Revert "remove erubis test (let tilt handle this)"

This reverts commit 3ac8cb76da.

Oops. I meant to take this out after adding the development
dependencies. I still don't think it would be a bad idea to remove
the template-engine specific tests from Sinatra, but I think
we should do it across all engines, not just erubis.

test/erubis_test.rb

@@ -0,0 +1,82 @@
+require File.dirname(__FILE__) + '/helper'
+require 'erubis'
+
+class ERubisTest < Test::Unit::TestCase
+  def erubis_app(&block)
+    mock_app {
+      set :views, File.dirname(__FILE__) + '/views'
+      get '/', &block
+    }
+    get '/'
+  end
+
+  it 'renders inline ERubis strings' do
+    erubis_app { erubis '<%= 1 + 1 %>' }
+    assert ok?
+    assert_equal '2', body
+  end
+
+  it 'renders .erubis files in views path' do
+    erubis_app { erubis :hello }
+    assert ok?
+    assert_equal "Hello World\n", body
+  end
+
+  it 'takes a :locals option' do
+    erubis_app {
+      locals = {:foo => 'Bar'}
+      erubis '<%= foo %>', :locals => locals
+    }
+    assert ok?
+    assert_equal 'Bar', body
+  end
+
+  it "renders with inline layouts" do
+    mock_app {
+      layout { 'THIS. IS. <%= yield.upcase %>!' }
+      get('/') { erubis 'Sparta' }
+    }
+    get '/'
+    assert ok?
+    assert_equal 'THIS. IS. SPARTA!', body
+  end
+
+  it "renders with file layouts" do
+    erubis_app {
+      erubis 'Hello World', :layout => :layout2
+    }
+    assert ok?
+    assert_equal "ERubis Layout!\nHello World\n", body
+  end
+
+  it "renders erubis with blocks" do
+    mock_app {
+      def container
+        @_out_buf << "THIS."
+        yield
+        @_out_buf << "SPARTA!"
+      end
+      def is; "IS." end
+      get '/' do
+        erubis '<% container do %> <%= is %> <% end %>'
+      end
+    }
+    get '/'
+    assert ok?
+    assert_equal 'THIS. IS. SPARTA!', body
+  end
+
+  it "can be used in a nested fashion for partials and whatnot" do
+    mock_app {
+      template(:inner) { "<inner><%= 'hi' %></inner>" }
+      template(:outer) { "<outer><%= erubis :inner %></outer>" }
+      get '/' do
+        erubis :outer
+      end
+    }
+
+    get '/'
+    assert ok?
+    assert_equal '<outer><inner>hi</inner></outer>', body
+  end
+end