posts/config_test.go

package main

import (
	"os"
	"path/filepath"
	"testing"
)

func TestConfigFile(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "site.json")
	c := newConfigFile(path)

	steps := []struct {
		name, json string // json "" means delete the file
		want       string
	}{
		{"missing file", "", "Home"},
		{"value set", `{"homeText": "Start"}`, "Start"},
		{"field left out", `{}`, "Home"},
		{"blank value", `{"homeText": "  "}`, "Home"},
		{"set again", `{"homeText": "Posts"}`, "Posts"},
		{"broken JSON keeps last good", `{"homeText": `, "Posts"},
		{"unknown field keeps last good", `{"homeTxt": "Typo"}`, "Posts"},
		{"fixed", `{"homeText": "Index page"}`, "Index page"},
		{"deleted again", "", "Home"},
	}
	for _, s := range steps {
		if s.json == "" {
			os.Remove(path)
		} else if err := os.WriteFile(path, []byte(s.json), 0o644); err != nil {
			t.Fatal(err)
		}
		if got := c.Get().HomeText; got != s.want {
			t.Errorf("%s: HomeText = %q, want %q", s.name, got, s.want)
		}
	}
}