migrate open to branches with cli arg test

pkg/integration/tests/branch/open_with_cli_arg.go

@@ -0,0 +1,18 @@
+package branch
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var OpenWithCliArg = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Open straight to branches panel using a CLI arg",
+	ExtraCmdArgs: "branch",
+	Skip:         false,
+	SetupConfig:  func(config *config.AppConfig) {},
+	SetupRepo: func(shell *Shell) {
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Branches().IsFocused()
+	},
+})