chore: sync from fn-registry agent

format_test.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"strings"
+	"testing"
+
+	"fn-registry/registry"
+)
+
+func TestRenderFunctionMarkdown(t *testing.T) {
+	f := &registry.Function{
+		ID:          "filter_slice_go_core",
+		Name:        "filter_slice",
+		Kind:        "function",
+		Lang:        "go",
+		Domain:      "core",
+		Purity:      "pure",
+		Version:     "1.0.0",
+		Signature:   "func FilterSlice[T any](xs []T, pred func(T) bool) []T",
+		Description: "Filtra un slice.",
+		Tags:        []string{"slice", "functional"},
+		Code:        "func FilterSlice[T any](xs []T, pred func(T) bool) []T { return nil }",
+		FilePath:    "functions/core/filter_slice.go",
+	}
+	out := renderFunctionMarkdown(f)
+	wants := []string{
+		"# filter_slice_go_core",
+		"- name: filter_slice",
+		"- purity: pure",
+		"- signature: `func FilterSlice",
+		"## code\n\n```go",
+		"Filtra un slice.",
+	}
+	for _, w := range wants {
+		if !strings.Contains(out, w) {
+			t.Errorf("markdown missing %q\n---\n%s", w, out)
+		}
+	}
+}
+
+func TestLangFence(t *testing.T) {
+	cases := map[string]string{"go": "go", "py": "python", "ts": "typescript", "bash": "bash", "ps": "powershell", "cpp": "cpp"}
+	for in, want := range cases {
+		if got := langFence(in); got != want {
+			t.Errorf("langFence(%q) = %q, want %q", in, got, want)
+		}
+	}
+}
+
+func TestTruncate(t *testing.T) {
+	if got := truncate("abc", 10); got != "abc" {
+		t.Errorf("no-trunc: %q", got)
+	}
+	if got := truncate("abcdefghij", 5); !strings.HasPrefix(got, "abcde") || !strings.Contains(got, "truncated") {
+		t.Errorf("trunc: %q", got)
+	}
+}