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package handlers
import (
"fmt"
"html/template"
"io"
)
// Renderer abstracts template rendering for testability.
type Renderer interface {
Render(w io.Writer, name string, data interface{}) error
}
// TemplateRenderer wraps *template.Template to implement Renderer.
type TemplateRenderer struct {
templates *template.Template
}
// NewTemplateRenderer creates a new TemplateRenderer.
func NewTemplateRenderer(tmpl *template.Template) *TemplateRenderer {
return &TemplateRenderer{templates: tmpl}
}
// Render executes the named template with the given data.
func (r *TemplateRenderer) Render(w io.Writer, name string, data interface{}) error {
if r.templates == nil {
return fmt.Errorf("templates not loaded")
}
return r.templates.ExecuteTemplate(w, name, data)
}
// Compile-time interface check
var _ Renderer = (*TemplateRenderer)(nil)
// MockRenderer is a test double for Renderer.
type MockRenderer struct {
RenderFunc func(w io.Writer, name string, data interface{}) error
Calls []RenderCall
}
// RenderCall records a call to Render.
type RenderCall struct {
Name string
Data interface{}
}
// Render implements Renderer for testing.
func (m *MockRenderer) Render(w io.Writer, name string, data interface{}) error {
m.Calls = append(m.Calls, RenderCall{Name: name, Data: data})
if m.RenderFunc != nil {
return m.RenderFunc(w, name, data)
}
fmt.Fprintf(w, "rendered:%s", name)
return nil
}
// NewMockRenderer creates a new MockRenderer.
func NewMockRenderer() *MockRenderer {
return &MockRenderer{}
}
// Compile-time interface check
var _ Renderer = (*MockRenderer)(nil)
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