fix(context): throws ErrViewNotFound when no view is available (#37)

app.go

@@ -389,6 +389,12 @@ func (app *App) createHandler(pattern string, hf HandleFunc, opts []RoutingOptio
 			return
 		}
 
+		if errors.Is(err, ErrViewNotFound) {
+			ctx.WriteStatus(http.StatusNotFound)
+			ctx.Response.Write([]byte("View Not Found")) // nolint: errcheck
+			return
+		}
+
 		logID := nextLogID()
 		ctx.WriteHeader("X-Log-Id", logID)
 		ctx.WriteStatus(http.StatusInternalServerError)

context.go

@@ -74,6 +74,9 @@ func (c *Context) View(data any, options ...string) error {
 	// no any viewer is matched
 	if !ok {
 		if v == nil {
+			if len(c.Routing.Viewers) == 0 {
+				return ErrViewNotFound
+			}
 			v = c.Routing.Viewers[0] // use the first viewer as a fallback when no viewer is matched or specified by name
 		}
 	}

context_test.go

@@ -112,6 +112,10 @@ func TestMixedViewers(t *testing.T) {
 		})
 	})
 
+	app.Get("/view404", func(c *Context) error {
+		return c.View(nil)
+	}, WithViewer()) // delete default viewer
+
 	app.Start()
 	defer app.Close()
 
@@ -140,6 +144,16 @@ func TestMixedViewers(t *testing.T) {
 		resp.Body.Close()
 	})
 
+	t.Run("view_not_found", func(t *testing.T) {
+		req, err := http.NewRequest("GET", srv.URL+"/view404", nil)
+		req.Header.Set("Accept", "text/html")
+		require.NoError(t, err)
+		resp, err := client.Do(req)
+		require.NoError(t, err)
+		require.Equal(t, http.StatusNotFound, resp.StatusCode)
+		resp.Body.Close()
+	})
+
 	t.Run("data_bind_with_html_and_json_should_both_work", func(t *testing.T) {
 		req, err := http.NewRequest("GET", srv.URL+"/list", nil)
 		req.Header.Set("Accept", "text/html, */*")

errs.go

@@ -3,5 +3,6 @@ package xun
 import "errors"
 
 var (
-	ErrCancelled = errors.New("xun: request_cancelled")
+	ErrCancelled    = errors.New("xun: request_cancelled")
+	ErrViewNotFound = errors.New("xun: view_not_found")
 )