Add demo for diffing two commits

pkg/integration/tests/demo/diff_commits.go

@@ -0,0 +1,44 @@
+package demo
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var DiffCommits = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Diff two commits",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	IsDemo:       true,
+	SetupConfig: func(config *config.AppConfig) {
+		setDefaultDemoConfig(config)
+
+		config.UserConfig.Gui.ShowFileTree = false
+		config.UserConfig.Gui.ShowCommandLog = false
+	},
+	SetupRepo: func(shell *Shell) {
+		shell.CreateNCommitsWithRandomMessages(50)
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.SetCaptionPrefix("Compare two commits")
+		t.Wait(1000)
+
+		t.Views().Commits().
+			Focus().
+			NavigateToLine(Contains("Replace deprecated lifecycle methods in React components")).
+			Wait(1000).
+			Press(keys.Universal.DiffingMenu).
+			Tap(func() {
+				t.ExpectPopup().Menu().
+					Title(Equals("Diffing")).
+					TopLines(
+						MatchesRegexp(`Diff .*`),
+					).
+					Wait(500).
+					Confirm()
+			}).
+			NavigateToLine(Contains("Move constants to a separate config file")).
+			Wait(1000).
+			PressEnter()
+	},
+})