Adding upstream version 0.28.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tools/template/renderer_test.go

@@ -0,0 +1,63 @@
+package template
+
+import (
+	"errors"
+	"html/template"
+	"testing"
+)
+
+func TestRendererRender(t *testing.T) {
+	tpl, _ := template.New("").Parse("Hello {{.Name}}!")
+	tpl.Option("missingkey=error") // enforce execute errors
+
+	scenarios := map[string]struct {
+		renderer       *Renderer
+		data           any
+		expectedHasErr bool
+		expectedResult string
+	}{
+		"with nil template": {
+			&Renderer{},
+			nil,
+			true,
+			"",
+		},
+		"with parse error": {
+			&Renderer{
+				template:   tpl,
+				parseError: errors.New("test"),
+			},
+			nil,
+			true,
+			"",
+		},
+		"with execute error": {
+			&Renderer{template: tpl},
+			nil,
+			true,
+			"",
+		},
+		"no error": {
+			&Renderer{template: tpl},
+			struct{ Name string }{"world"},
+			false,
+			"Hello world!",
+		},
+	}
+
+	for name, s := range scenarios {
+		t.Run(name, func(t *testing.T) {
+			result, err := s.renderer.Render(s.data)
+
+			hasErr := err != nil
+
+			if s.expectedHasErr != hasErr {
+				t.Fatalf("Expected hasErr %v, got %v (%v)", s.expectedHasErr, hasErr, err)
+			}
+
+			if s.expectedResult != result {
+				t.Fatalf("Expected result %v, got %v", s.expectedResult, result)
+			}
+		})
+	}
+}