fix: verify Gitea 1.27.3 and repair push mail templates

tools/preview/push_test.go

@@ -0,0 +1,67 @@
+package preview
+
+import (
+	"html/template"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"gitea-mail-templates/tools/config"
+)
+
+type testCommitID string
+
+func (id testCommitID) String() string { return string(id) }
+
+// Exercise the push-only branch with Gitea's nested commit data shape.
+// The normal preview fixture has no commits, so it cannot catch stale .ID paths.
+func TestPushCommitTemplates(t *testing.T) {
+	cfg, err := config.Load(filepath.Join("..", "data", "templates_config.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	const sha = "0123456789abcdef0123456789abcdef01234567"
+	data := cfg.Templates["default"].Params
+	data["ActionName"] = "push"
+	data["locale"] = Locale{}
+	comment := data["Comment"].(map[string]any)
+	comment["Commits"] = []any{map[string]any{
+		"UserCommit": map[string]any{
+			"GitCommit": map[string]any{
+				"ID":           testCommitID(sha),
+				"MessageTitle": "Test push commit",
+			},
+		},
+	}}
+	markSafeHTML(data)
+
+	themesDir := filepath.Join("..", "..", "themes")
+	themes, err := os.ReadDir(themesDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, theme := range themes {
+		if !theme.IsDir() {
+			continue
+		}
+		t.Run(theme.Name(), func(t *testing.T) {
+			path := filepath.Join(themesDir, theme.Name(), "mail", "repo", "issue", "default.tmpl")
+			content, err := os.ReadFile(path)
+			if err != nil {
+				t.Fatal(err)
+			}
+			tmpl, err := template.New("push").Funcs(TemplateFuncs).Parse(string(content))
+			if err != nil {
+				t.Fatal(err)
+			}
+			var html strings.Builder
+			if err := tmpl.Execute(&html, data); err != nil {
+				t.Fatal(err)
+			}
+			if !strings.Contains(html.String(), "/commit/"+sha) || !strings.Contains(html.String(), sha[:10]) {
+				t.Fatal("push commit link or abbreviated hash missing from rendered email")
+			}
+		})
+	}
+}