Refactor class level DSL with macros to convert blocks to instance-scoped methods

spec/application_mode_spec.cr

@@ -8,6 +8,10 @@ private class MyApp < Kemal::Application
   get "/route2" do |env|
     "Route 2"
   end
+
+  get "/file" do |env|
+    send_file env, "Serdar".to_slice
+  end
 end
 
 describe MyApp do
@@ -24,4 +28,23 @@ describe MyApp do
       end
     end
   end
+
+  it "sends file with binary stream" do
+    request = HTTP::Request.new("GET", "/file")
+    response = call_request_on_app(MyApp.new, request)
+    response.status_code.should eq(200)
+    response.headers["Content-Type"].should eq("application/octet-stream")
+    response.headers["Content-Length"].should eq("6")
+  end
+
+  it "responds to delayed route" do
+    app = MyApp.new
+    app.setup
+    app.get "/delayed" do |env|
+      "Happy addition!"
+    end
+    request = HTTP::Request.new("GET", "/delayed")
+    client_response = call_request_on_app(app, request)
+    client_response.body.should eq("Happy addition!")
+  end
 end

spec/helpers_spec.cr

@@ -42,7 +42,7 @@ describe "Macros" do
       client_response.body.should eq("world")
 
       app.get "/breaking" do |env|
-        halt env, 404, "hello"
+        Kemal::Macros.halt env, 404, "hello"
         "world"
       end
       request = HTTP::Request.new("GET", "/breaking")
@@ -54,7 +54,7 @@ describe "Macros" do
     it "can break block with halt macro using default values" do
       app = Kemal::Base.new
       app.get "/" do |env|
-        halt env
+        Kemal::Macros.halt env
         "world"
       end
       request = HTTP::Request.new("GET", "/")
@@ -69,7 +69,7 @@ describe "Macros" do
       app = Kemal::Base.new
       app.get "/headers" do |env|
         env.response.headers.add "Content-Type", "image/png"
-        headers env, {
+        app.headers env, {
           "Access-Control-Allow-Origin" => "*",
           "Content-Type"                => "text/plain",
         }
@@ -85,7 +85,7 @@ describe "Macros" do
     it "sends file with given path and default mime-type" do
       app = Kemal::Base.new
       app.get "/" do |env|
-        send_file env, "./spec/asset/hello.ecr"
+        app.send_file env, "./spec/asset/hello.ecr"
       end
 
       request = HTTP::Request.new("GET", "/")
@@ -98,7 +98,7 @@ describe "Macros" do
     it "sends file with given path and given mime-type" do
       app = Kemal::Base.new
       app.get "/" do |env|
-        send_file env, "./spec/asset/hello.ecr", "image/jpeg"
+        app.send_file env, "./spec/asset/hello.ecr", "image/jpeg"
       end
 
       request = HTTP::Request.new("GET", "/")
@@ -111,7 +111,7 @@ describe "Macros" do
     it "sends file with binary stream" do
       app = Kemal::Base.new
       app.get "/" do |env|
-        send_file env, "Serdar".to_slice
+        app.send_file env, "Serdar".to_slice
       end
 
       request = HTTP::Request.new("GET", "/")