Add integration tests for checkout/new branch with autostash

pkg/integration/tests/branch/checkout_autostash.go

@@ -0,0 +1,54 @@
+package branch
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var CheckoutAutostash = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Check out a branch that requires performing autostash",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig:  func(config *config.AppConfig) {},
+	SetupRepo: func(shell *Shell) {
+		shell.CreateFileAndAdd("file", "a\n\nb")
+		shell.Commit("add file")
+		shell.UpdateFileAndAdd("file", "a\n\nc")
+		shell.Commit("edit last line")
+
+		shell.Checkout("HEAD^")
+		shell.UpdateFile("file", "b\n\nb")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Files().
+			Lines(
+				Contains("file"),
+			)
+
+		t.Views().Branches().
+			Focus().
+			Lines(
+				MatchesRegexp(`\*.*HEAD`).IsSelected(),
+				Contains("master"),
+			).
+			NavigateToLine(Contains("master")).
+			PressPrimaryAction()
+
+		t.ExpectPopup().Confirmation().
+			Title(Contains("Autostash?")).
+			Content(Contains("You must stash and pop your changes to bring them across. Do this automatically? (enter/esc)")).
+			Confirm()
+
+		t.Views().Branches().
+			Lines(
+				Contains("master").IsSelected(),
+			)
+
+		t.Git().CurrentBranchName("master")
+
+		t.Views().Files().
+			Lines(
+				Contains("file"),
+			)
+	},
+})