Add test for rewording a commit and failing with an error

The point of this test is to verify that the <--- YOU ARE HERE --- display is
correct when the last command in a rebase was "reword".

pkg/integration/tests/interactive_rebase/reword_commit_with_editor_and_fail.go

@@ -0,0 +1,45 @@
+package interactive_rebase
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var RewordCommitWithEditorAndFail = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Rewords a commit with editor, and fails because an empty commit message is given",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig: func(config *config.AppConfig) {
+	},
+	SetupRepo: func(shell *Shell) {
+		shell.
+			CreateNCommits(3).
+			SetConfig("core.editor", "sh -c 'echo </dev/null >.git/COMMIT_EDITMSG'")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Commits().
+			Focus().
+			Lines(
+				Contains("commit 03").IsSelected(),
+				Contains("commit 02"),
+				Contains("commit 01"),
+			).
+			NavigateToLine(Contains("commit 02")).
+			Press(keys.Commits.RenameCommitWithEditor).
+			Tap(func() {
+				t.ExpectPopup().Confirmation().
+					Title(Equals("Reword in editor")).
+					Content(Contains("Are you sure you want to reword this commit in your editor?")).
+					Confirm()
+			}).
+			Lines(
+				Contains("commit 03"),
+				Contains("<-- YOU ARE HERE --- commit 02").IsSelected(),
+				Contains("commit 01"),
+			)
+
+		t.ExpectPopup().Alert().
+			Title(Equals("Error")).
+			Content(Contains("exit status 1"))
+	},
+})

pkg/integration/tests/test_list.go

@@ -111,6 +111,7 @@ var tests = []*components.IntegrationTest{
 	interactive_rebase.MoveInRebase,
 	interactive_rebase.PickRescheduled,
 	interactive_rebase.Rebase,
+	interactive_rebase.RewordCommitWithEditorAndFail,
 	interactive_rebase.RewordFirstCommit,
 	interactive_rebase.RewordLastCommit,
 	interactive_rebase.RewordYouAreHereCommit,