fix(html): default nil render contexts

Co-Authored-By: Virgil <virgil@lethean.io>

layout.go

@@ -109,6 +109,9 @@ func (l *Layout) Render(ctx *Context) string {
 	if l == nil {
 		return ""
 	}
+	if ctx == nil {
+		ctx = NewContext()
+	}
 
 	b := newTextBuilder()
 

layout_test.go

@@ -137,3 +137,13 @@ func TestLayout_Methods_NilLayout_Ugly(t *testing.T) {
 		t.Fatalf("nil layout render should be empty, got %q", got)
 	}
 }
+
+func TestLayout_Render_NilContext_Good(t *testing.T) {
+	layout := NewLayout("C").C(Raw("content"))
+
+	got := layout.Render(nil)
+	want := `<main role="main" data-block="C-0">content</main>`
+	if got != want {
+		t.Fatalf("layout.Render(nil) = %q, want %q", got, want)
+	}
+}

responsive.go

@@ -38,6 +38,9 @@ func (r *Responsive) Render(ctx *Context) string {
 	if r == nil {
 		return ""
 	}
+	if ctx == nil {
+		ctx = NewContext()
+	}
 
 	b := newTextBuilder()
 	for _, v := range r.variants {

responsive_test.go

@@ -99,3 +99,14 @@ func TestResponsive_Variant_NilResponsive_Ugly(t *testing.T) {
 		t.Fatalf("unexpected output from nil receiver Variant path: %q", output)
 	}
 }
+
+func TestResponsive_Render_NilContext_Good(t *testing.T) {
+	r := NewResponsive().
+		Variant("mobile", NewLayout("C").C(Raw("content")))
+
+	got := r.Render(nil)
+	want := `<div data-variant="mobile"><main role="main" data-block="C-0">content</main></div>`
+	if got != want {
+		t.Fatalf("responsive.Render(nil) = %q, want %q", got, want)
+	}
+}