Add specs

spec/init_handler_spec.cr

@@ -11,6 +11,17 @@ describe "Kemal::InitHandler" do
     context.response.headers["Content-Type"].should eq "text/html"
   end
 
+  it "initializes context with Date header" do
+    request = HTTP::Request.new("GET", "/")
+    io = IO::Memory.new
+    response = HTTP::Server::Response.new(io)
+    context = HTTP::Server::Context.new(request, response)
+    Kemal::InitHandler::INSTANCE.next = ->(_context : HTTP::Server::Context) {}
+    Kemal::InitHandler::INSTANCE.call(context)
+    date = context.response.headers["Date"]?.should_not be_nil
+    Time.parse_rfc2822(date).should be_close(Time.utc, 1.second)
+  end
+
   it "initializes context with X-Powered-By: Kemal" do
     request = HTTP::Request.new("GET", "/")
     io = IO::Memory.new