Show the MIT licence in the page footers (closes #119)

version.License, which the home and status page footers show, still
said WTFPL after LICENSE and the README moved to MIT. It now says MIT.
A test renders both pages and expects each footer to name MIT and not
WTFPL.

Model: opus-5-5

internal/templates/templates_test.go

@@ -0,0 +1,54 @@
+package templates_test
+
+import (
+	"bytes"
+	"html/template"
+	"strings"
+	"testing"
+
+	"git.eeqj.de/sneak/routewatch/internal/templates"
+)
+
+// TestFooterLicense renders the home and status pages and expects each footer
+// to name the licence in LICENSE, MIT, and not WTFPL.
+func TestFooterLicense(t *testing.T) {
+	t.Parallel()
+
+	const (
+		license      = "MIT"
+		wrongLicense = "WTFPL"
+	)
+
+	pages := map[string]*template.Template{
+		"index":  templates.IndexTemplate(),
+		"status": templates.StatusTemplate(),
+	}
+
+	for name, tmpl := range pages {
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			var page bytes.Buffer
+
+			err := tmpl.Execute(&page, struct{ CSPNonce string }{})
+			if err != nil {
+				t.Fatalf("rendering the page: %v", err)
+			}
+
+			_, footer, found := strings.Cut(page.String(), "<footer")
+			if !found {
+				t.Fatal("the page has no footer")
+			}
+
+			footer, _, _ = strings.Cut(footer, "</footer>")
+
+			if !strings.Contains(footer, license) {
+				t.Errorf("footer does not name %s: %q", license, footer)
+			}
+
+			if strings.Contains(footer, wrongLicense) {
+				t.Errorf("footer names %s: %q", wrongLicense, footer)
+			}
+		})
+	}
+}

internal/version/version.go

@@ -19,8 +19,8 @@ const (
 	Author = "@sneak"
 	// AuthorURL is the author's website
 	AuthorURL = "https://sneak.berlin"
-	// License is the program license
-	License = "WTFPL"
+	// License is the program license, as LICENSE grants it
+	License = "MIT"
 	// RepoURL is the git repository URL
 	RepoURL = "https://git.eeqj.de/sneak/routewatch"
 )