Readd spec for #1067

spec/nanoc/regressions/gh_1067_spec.rb

@@ -0,0 +1,34 @@
+describe 'GH-1067', site: true, stdio: true do
+  before do
+    File.write('nanoc.yaml', <<EOS)
+environments:
+  default:
+    build: dev
+  prod:
+    build: prod
+EOS
+
+    File.write('content/foo.erb', 'build=<%= @config[:build] %>')
+
+    File.write('Rules', <<EOS)
+  compile '/*' do
+    filter :erb
+    write item.identifier
+  end
+EOS
+  end
+
+  it 'recompiles when env changes' do
+    ENV['NANOC_ENV'] = nil
+    Nanoc::CLI.run(%w(compile))
+    expect(File.read('output/foo.erb')).to eql('build=dev')
+
+    ENV['NANOC_ENV'] = nil
+    Nanoc::CLI.run(%w(compile -e prod))
+    expect(File.read('output/foo.erb')).to eql('build=prod')
+
+    ENV['NANOC_ENV'] = nil
+    Nanoc::CLI.run(%w(compile))
+    expect(File.read('output/foo.erb')).to eql('build=dev')
+  end
+end