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diff --git a/spec/heresy_spec.rb b/spec/heresy_spec.rb
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+# Tip of the hat to terryma/vim-multiple-cursors for this style
+# of testing Vim.
+require 'spec_helper'
+
+describe 'Basic editing' do
+  specify 'writing simple text' do
+    initial <<-EOF
+    EOF
+
+    type 'hello world'
+
+    final <<-EOF
+      hello world
+    EOF
+  end
+
+  specify '<Home> goes to first non-whitespace char' do
+    initial <<-EOF
+      justified
+         indented
+    EOF
+
+    type '<Down><End><Home>!'
+
+    final <<-EOF
+      justified
+         !indented
+    EOF
+  end
+
+  specify 'copy and paste' do
+    initial <<-EOF
+      copy me
+    EOF
+
+    type '<S-End><C-c><Esc><Space><C-v>'
+
+    final <<-EOF
+      copy me copy me
+    EOF
+  end
+
+  specify 'CTRL+ARROW jumps by word' do
+    initial <<-EOF
+      one two three four
+    EOF
+
+    type '<C-Right>X<C-Right>Y<C-Left>Z'
+
+    final <<-EOF
+      one Xtwo ZYthree four
+    EOF
+  end
+end
+
+describe 'Selecting' do
+  specify 'select all and replace' do
+    initial <<-EOF
+      select me
+    EOF
+
+    type '<C-a>gone'
+
+    final <<-EOF
+      gone
+    EOF
+  end
+
+  specify 'paste over selection' do
+    initial <<-EOF
+      cut me and paste over me
+    EOF
+
+    7.times { type '<S-Right>' }
+    type '<C-x>'
+    10.times { type '<Right>' }
+    7.times { type '<S-Right>' }
+    type '<C-v>'
+
+    final <<-EOF
+      and paste cut me
+    EOF
+  end
+
+  specify 'selecting from middle of line to end' do
+    initial <<-EOF
+      a line of text
+    EOF
+
+    6.times { type '<Right>' }
+    type '<S-End>'
+    type '!'
+
+    final <<-EOF
+      a line!
+    EOF
+  end
+
+  specify 'selecting from middle of line to beginning' do
+    initial <<-EOF
+      a line of text
+    EOF
+
+    7.times { type '<Right>' }
+    type '<S-Home>'
+    type '!'
+
+    final <<-EOF
+      !of text
+    EOF
+  end
+
+  specify 'CTRL+D selects the word under the cursor' do
+    initial <<-EOF
+      a line of text
+    EOF
+
+    4.times { type '<Right>' }
+    type '<C-D>X'
+
+    final <<-EOF
+      a X of text
+    EOF
+  end
+end
+
+describe 'Home/End behaviour for long, non-wrapped code lines' do
+  before(:each) do
+    # We need a small screen so that lines go off the edge of it.
+    @vim_options = [
+      # A single buffer can't be resized, so create a split of the buffer
+      'vsplit',
+      'vertical resize 6'
+    ]
+  end
+
+  specify 'HOME/END move to start/end of line off-screen' do
+    initial <<-EOF
+      line line line line
+    EOF
+
+    type '<End>X<Home>Y'
+
+    final <<-EOF
+      Yline line line lineX
+    EOF
+  end
+
+  specify 'SHIFT+END selects line, even if off-screen' do
+    initial <<-EOF
+      line line line line!
+    EOF
+
+    type '<S-End><S-Left>x'
+
+    final <<-EOF
+      x!
+    EOF
+  end
+
+  specify 'SHIFT+HOME selects line, even if off-screen' do
+    initial <<-EOF
+      !line line line line
+    EOF
+
+    type '<End><S-Home><S-Right>x'
+
+    final <<-EOF
+      !x
+    EOF
+  end
+end
+
+describe 'Wrapped text' do
+  before(:each) do
+    @vim_options = [
+      # A single buffer can't be resized, so create a split of the buffer
+      'vsplit',
+      'vertical resize 6'
+    ]
+    use_extension 'txt'
+  end
+
+  specify 'move up/down one wrapped line' do
+    initial <<-EOF
+      line line line line
+    EOF
+
+    type '<Down><Down>down '
+    type '<Up>up '
+
+    final <<-EOF
+      line line up down line line
+    EOF
+  end
+
+  specify 'select wrapped line below' do
+    initial <<-EOF
+      line1 line2 line3 line4
+    EOF
+
+    type '<Down><S-Down><S-Down>'
+    type '!'
+
+    final <<-EOF
+      line1 !line3 line4
+    EOF
+  end
+
+  specify 'select wrapped line above' do
+    initial <<-EOF
+      line1 line2 line3 line4
+    EOF
+
+    type '<Down><Down><S-Up><S-Up>'
+    type '!'
+
+    final <<-EOF
+      line1 !line3 line4
+    EOF
+  end
+
+  specify '<End> goes to end of wrapped line' do
+    initial <<-EOF
+      line line line line
+    EOF
+
+    type '<End>!'
+
+    final <<-EOF
+      line! line line line
+    EOF
+  end
+
+  specify '<Home> goes to beginning of wrapped line' do
+    initial <<-EOF
+      line line line line
+    EOF
+
+    type '<Down><Home>!'
+
+    final <<-EOF
+      line !line line line
+    EOF
+  end
+end
+
+describe 'Pane control' do
+  specify 'moving to another pane' do
+    # Open Quickfix window (auto focuses to it)
+    type '<M-;>:copen<CR>'
+    pane_type = vim.command 'echo &buftype'
+    expect(pane_type).to eq 'quickfix'
+
+    # Focus back to file
+    type '<M-Up>'
+    pane_type = vim.command 'echo &buftype'
+
+    expect(pane_type).to eq ''
+  end
+
+  specify 'closing a pane' do
+    # Open Netrw file manager in a sidebar
+    type '<M-;>Vexplore<CR>'
+    buffer_id = vim.command "echo bufnr('%')"
+    expect(buffer_id).to eq '2'
+
+    # Close Netrw pane
+    type '<C-w>'
+    buffer_id = vim.command "echo bufnr('%')"
+    expect(buffer_id).to eq '1'
+  end
+end