Allow setting a default name when creating new branches

pkg/integration/tests/commit/new_branch_with_prefix.go

@@ -0,0 +1,33 @@
+package commit
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var NewBranchWithPrefix = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Creating a new branch from a commit with a default name",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig: func(cfg *config.AppConfig) {
+		cfg.UserConfig.Git.BranchPrefix = "myprefix/"
+	},
+	SetupRepo: func(shell *Shell) {
+		shell.
+			EmptyCommit("commit 1")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Commits().
+			Focus().
+			Lines(
+				Contains("commit 1").IsSelected(),
+			).
+			SelectNextItem().
+			Press(keys.Universal.New).
+			Tap(func() {
+				branchName := "my-branch-name"
+				t.ExpectPopup().Prompt().Title(Contains("New branch name")).Type(branchName).Confirm()
+				t.Git().CurrentBranchName("myprefix/" + branchName)
+			})
+	},
+})