fixup! Allow to switch branches in Commit View

Add integration test

pkg/integration/tests/commit/checkout.go

@@ -0,0 +1,70 @@
+package commit
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var Checkout = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Checkout a commit as a detached head, or checkout an existing branch at a commit",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig:  func(config *config.AppConfig) {},
+	SetupRepo: func(shell *Shell) {
+		shell.EmptyCommit("one")
+		shell.EmptyCommit("two")
+		shell.NewBranch("branch1")
+		shell.NewBranch("branch2")
+		shell.EmptyCommit("three")
+		shell.EmptyCommit("four")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Commits().
+			Focus().
+			Lines(
+				Contains("four").IsSelected(),
+				Contains("three"),
+				Contains("two"),
+				Contains("one"),
+			).
+			PressPrimaryAction()
+
+		t.ExpectPopup().Menu().
+			Title(Contains("Checkout branch or commit")).
+			Lines(
+				Contains("Checkout commit as detached head").IsSelected(),
+				Contains("Checkout branch"),
+				Contains("Cancel"),
+			).
+			Select(Contains("Checkout branch")).
+			Tooltip(Contains("Disabled: No branches found at selected commit.")).
+			Select(Contains("Checkout commit as detached head")).
+			Confirm()
+		t.Views().Branches().Lines(
+			Contains("* (HEAD detached at"),
+			Contains("branch2"),
+			Contains("branch1"),
+			Contains("master"),
+		)
+
+		t.Views().Commits().
+			NavigateToLine(Contains("two")).
+			PressPrimaryAction()
+
+		t.ExpectPopup().Menu().
+			Title(Contains("Checkout branch or commit")).
+			Lines(
+				Contains("Checkout commit as detached head").IsSelected(),
+				Contains("Checkout branch").Contains("branch1"),
+				Contains("Checkout branch").Contains("master"),
+				Contains("Cancel"),
+			).
+			Select(Contains("Checkout branch").Contains("branch1")).
+			Confirm()
+		t.Views().Branches().Lines(
+			Contains("branch1"),
+			Contains("branch2"),
+			Contains("master"),
+		)
+	},
+})

pkg/integration/tests/test_list.go

@@ -84,6 +84,7 @@ var tests = []*components.IntegrationTest{
 	commit.AddCoAuthorWhileCommitting,
 	commit.Amend,
 	commit.AutoWrapMessage,
+	commit.Checkout,
 	commit.Commit,
 	commit.CommitMultiline,
 	commit.CommitSwitchToEditor,