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package xun
import (
"html/template"
"io/fs"
"strings"
"testing"
"testing/fstest"
"github.com/stretchr/testify/require"
)
// TestLoadEmptyTemplate tests loading an empty template file
func TestLoadEmptyTemplate(t *testing.T) {
fsys := fstest.MapFS{
"pages/empty.html": &fstest.MapFile{
Data: []byte(``), // Empty file
},
}
templates := make(map[string]*HtmlTemplate)
fm := template.FuncMap{}
page := NewHtmlTemplate("pages/empty", "pages/empty.html")
err := page.Load(fsys, templates, fm)
require.NoError(t, err)
// Empty template should load successfully
var buf strings.Builder
err = page.Execute(&buf, nil)
require.NoError(t, err)
require.Empty(t, buf.String())
}
// TestLoadInvalidTemplate tests loading a template with syntax errors
func TestLoadInvalidTemplate(t *testing.T) {
fsys := fstest.MapFS{
"pages/invalid.html": &fstest.MapFile{
Data: []byte(`<html>{{.Invalid syntax}}</html>`),
},
}
templates := make(map[string]*HtmlTemplate)
fm := template.FuncMap{}
page := NewHtmlTemplate("pages/invalid", "pages/invalid.html")
err := page.Load(fsys, templates, fm)
require.Error(t, err)
require.Contains(t, err.Error(), "template")
}
// TestLoadLayoutNotFound tests when layout is specified but not found in templates registry
func TestLoadLayoutNotFound(t *testing.T) {
fsys := fstest.MapFS{
"pages/test.html": &fstest.MapFile{
Data: []byte(`<!--layout:nonexistent--><p>Content</p>`),
},
}
templates := make(map[string]*HtmlTemplate)
fm := template.FuncMap{}
page := NewHtmlTemplate("pages/test", "pages/test.html")
err := page.Load(fsys, templates, fm)
require.NoError(t, err)
// Layout not found, but loading should succeed (just won't use layout)
require.Equal(t, "layouts/nonexistent", page.layout)
// Execute should work (will try to use layout that doesn't exist and fail)
var buf strings.Builder
err = page.Execute(&buf, nil)
require.Error(t, err) // Will fail because layout template doesn't exist
}
// TestLoadEmptyLayoutName tests when layout comment exists but name is empty
func TestLoadEmptyLayoutName(t *testing.T) {
fsys := fstest.MapFS{
"pages/test.html": &fstest.MapFile{
Data: []byte(`<!--layout: --><p>Content</p>`),
},
}
templates := make(map[string]*HtmlTemplate)
fm := template.FuncMap{}
page := NewHtmlTemplate("pages/test", "pages/test.html")
err := page.Load(fsys, templates, fm)
require.NoError(t, err)
// Empty layout name should result in no layout
require.Empty(t, page.layout)
var buf strings.Builder
err = page.Execute(&buf, nil)
require.NoError(t, err)
require.Contains(t, buf.String(), "<p>Content</p>")
}
// TestLoadLayoutCommentNewline tests when layout comment has newline before closing
func TestLoadLayoutCommentNewline(t *testing.T) {
fsys := fstest.MapFS{
"pages/test.html": &fstest.MapFile{
Data: []byte("<!--layout:test\n--><p>Content</p>"),
},
}
templates := make(map[string]*HtmlTemplate)
fm := template.FuncMap{}
page := NewHtmlTemplate("pages/test", "pages/test.html")
err := page.Load(fsys, templates, fm)
require.NoError(t, err)
// Newline should break layout parsing
require.Empty(t, page.layout)
}
// TestLoadWithDependencies tests loading templates with define blocks
func TestLoadWithDependencies(t *testing.T) {
fsys := fstest.MapFS{
"components/header.html": &fstest.MapFile{
Data: []byte(`{{define "header"}}<header>Header</header>{{end}}`),
},
"pages/test.html": &fstest.MapFile{
// Using {{define}} in the same file creates dependencies
Data: []byte(`<html>{{define "nav"}}<nav>Nav</nav>{{end}}{{template "nav" .}}</html>`),
},
}
templates := make(map[string]*HtmlTemplate)
fm := template.FuncMap{}
// Load component
header := NewHtmlTemplate("components/header", "components/header.html")
err := header.Load(fsys, templates, fm)
require.NoError(t, err)
templates["components/header"] = header
// Check that component's define created a dependency
require.Contains(t, header.dependencies, "header")
// Load page with inline define
page := NewHtmlTemplate("pages/test", "pages/test.html")
err = page.Load(fsys, templates, fm)
require.NoError(t, err)
// Check that inline define was detected as dependency
require.Contains(t, page.dependencies, "nav")
var buf strings.Builder
err = page.Execute(&buf, nil)
require.NoError(t, err)
require.Contains(t, buf.String(), "<nav>Nav</nav>")
}
// TestLoadWithMissingDependency tests when template references undefined template
func TestLoadWithMissingDependency(t *testing.T) {
fsys := fstest.MapFS{
"pages/test.html": &fstest.MapFile{
Data: []byte(`<html>{{template "nonexistent" .}}</html>`),
},
}
templates := make(map[string]*HtmlTemplate)
fm := template.FuncMap{}
page := NewHtmlTemplate("pages/test", "pages/test.html")
err := page.Load(fsys, templates, fm)
require.NoError(t, err)
// Load succeeds, but Execute will fail
var buf strings.Builder
err = page.Execute(&buf, nil)
require.Error(t, err)
require.Contains(t, err.Error(), "nonexistent")
}
// TestReloadWithDependents tests reloading a template that has dependents
func TestReloadWithDependents(t *testing.T) {
fsys := fstest.MapFS{
"layouts/main.html": &fstest.MapFile{
Data: []byte(`<html>{{block "content" .}}Default{{end}}</html>`),
},
"pages/test.html": &fstest.MapFile{
Data: []byte(`<!--layout:main-->{{define "content"}}Test{{end}}`),
},
}
templates := make(map[string]*HtmlTemplate)
fm := template.FuncMap{}
// Load layout
layout := NewHtmlTemplate("layouts/main", "layouts/main.html")
err := layout.Load(fsys, templates, fm)
require.NoError(t, err)
templates["layouts/main"] = layout
// Load page (becomes dependent of layout)
page := NewHtmlTemplate("pages/test", "pages/test.html")
err = page.Load(fsys, templates, fm)
require.NoError(t, err)
// Register the dependency relationship
layout.dependents["pages/test"] = page
// Reload layout should also reload page
err = layout.Reload(fsys, templates, fm)
require.NoError(t, err)
// Page should still work
var buf strings.Builder
err = page.Execute(&buf, nil)
require.NoError(t, err)
require.Contains(t, buf.String(), "Test")
}
// TestReloadWithMissingDependent tests reloading when a dependent file no longer exists
func TestReloadWithMissingDependent(t *testing.T) {
// Initial filesystem with both files
fsys1 := fstest.MapFS{
"components/button.html": &fstest.MapFile{
Data: []byte(`{{define "button"}}<button>Click</button>{{end}}`),
},
"pages/test.html": &fstest.MapFile{
Data: []byte(`<html>{{template "button" .}}</html>`),
},
}
templates := make(map[string]*HtmlTemplate)
fm := template.FuncMap{}
button := NewHtmlTemplate("components/button", "components/button.html")
err := button.Load(fsys1, templates, fm)
require.NoError(t, err)
templates["components/button"] = button
page := NewHtmlTemplate("pages/test", "pages/test.html")
err = page.Load(fsys1, templates, fm)
require.NoError(t, err)
button.dependents["pages/test"] = page
// New filesystem without pages/test.html
fsys2 := fstest.MapFS{
"components/button.html": &fstest.MapFile{
Data: []byte(`{{define "button"}}<button>Updated</button>{{end}}`),
},
}
// Reload should succeed and remove the missing dependent
err = button.Reload(fsys2, templates, fm)
require.NoError(t, err)
// Dependent should be removed
require.NotContains(t, button.dependents, "pages/test")
}
// TestReloadDependentError tests reloading when dependent has a non-NotExist error
func TestReloadDependentError(t *testing.T) {
fsys1 := fstest.MapFS{
"components/button.html": &fstest.MapFile{
Data: []byte(`{{define "button"}}<button>Click</button>{{end}}`),
},
"pages/test.html": &fstest.MapFile{
Data: []byte(`<html>{{template "button" .}}</html>`),
},
}
templates := make(map[string]*HtmlTemplate)
fm := template.FuncMap{}
button := NewHtmlTemplate("components/button", "components/button.html")
err := button.Load(fsys1, templates, fm)
require.NoError(t, err)
templates["components/button"] = button
page := NewHtmlTemplate("pages/test", "pages/test.html")
err = page.Load(fsys1, templates, fm)
require.NoError(t, err)
button.dependents["pages/test"] = page
// New filesystem with invalid syntax in dependent
fsys2 := fstest.MapFS{
"components/button.html": &fstest.MapFile{
Data: []byte(`{{define "button"}}<button>Updated</button>{{end}}`),
},
"pages/test.html": &fstest.MapFile{
Data: []byte(`<html>{{.Invalid syntax}}</html>`),
},
}
// Reload should fail with parse error (not NotExist error)
err = button.Reload(fsys2, templates, fm)
require.Error(t, err)
require.NotErrorIs(t, err, fs.ErrNotExist)
}
// TestLoadFileReadError tests error when file cannot be read
func TestLoadFileReadError(t *testing.T) {
fsys := fstest.MapFS{
// File doesn't exist
}
templates := make(map[string]*HtmlTemplate)
fm := template.FuncMap{}
page := NewHtmlTemplate("pages/missing", "pages/missing.html")
err := page.Load(fsys, templates, fm)
require.Error(t, err)
require.ErrorIs(t, err, fs.ErrNotExist)
}