added tests for config

config_test.go

@@ -0,0 +1,138 @@
+package main
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func writeConfigFile(t *testing.T, content string) string {
+	t.Helper()
+	dir := t.TempDir()
+	path := filepath.Join(dir, "config.toml")
+	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
+		t.Fatalf("failed write test config: %v", err)
+	}
+	return path
+}
+
+func TestReadConfig(t *testing.T) {
+	path := writeConfigFile(t, `
+cache_root = "srv/cache"
+mirror_urls = ["https://mirror.example.com"]
+mirrored_repos = ["core", "extra"]
+port = "8090"
+
+[auth]
+token = "testtoken"
+`)
+
+	cfg, err := ReadConfig(path)
+	if err != nil {
+		t.Fatalf("expected no err on read got: %v", err)
+	}
+	if cfg.Port != "8090" {
+		t.Errorf("expected port 8090 got %s", cfg.Port)
+	}
+}
+
+func TestMissingCacheRoot(t *testing.T) {
+	path := writeConfigFile(t, `
+mirror_urls = ["https://mirror.example.com"]
+mirrored_repos = ["core", "extra"]
+port = "8090"
+
+[auth]
+token = "testtoken"
+`)
+
+	_, err := ReadConfig(path)
+	if err == nil {
+		t.Fatal("expected err got nil")
+	}
+}
+
+func TestMissingMirrorUrls(t *testing.T) {
+	path := writeConfigFile(t, `
+cache_root = "srv/cache"
+mirrored_repos = ["core", "extra"]
+port = "8090"
+
+[auth]
+token = "testtoken"
+`)
+
+	_, err := ReadConfig(path)
+	if err == nil {
+		t.Fatal("expected err got nil")
+	}
+}
+
+func TestMissingMirroredRepos(t *testing.T) {
+	path := writeConfigFile(t, `
+cache_root = "srv/cache"
+mirror_urls = ["https://mirror.example.com"]
+port = "8090"
+
+[auth]
+token = "testtoken"
+`)
+
+	_, err := ReadConfig(path)
+	if err == nil {
+		t.Fatal("expected err got nil")
+	}
+}
+
+func TestMissingPort(t *testing.T) {
+	path := writeConfigFile(t, `
+cache_root = "srv/cache"
+mirror_urls = ["https://mirror.example.com"]
+mirrored_repos = ["core", "extra"]
+
+[auth]
+token = "testtoken"
+`)
+
+	_, err := ReadConfig(path)
+	if err == nil {
+		t.Fatal("expected err got nil")
+	}
+}
+
+func TestMissingAuthToken(t *testing.T) {
+	path := writeConfigFile(t, `
+cache_root = "srv/cache"
+mirror_urls = ["https://mirror.example.com"]
+mirrored_repos = ["core", "extra"]
+port = "8090"
+
+[auth]
+`)
+
+	_, err := ReadConfig(path)
+	if err == nil {
+		t.Fatal("expected err got nil")
+	}
+}
+
+func TestMissingFile(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "nonexistant.toml")
+
+	_, err := ReadConfig(path)
+	if !errors.Is(err, os.ErrNotExist) {
+		t.Fatal("expected err got nil")
+	}
+}
+
+func TestInvalidToml(t *testing.T) {
+	path := writeConfigFile(t, `
+cache_root = [srv/cache]
+`)
+
+	_, err := ReadConfig(path)
+	if err == nil {
+		t.Fatal("expected err got nil")
+	}
+}