Add tests for running tests

tests/.gitignore

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+.bundle/
+bin/

tests/.rspec

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+--require spec_helper

tests/Gemfile

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+source 'https://rubygems.org'
+
+gem 'rspec', '~> 3'
+gem 'vimrunner', '~> 0.3'

tests/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    diff-lcs (1.3)
+    rspec (3.7.0)
+      rspec-core (~> 3.7.0)
+      rspec-expectations (~> 3.7.0)
+      rspec-mocks (~> 3.7.0)
+    rspec-core (3.7.1)
+      rspec-support (~> 3.7.0)
+    rspec-expectations (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-mocks (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-support (3.7.1)
+    vimrunner (0.3.4)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  rspec (~> 3)
+  vimrunner (~> 0.3)
+
+BUNDLED WITH
+   1.16.0

tests/README.md

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+# Tests #
+
+The motivation at the time of writing is to be able to refactor
+`lib/functions.vim` test running functions so that they can be extended. For example
+it would be nice to add python/pytest running without hacking in yet more code to this
+file.
+
+## Setup ##
+
+Currently the tests depend on [vimrunner](https://github.com/AndrewRadev/vimrunner)
+and have only been run against macvim. The reason for macvim is it has a reliable
+vim client server implementation that normal vim does not, at least not vim with
+xquartz on macos.
+
+### Install macvim ###
+
+    brew cask install macvim
+
+## Run tests ##
+
+    cd tests
+    bundle install
+    bundle exec rspec spec

tests/spec/functions.vim/run_tests_spec.rb

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+describe 'running tests with luan vim' do
+  before do
+    if vipe_file.exist?
+      vipe_file.delete
+    end
+  end
+
+  let(:vim_with_functions) {
+      vim.source("#{ENV['HOME']}/.vim/plugged/vipe/plugin/vipe.vim")
+      vim.source("#{ENV['HOME']}/.vim/lib/functions.vim")
+
+      dir, filename = test_path.split
+      vim.command("cd #{dir}")
+      vim.edit(filename)
+      vim
+  }
+
+  let(:vipe_file) {
+    Pathname.new('/tmp')
+      .join(".vipe_pipe_#{test_path.dirname.to_s.gsub('/', '_')}")
+  }
+
+  let(:last_command) {
+    vipe_file.readlines.last.chomp
+  }
+
+  let(:fixture_path) {
+      Pathname.new(ENV['HOME']).join(
+        '.vim',
+        'tests',
+        'spec',
+        'fixtures'
+      )
+  }
+
+  def run_test_file(vim)
+    vim.command('call RunTestFile()')
+  end
+
+  context 'editing an rspec file' do
+    let(:test_path) {
+      fixture_path.join(
+        'ruby',
+        'rspec_spec.rb'
+      )
+    }
+
+    it 'runs the rspec command' do
+      run_test_file(vim_with_functions)
+      expect(last_command).to eq('rspec --color rspec_spec.rb')
+    end
+  end
+
+  context 'editing an rspec file in a bundler environment' do
+    let(:test_path) {
+      fixture_path.join(
+        'ruby_with_bundler',
+        'rspec_spec.rb'
+      )
+    }
+
+    it 'runs the rspec command in the bundler environment' do
+      run_test_file(vim_with_functions)
+      expect(last_command).to eq('bundle exec rspec --color rspec_spec.rb')
+    end
+  end
+end

tests/spec/spec_helper.rb

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+require 'vimrunner'
+require 'vimrunner/rspec'
+
+# See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+RSpec.configure do |config|
+  config.expect_with :rspec do |expectations|
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  config.mock_with :rspec do |mocks|
+    mocks.verify_partial_doubles = true
+  end
+
+  config.shared_context_metadata_behavior = :apply_to_host_groups
+end
+
+Vimrunner::RSpec.configure do |config|
+  config.reuse_server = true
+  config.start_vim do
+    vim = Vimrunner.start_gvim
+    vim
+  end
+end