package guards

import (
	"strings"
	"testing"
)

// sealtestImport is the plaintext-gate test helper package. Its own doc
// comment already says this — "this package must never be imported from
// non-test code: doing so would drag the testing package into the
// production binary" — but until now that rested on the comment alone.
const sealtestImport = "amadan.net/oficina/sheets/internal/sheets/sealtest"

// TestSealtestOnlyImportedByTests fails on any non-_test.go file that
// imports sealtest.
func TestSealtestOnlyImportedByTests(t *testing.T) {
	root := repoRoot(t)
	for _, path := range goFiles(t, root) {
		if strings.HasSuffix(path, "_test.go") {
			continue
		}
		rel := relPath(t, root, path)
		for _, imp := range fileImports(t, path) {
			if imp == sealtestImport {
				t.Errorf("%s: imports %q from non-test code (sealtest containment: sealtest imports testing, so it must stay test-only)", rel, sealtestImport)
			}
		}
	}
}