Add demo for staging lines

pkg/integration/tests/demo/stage_lines.go

@@ -0,0 +1,85 @@
+package demo
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var originalFile = `# Lazygit
+
+Simple terminal UI for git commands
+
+![demo](https://user-images.gh.com/demo.gif)
+
+## Installation
+
+### Homebrew
+
+`
+
+var updatedFile = `# Lazygit
+
+Simple terminal UI for git
+(Not too simple though)
+
+![demo](https://user-images.gh.com/demo.gif)
+
+## Installation
+
+### Homebrew
+
+Just do brew install lazygit and bada bing bada
+boom you have begun on the path of laziness.
+
+`
+
+var StageLines = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Stage individual lines",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	IsDemo:       true,
+	SetupConfig: func(config *config.AppConfig) {
+		// No idea why I had to use version 2: it should be using my own computer's
+		// font and the one iterm uses is version 3.
+		config.UserConfig.Gui.NerdFontsVersion = "2"
+		config.UserConfig.Gui.ShowFileTree = false
+		config.UserConfig.Gui.ShowCommandLog = false
+	},
+	SetupRepo: func(shell *Shell) {
+		shell.NewBranch("docs-fix")
+		shell.CreateNCommitsWithRandomMessages(30)
+		shell.CreateFileAndAdd("docs/README.md", originalFile)
+		shell.Commit("Update docs/README")
+		shell.UpdateFile("docs/README.md", updatedFile)
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.SetCaptionPrefix("Stage individual lines")
+		t.Wait(1000)
+
+		t.Views().Files().
+			IsFocused().
+			PressEnter()
+
+		t.Views().Staging().
+			IsFocused().
+			Press(keys.Main.ToggleDragSelect).
+			PressFast(keys.Universal.NextItem).
+			PressFast(keys.Universal.NextItem).
+			Wait(500).
+			PressPrimaryAction().
+			Wait(500).
+			PressEscape()
+
+		t.Views().Files().
+			IsFocused().
+			Press(keys.Files.CommitChanges).
+			Tap(func() {
+				t.ExpectPopup().CommitMessagePanel().
+					Type("Update tagline").
+					Confirm()
+			})
+
+		t.Views().Commits().
+			Focus()
+	},
+})

pkg/integration/tests/test_list.go

@@ -96,6 +96,7 @@ var tests = []*components.IntegrationTest{
 	demo.Filter,
 	demo.InteractiveRebase,
 	demo.NukeWorkingTree,
+	demo.StageLines,
 	diff.Diff,
 	diff.DiffAndApplyPatch,
 	diff.DiffCommits,