Implement Phase 4 test coverage

internal/backup/backup_test.go

@@ -0,0 +1,74 @@
+package backup
+
+import (
+	"os"
+	"path/filepath"
+	"reflect"
+	"runtime"
+	"testing"
+)
+
+func TestMySQLCLIArgsTCP(t *testing.T) {
+	args, db, err := MySQLCLIArgs("user:pass@tcp(127.0.0.1:3307)/gitocean_test?parseTime=true")
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []string{"-uuser", "-ppass", "-h127.0.0.1", "-P3307"}
+	if !reflect.DeepEqual(args, want) || db != "gitocean_test" {
+		t.Fatalf("args=%#v db=%q, want %#v %q", args, db, want, "gitocean_test")
+	}
+}
+
+func TestMySQLCLIArgsUnix(t *testing.T) {
+	args, db, err := MySQLCLIArgs("user@unix(/tmp/mysql.sock)/gitocean")
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []string{"-uuser", "--socket", "/tmp/mysql.sock"}
+	if !reflect.DeepEqual(args, want) || db != "gitocean" {
+		t.Fatalf("args=%#v db=%q, want %#v %q", args, db, want, "gitocean")
+	}
+}
+
+func TestMySQLCLIArgsInvalidDSN(t *testing.T) {
+	if _, _, err := MySQLCLIArgs("bad dsn"); err == nil {
+		t.Fatal("expected invalid DSN to fail")
+	}
+}
+
+func TestCopyDir(t *testing.T) {
+	src := t.TempDir()
+	dst := filepath.Join(t.TempDir(), "dst")
+	if err := os.MkdirAll(filepath.Join(src, "nested"), 0750); err != nil {
+		t.Fatal(err)
+	}
+	file := filepath.Join(src, "nested", "file.txt")
+	if err := os.WriteFile(file, []byte("hello"), 0640); err != nil {
+		t.Fatal(err)
+	}
+	if err := CopyDir(src, dst); err != nil {
+		t.Fatal(err)
+	}
+	got, err := os.ReadFile(filepath.Join(dst, "nested", "file.txt"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(got) != "hello" {
+		t.Fatalf("unexpected copied content: %q", got)
+	}
+	if runtime.GOOS != "windows" {
+		info, err := os.Stat(filepath.Join(dst, "nested", "file.txt"))
+		if err != nil {
+			t.Fatal(err)
+		}
+		if info.Mode().Perm() != 0640 {
+			t.Fatalf("mode = %v, want 0640", info.Mode().Perm())
+		}
+	}
+}
+
+func TestCopyDirMissingSource(t *testing.T) {
+	if err := CopyDir(filepath.Join(t.TempDir(), "missing"), filepath.Join(t.TempDir(), "dst")); err == nil {
+		t.Fatal("expected missing source to fail")
+	}
+}