test(margin): add margin popup spec

Also had to change the help popup slightly: because columns are
calculated dynamically, adding an entry for the margin popup changed the
order of some of the existing entries.

Author: lucasadelino

spec/popups/help_popup_spec.rb

@@ -10,17 +10,17 @@
       " Commands                            Applying changes       Essential commands  ",
       " $ History          M Remote         <c-s> Stage all        <c-r> Refresh       ",
       " A Cherry Pick      m Merge          K Untrack              <cr> Go to file     ",
-      " b Branch           P Push           s Stage                <tab> Toggle        ",
-      " B Bisect           p Pull           S Stage unstaged                           ",
+      " b Branch           p Pull           s Stage                <tab> Toggle        ",
+      " B Bisect           P Push           S Stage unstaged                           ",
       " c Commit           Q Command        u Unstage                                  ",
       " d Diff             r Rebase         U Unstage all                              ",
       " f Fetch            t Tag            x Discard                                  ",
-      " I Init             v Revert                                                    ",
-      " i Ignore           w Worktree                                                  ",
-      " l Log              X Reset                                                     ",
-      "                    Z Stash                                                     "
+      " i Ignore           v Revert                                                    ",
+      " I Init             w Worktree                                                  ",
+      " L Margin           X Reset                                                     ",
+      " l Log              Z Stash                                                     "
     ]
   end
 
-  %w[$ A b B c d f i I l M m P p r t v w X Z].each { include_examples "interaction", _1 }
+  %w[$ A b B c d f i I l L M m P p r t v w X Z].each { include_examples "interaction", _1 }
 end

spec/popups/margin_popup_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+RSpec.describe "Margin Popup", :git, :nvim, :popup do # rubocop:disable RSpec/EmptyExampleGroup
+  before { nvim.keys("L") }
+
+  let(:view) do
+    [
+      " Arguments                                                                      ",
+      " -n Limit number of commits (--max-count=256)                                   ",
+      " -o Order commits by (--[topo|author-date|date]-order)                          ",
+      " -g Show graph (--graph)                                                        ",
+      " -c Show graph in color (--color)                                               ",
+      " -d Show refnames (--decorate)                                                  ",
+      "                                                                                ",
+      " Refresh       Margin                                                           ",
+      " g buffer      L toggle visibility                                              ",
+      "               l cycle style                                                    ",
+      "               d toggle details                                                 ",
+      "               x toggle shortstat                                               "
+    ]
+  end
+
+  %w[L l d].each { include_examples "interaction", _1 }
+end