
+
+}
+
+func (tw *myWriter) Write(b []byte) (int, error) {
+	length := len(b)
+	return length, nil
+}